| Date | Panel | Item | Activity | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| COVID-19 research v1.69 | DOCK8 | Sarah Leigh Phenotypes for gene: DOCK8 were changed from Combined immunodeficiency; Hyper-IgE recurrent infection syndrome, autosomal recessive; Hyper IgE syndrome (HIES); Immunodeficiencies affecting cellular and humoral immunity; Low NK cells with poor function, eosinophilia, recurrent infections, cutaneous viral, fungal and staphylococcal infections, severe atopy, cancer diathesis; Hyper-IgE recurrent infection syndrome; impaired T cell function, Atopy, cutaneous viral infections to Hyper-IgE recurrent infection syndrome, autosomal recessive 243700; Combined immunodeficiency; Hyper-IgE recurrent infection syndrome, autosomal recessive; Hyper IgE syndrome (HIES); Immunodeficiencies affecting cellular and humoral immunity; Low NK cells with poor function, eosinophilia, recurrent infections, cutaneous viral, fungal and staphylococcal infections, severe atopy, cancer diathesis; Hyper-IgE recurrent infection syndrome; impaired T cell function, Atopy, cutaneous viral infections | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.349 | HDAC6 |
Rebecca Foulger commented on gene: HDAC6: Evidence Summary from Illumina curation team (Alison Coffey and Julie Taylor): Histone deacetylase 6 (HDAC6) is a unique cytoplasmic deacetylase that regulates various important biological processes by preventing protein aggregation and deacetylating different non-histone substrates. Growing evidence has indicated a dual role for HDAC6 in viral infection and pathogenesis: HDAC6 may represent a host defence mechanism against viral infection by modulating microtubule acetylation, triggering antiviral immune response and stimulating protective autophagy, or it may be hijacked by the virus to enhance proinflammatory response (Zheng et al, 2017). HDAC6 promotes the aggresome/autophagic degradation of the viral polyprotein Pr55Gag to inhibit HIV-1 production and infection (Hernández et al, 2019). Depletion of HDAC6 expression (in vitro) led to impaired antiviral responses against RNA viruses, but not against DNA viruses. HDAC6 knockout mice were highly susceptible to RNA virus infections compared to wildtype mice (Choi et al, 2016). Overexpression of Hdac6 enhances resistance to virus infection in embryonic stem cells and in mice (Wang et al, 2015). Literature: PMID: 27959772 - Zheng et al. (2017) (Review) This review highlights current data illustrating the complexity and importance of HDAC6 in viral pathogenesis. HDAC6 has both proviral and antiviral effects. HDAC6 can inhibit infection of both RNA and DNA virus by modulating microtubule (MT) cytoskeleton and stimulating selective autophagy and restrict viral diffusion by triggering antiviral immune response. However, RNA viruses can also utilize HDAC6-mediated aggresome pathway or proinflammatory response to facilitate viral pathogenesis (Fig 1 and Table 1) • HDAC6 triggers antiviral gene expression upon RNA virus infection (Fig 3a) • HDAC6 interacts with Vif or A3G and competes for Vif–A3G interaction through its BUZ domain, impairs the incorporation of Vif into nascent virions and finally controls HIV-1 infectiveness (Fig 4) • HDAC6 facilitates viral uncoating and pathogenesis (Fig 5) Findings support exploration of a potential therapeutic role for restricting viral pathogenesis by targeting HDAC6. PMID: 31736889: Hernández et al. (2019) - HIV Nef is a central auxiliary protein in HIV infection and pathogenesis. Results from the study indicate that HDAC6 promotes the aggresome/autophagic degradation of the viral polyprotein Pr55Gag to inhibit HIV-1 production • HIV-1 Nef viral protein induces HDAC6 Degradation (Enzyme degradation by recombinant HIV-1 Nef in HEK-293T cells in both endogenous and over expressed HDAC6 is shown in Fig 1) • Mutated Nef protein Nef-PPAA did not promote HDAC6 degradation (Figure 3A, quantified in Figure 3B). This fact may indicate that this motif is involved in Nef-mediated HDAC6 interaction and/or processing, or that a conformational change in the mutated viral protein abrogates the degradative activity observed with the wt-Nef (Figures 1–3) • Nef assures viral production and infection by targeting HDAC6, stabilizing Pr55Gag and Vif, thereby facilitating Pr55Gag location and aggregation at plasma membrane, and subsequent virus production and infection capacity (events summarized by schematic illustrations in Figure 10) PMID: 26746851: Choi et al. (2016) - HDAC6 plays an important role in the antiviral immune response by producing IFNs and proinflammatory cytokines in responses to foreign RNA viruses. HDAC6+/+ and HDAC6-/- mice were intravenously infected with vesicular stomatitis virus (VSV, Indiana strain). Results show that • HDAC6-/- mice are more susceptible to VSV-Indiana infection than HDAC6+/+ mice and showed significantly decreased survival rate (Fig 1A) • Virus titers were significantly higher and IFN-b and IL-6 production was markedly lower in HDAC6-/- mice than in HDAC6+/+ mice (Fig 1D and E) • Role of HDAC6 in cytokine induction by poly(I:C), which is a synthetic double-stranded RNA (dsRNA): Intravenous injection of poly(I:C) caused the rapid and robust induction of IFN-b and IL-6 in HDAC6+/+ mice; however, induction of these cytokines was significantly reduced in HDAC6-/-mice (Fig 1F). In vitro • HDAC6 deficiency reduces the innate immune response on mouse macrophage and mouse embryonic fibroblast (Fig 3) • HDAC6 and RIG-I transiently interact in response to RNA viral infection (Fig 5A and B) and HDAC6 regulates the binding of RIG-I to 50 pppdsRNA by deacetylating RIG-I (Fig 5G) PMID: 25482409 Wang et al. (2015) - This is another study that provides a proof of principle of antivirus function by Hdac6 in vivo. HDAC6 overexpression significantly enhances resistance to avian H5N1 virus infection and extends the survival rate in Hdac6tg mice (transgenic) (Fig 2). Also, ES cells overexpressing Hdac6 displayed resistance to infection by adenovirus at high titers (Fig 1). |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.349 | BECN1 |
Rebecca Foulger commented on gene: BECN1: Evidence Summary from Illumina curation team (Alison Coffey and Julie Taylor): BECN1 encodes the beclin1 protein which is an established regulator of the autophagic pathway. Autophagy is a key mechanism against invading bacteria, parasites, and viruses in innate immune cells including monocytes/macrophages, dendritic cells and neutrophils (reviewed in Tao et al. 2020). Viral proteins such as HIV-1 Nef, ICP34.5 of HSV-1 and M11 of MHV-68 have been shown to interact with Beclin-1 and block the late stage of autophagy, thereby protecting viral particles from degradation (Kyei et al 2009; Orvedahl et al. (2007); Ku et al. (2008) PMID:32265919 Tao et al. 2020 (review) - Autophagy is a key mechanism against invading bacteria, parasites, and viruses in innate immune cells including monocytes/macrophages, dendritic cells (conventional dendritic cells-cDCs and plasmacytoid dendritic cells-pDCs) and neutrophils. BECN1 encodes beclin1 protein which is an established regulator of the autophagic pathway. Viral proteins may target BECN1 to inhibit autophagy. PMID: 19635843 Kyei et al. (2009) - A series of experiments showed that the Nef protein of HIV inhibits the autophagic maturation pathway (fig 5). Macrophages transfected with Nef-GFP showed colocalization of Nef with Beclin-1 and the two proteins were shown to physically interact in immunoprecipitation experiments (Fig6). PMID: 18248095 Ku et al. (2008) - In NIH3T3 cell culture studies, the M11, a viral BCL-2 of murine gamma herpesvirus 68 was shown to bind Beclin-1 and to inhibit to inhibit Beclin-1 mediated autophagy (Fig 4). PMID: 18005679 Orvedahl et al. (2007) - The authors used coimmunoprecipitation experiments in both HEK293 cells and embryonic stem cells to show that the neurovirulence protein of Herpes simplex virus (HSV)-1, ICP34.5, binds to the C terminus of BECN1 (Fig 2). In MCF7 stably expressing BECN1cells, transfection of the ICP34.5 inhibited autophagy (Fig 2). Mutant HSV-1 lacking the ICP34.5 BECN1-binding domain failed to inhibit autophagy in primary sympathetic neurons (Fig 5A) and had impaired ability to cause lethal encephalitis in mice (Fig 6) . |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.349 | RNASEL |
Rebecca Foulger commented on gene: RNASEL: Evidence Summary from Illumina curation team (Alison Coffey and Julie Taylor): RNASEL, also known as 2-5A-dependent RNase is a component of the interferon-regulated 2-5A system that functions in the antiviral interferon pathway. Treatment of cells with interferon results in enhanced levels of both 2-5A-dependent RNase and a group of synthetases that produce 5-prime-triphosphorylated, 2-prime,5-prime-oligoadenylates (2-5A) from ATP. The role of the 2-5A system in the control of viral and cellular growth suggests that defects in the 2-5A-dependent RNase gene could result in reduced immunity to virus infections and cancer (Hassel et al., 1993). Several studies aiming to identify a genetic association between RNASEL and viral susceptibility have failed to identified statistically significant SNPs (Yakub et al. 2005; Arredondo et al. 2012). However, there is sufficient experimental evidence, including a mouse model and in-vitro studies that RNASEL is an important contributor in host defence against several viruses (Gusho et al. 2016 (review); Zhou et al. 1997; Panda et al. 2019). PMID 27595182: Gusho et al. 2016 (review) - RNase L is a unique IFN-regulated endoribonuclease that serves as an important mediator of antiviral innate immunity with possible roles in antibacterial defense and prostate cancer. It is controlled by IFN-inducible oligo-adenylate synthetases (OASs) and double-stranded RNAs (dsRNAs). OAS-RNase L (Fig. 1) pathway, discovered in the mid-1970s, was one of the first IFN-dependent antiviral pathways to be characterized. OASs are IFN-I/-III-inducible genes that are expressed at very low basal levels in many cell types. OASs1-3 act as pathogen recognition receptors that sense dsRNAs and activate the synthesis of 5’-phosphorylated 2’-5’ linked oligoadenylates from ATP (2-5A). 2-5A acts as a second messenger and binds monomeric RNase L, and activates its dimer formation. Active RNase L cleaves cellular and viral RNAs within single-stranded regions. RNA degradation directly and indirectly activates subsequent events, including the elimination of viral genomes, inhibition of cellular and viral protein synthesis; and activation of several cellular signaling pathways, including those involved in autophagy, apoptosis, senescence, IFN-b production, and NLRP3-inflammasome activation as part of its antiviral mechanism (references provided). Authors state that many viruses have evolved or acquired strategies that antagonize the OAS-RNase L pathway to evade antiviral innate immunity. Some, such as Influenza A (IAV), HSV and Vaccinia virus act through an RNA-binding domain which binds to and sequesters dsRNA, the activator of OAS. Others bind directly to monomeric RNase L preventing it from activation by dimerization. Some coronaviruses (MERS-CoV and MHV) are described to act through their ns-domains with 2’-5’ PDE activity that degrades 2-5A and thus prevent activation of RNase L. Some additional evidence of interest: -OAS3 was shown to exert antiviral activity against Dengue virus in an RNase L-dependent manner, indicating that OAS3 synthesizes active 2-5A in sufficient amounts for RNase L activation -RNase L activation by dsRNA signaling or viral infection contributes to IFN-b production, indicating its important role in innate immunity. The ribonuclease function of RNase L is essential for its effect on IFN-b production -Moreover, mice deficient in RNase L had several-fold reduced levels of IFN-b induction after infection with RNA viruses (EMCV and Sendai virus) -Stable expression of wild-type human full-length RNase L, but not ribonuclease dead mutant (R667A), activates IL-1b and caspase 1 secretion in RNase L-deficient THP1 cells after virus infection or 2-5A transfection PMID 9351818: Zhou et al. (1997) RNASEL Mouse model To determine the physiological roles of the 2-5A system, mice were generated with a targeted disruption of the RNase L gene. The antiviral effect of interferon was impaired in RNaseL–/– mice providing the first evidence that the 2-5A system functions as an antiviral pathway in animals. Authors showed that EMCV replicates more efficiently in cells lacking RNase L than in wild type cells, even after interferon treatment, although the effect is relatively small. Next, authors determined that survival of RNaseL-/- mice after EMCV infection was significantly reduced both in presence and absence of IF (Fig 3). Enlarged thymus and reduced level of apoptosis in thymus and spleen were also found (Fig 4-5). PMID 31156620 Panda et al (2019) Interferon regulatory factor-1 (IRF1) regulates expression of RNaseL and knockdown of RNaseL in BEAS-2B cells resulted in significantly increased VSV infection rates. (Fig.6) PMID 22356654 Arredondo et al. 2012 Authors studied allelic variants in RNASEL gene at codon 462 (R462Q, rs486907) for susceptibility to viral infection, prostate cancer and chronic fatigue syndrome. The allelic distribution at codon 462 was 139 (33.9%), 204 (49.8%), and 67 (16.3%) for RR, RQ, and QQ, respectively, in 410 individuals in Spain. There were no significant differences comparing 105 blood donors and 71 patients with HIV-1 infection, 27 with chronic hepatitis C, 67 with prostate cancer, and 107 with chronic fatigue syndrome. In contrast, two-thirds of 18 patients with HTLV-1 infection and 15 with chronic hepatitis B harbored RR (Table 1). Thus, polymorphisms at the RNASEL gene do not seem to influence the susceptibility to common viral infections or conditions potentially of viral etiology. They conclude that the role in influencing the susceptibility to HTLV-1 or HBV chronic infection warrants further examination in larger patient populations. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.348 | NECTIN1 |
Rebecca Foulger commented on gene: NECTIN1: Evidence Summary from Illumina curation team (Alison Coffey and Julie Taylor): Amino acid substitutions in nectin-1 showed impaired entry of Herpes simplex virus (HSV) into CHO-K1 cells (PMID:1175687;12072525). Nectin-1 knockout mice inoculated with HSV in the hippocampus demonstrated that nectin-1 is necessary for neurologic disease caused by HSV (PMID:19805039). PMID 11756979 - Struyf et al. (2002) - Searched for polymorphisms in HVEM, nectin-1, and nectin-2 via sequencing in individuals shown to immune seronegative for herpes simplex virus (HSV). These individuals showed T cell responses to HSV antigens and did not have anti-HSV antibodies detected in their serum. There were three individuals that were immune seronegative, three with no signs of cellular or humoral immunity, and three with frequent reactivations of HSV who had antibody and T cell responses to HSV. One individual in the study (true seronegative as demonstrated by negative testing for HSV-1 and HSV-2 and no HSV-specific T cell immunity) was identified to have a variant in nectin-1 (c.752G>A, p.Arg199Gln) in addition to one missense variant in HVEM (table 2). This variant was screened for 644 healthy White individuals and 17 were shown to be heterozygous for the p.Arg199Gln variant and one individual had a different missense variant at the same residue. The p.Arg199Gln variant occurs in the first constant-like domain for the protein. A different domain, the N-terminal variable-like domain, has previously been shown as important for virus entry into the cell. PMID 12072525 - Martinez and Spear (2002) - Investigated whether residues 75-77 and 85 of nectin-1 (homologous to regions A and B of nectin-2) are necessary for HSV-1 entry into CHO-K1 cells (which are resistant to the entry of alphaherpesviruses unless they are created to express a gD receptor). When there were mutants involving both residues 77 and 85, there was severely diminished ability of HSV-1 or HSV-2 to enter the cell and was unable to find to soluble forms of HSV-1 and HSV-2 (table 1; fig. 3). Note that these mutants allowed entry of PRV and BHV-1. PMID 19805039 - Kopp et al. (2009) - Nectin-1 knockout (KO) mice were inoculated intracranially and into the hippocampus with herpes simplex virus (HSV) and infection of neurons compared to HVEM KO mice, HVEM/nectin-1 KO mice, and controls. Nectin-1 KO mice were resistant to disease, as were the double KO mice at doses of the virus up to 100x needed to cause disease as compared to the wildtype and HVEM KO mice (Fig. 1). Nectin-1 is necessary for neurologic disease caused by HSV. Viral antigen was not detected in brain sections from double KO mice, but could be detected for nectin-1 KO mice (limited regions), HVEM-KO mice and wildtype (more widespread) (Fig. 2A). HSV was shown to be located to the ventricular surfaces in nectin-1 KO mice and confirmed as non-parenchymal cells (Fig. 2B). |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.348 | MIR155 |
Rebecca Foulger commented on gene: MIR155: Evidence Summary from Illumina curation team (Alison Coffey and Julie Taylor): MIR155 (also referred to as BIC) is an endogenous noncoding RNA involved in regulation of the immune response, in particular T-cell differentiation, and in regulation of innate immunity (PMID: 32233818; 217121651;1746328969;20852130). This miRNA has been associated with various virus infections (PMID: 32233818;28139244;23686237;26072128). miR-155-5p expression has been shown to be induced in mice infected with influenza A virus (PMID: 32308197 - in this study, lung injury by ARDS was attenuated by deletion of miR-155, making this miRNA a potential therapeutic target in the context of COVID-19). Through single cell and bulk RNA profiling of SARS-CoV-2 and SARS-CoV infections in three human cell lines (H1299, Caco-2 and Calu-3 cells), Emanuel et al. (2020) (bioRxiv preprint doi: https://doi.org/10.1101/2020.05.05.079194) demonstrated strong expression of the immunity and inflammation-associated microRNA miRNA-155 upon viral infection with both viruses. Both viruses triggered a 16-fold upregulation of one form of miR-155 and a 3-fold upregulation of another. A role for MIR155 in viral susceptibility for a range of viruses and the immune response has also been demonstrated in a series of mouse models: PMID 23601686: In Mir155 -/- mice, Dudda et al. (2013) observed severely reduced accumulation of Cd8-positive T cells during acute and chronic viral infections with impaired control of viral replication. Lack of Mir155 led to an accumulation of Socs1 resulting in defective cytokine signaling through Stat5. Dudda et al. also concluded that MIR155 and its target, SOCS1, are key regulators of CD8-positive T cells. PMID 23275599: Lind et al. (2013) found that mice lacking Mir155 had impaired Cd8 positive T-cell responses to infections with lymphocytic choriomeningitis virus and the intracellular bacteria Listeria monocytogenes and concluded that MIR155 is required for acute CD8-positive T-cell responses and proposed that targeting MIR155 may be useful in modulating immune responses. PMID 24516198: Bhela et al. (2014) – 75 to 80% of MIR155 null mice infected ocularly with herpes simplex virus (HSV)-1 developed herpes simplex encephalitis with elevated viral titers in brain, but not in cornea. Immunohistochemical and flow cytometric analyses in Mir155-null mice showed diminished Cd8-positive T-cell numbers, functionality, and homing capacity. Adoptive transfer of HSV-1-immune Cd8-positive T cells to Mir155-null mice 24 hours after infection provided protection from HSE. The authors concluded that MIR155 deficiency results in enhanced susceptibility of the nervous system to HSV-1 infection. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.348 | DICER1 |
Rebecca Foulger changed review comment from: Evidence Summary from Illumina curation team: The DICER1 gene, located on chromosome 14, position q32.13, was discovered in 2001 by Bernstein and is a member of the RNase III family, (also known as dicer 1, ribonuclease III; dicer1, Dcr-1 homolog (Drosophila); multinodular goitre 1). DICER1 is involved in the generation of double-stranded microRNAs (miRNAs), short non-coding RNAs, the cleavage of dsRNA into siRNAs, along with the biogenesis of numerous other small RNAs. There is increasing evidence DICER1 is also involved in regulating many other essential cellular processes such as those related to chromatin remodeling, inflammation, apoptosis and cell survival (Kurzynska-Kokorniak et al. 2015; Song and Rossi, 2017). DICER1 encodes a ∼220-KDa protein (RNase III endoribonuclease) which is a crucial component of the RNA Induced Silencing Complex (RISC) loading complex (RLC), comprised of dicer, Argonaute-2 (AGO-2), and trans-activation-responsive RNA binding protein 2 (TARBP2). The encoded protein is required by the RNA interference (RNAi) and small temporal RNA (stRNA) pathways to produce the active small RNA component which has a role in modulating gene expression at the post-transcriptional level. Research has shown that expression levels of cellular transcript and protein dicer are strictly controlled, with aberrant regulation contributing to carcinogenesis, neurodegenerative, rheumatic and immune system disorders. Studies have concluded that the encoded dicer ribonuclease-dependent processing of dsRNA viral replication intermediates into successive siRNAs is a conserved mammalian immune response to infection by positive-strand RNA viruses (Svobodova et al. 2016 summary & fig1; Li et al. 2013; Ding et al. 2018). Moreover, miRNAs play an important role in host-virus interactions in mammals (See Maillard et al. 2019 REVIEW; Foulkes et al. 2014 REVIEW). IMMUNE SYSTEM The cre-lox method for dicer1 gene knockout has been employed for studies into the role of dicer1 in immune cell development and function. Studies of dicer1 fl/fl mice have indicated short survival times along with severely impaired GMP differentiation into monocytes, neutrophils, myeloid DCs & mature macrophages. (Devasthanam et al. 2014). Results conclude that dicer1 is important in immune response and also vital for cell survival and apoptosis pathways. Muljo et al. (2005) investigated a conditional allele of dicer-1 (dcr-1) within a mouse model and showed that specific dcr-1 deletion in the T-cell lineage, resulted in impaired development of T-cells & aberrant cell differentiation of T-helper cells & cytokine production. Dcr-1 deletion in the thymus resulted in severe block in development of CD8+ T cells and resulted in defective microRNA processing in CD4+ T-cells. The results demonstrate Dicer regulates diverse aspects of T-cell biology along with cytokine production during T-cell differentiation where dicer-deficient T-cells preferentially express interferon-ƴ. VIRUSES Research by Galiana-Arnoux et al. (2006), of DICER in drosophila (drosophila have two dicer genes) have identified that DICER genes (Dcr1, miRNA pathway and Dcr2, RNAi pathway) control production of siRNA and a loss-of-function mutation in Dcr2 resulted in increased susceptibility to three different families of RNA viruses. Qi et al. (2012) research into RNAi gene silencing mechanism show that the B2 protein in Wuhan nodavirus (WhNV) suppresses Dcr2 in drosophila by direct interaction with the PAZ and RNAse III domains therefore blocking processing of dsRNA and siRNA. Evidence of a dicer antiviral system was also reported by Machitani et al. (2016) for mammalian human adenoviruses where DICER1 gene knockdown increased the copy number of adenovirus-encoding small RNAs (VA-RNAs) leading to the promotion of adenovirus replication; conversely, dicer overexpression significantly inhibited viral replication. Modai et al. (2019) conclude that HIV-1 infection inhibits DICER1 by altering miRNA expression. They conclude that upon HIV-1 infection, human miR-186, 210 and 222 directly regulate DICER1 gene expression causing down-regulation of the gene contributing to impaired cell-mediated immunity (fig6). Other methods of inhibition are from viral proteins, termed viral suppressors of RNA silencing, which interact and inhibit dicer ribonuclease activity in HIV-1 and hepatitis C infections. These viral proteins may mediate proteasomal degradation of endoribonuclease dicer through CRL4DCAF1 ubiquitin ligase complex (Klockow et al. 2013), interact directly via the core protein (Chen et al. 2008) or HIV-1 transactivation of transcription (Bennasser and Jeang, 2006). Through these methods they can block dicer interactions with TRBP2 or ADAR1, boost macrophage infection, and subsequently reduce the function of short hairpin RNAs (shRNAs) which thus inhibit RNA silencing. Ultimately these viruses, though various methods, supress the ability of dicer to process dsRNAs into siRNAs boosting viral infection and pathogenesis. Downregulation of DICER1 gene expression has additionally been found in cord blood of infants with severe respiratory syncytial virus (RSV), prior to RSV exposure, indicating this reduced expression may predispose newborns to RSV disease. Inchley et al. (2011) theorize that this occurs via disruption of leukocyte gene regulation of miRNA and direct anti-viral RNAi mechanisms. (Inchley et al. 2011 see section on “Dicer Gene Expression”). Otsuka et al. (2007) have shown using gene-trap methods to obtain viable dicer1 fl/fl mice where dicer1 deficiency caused impairment of miR24 and miR93 production resulting in susceptibility to vesticular stomatitis virus (VSV) and herpes simplex-1 virus, but not other viruses tested. SARS CoV & SARS CoV-2 Recently, Pasquier and Robichon, 2020 (preprint) have investigated the Dicer host immunity system regarding SARs-CoV-2 within a computational approach, concluding SARS-CoV2 may manipulate this system of immunity against its host, requiring further research. Mu et al., 2020 suggest SARs-CoV2 suppresses RNAi thus preventing recognition by the encoded ribonuclease dicer protein Viral suppressors of RNA silencing (VSRs) suppress RNAi at pre or post-dicer level to overcome host defense and establish infection. Cui et al. (2015) from Wuhan University laboratory of virology, identified a novel VSR from coronaviruses (CoVs) including Severe acute respiratory syndrome coronavirus (SARS-CoV) and showed that the coronavirus nucelocaspid protein (N-protein), conserved and expressed in all coronaviruses, suppressed RNAi triggered by either short hairpin RNAs or small interfering RNAs in mammalian cells. They went on to show using mouse hepatitis virus A-59 (MHV-A59) which is closely linked to SARS-CoV in the family coronaviridae, that the viral replication was increased when the N proteins (novel VSR) were expressed but that knockdown of DICER1 gene or Ago2 transcripts facilitated the viral replication specifically in mammalian cells. They demonstrate that the N-protein of CoVs could efficiently inhibit dicer-mediated dsRNA cleavage and post-Dicer activities by sequestering dsRNAs and siRNAs. Kannan et al. (2020) performed clustal W analysis of N-Protein for SARS-CoV and COVID-19 demonstrating 90% sequence identity from an NCBI amino acid blast of both nucleocapsid (N) protein sequences (figure2). They suggest that the N-protein of COVID-19 may also function as a VSR for RNAi to overcome host defense. Ding et al. (2017) show that both MHV and SARS-CoV N proteins can also disrupt protein activator of protein kinase R (PACT), a cellular dsRNA-binding protein which binds to RIG-I and MDA5 to activate interferon (IFN) production to prevent antiviral host response. Literature Review PMID: 17181864: Bennasser and Jeang, 2006 • HIV-1 Tat Interaction With Dicer: Requirement for RNA • Tat-Dicer interaction depends on RNA, requires the helicase domain of Dicer, and is independent of Tat's transactivation domain. PMID: 18325616: Chen et al., 2008 • HCV Core Protein Interacts With Dicer to Antagonize RNA Silencing PMID: 26085159: Cui et al., 2015 • The Nucleocapsid Protein of Coronaviruses Acts as a Viral Suppressor of RNA Silencing in Mammalian Cells PMID: 24303839: Devasthanam et al, 2014 • This study investigates the role of the dicer protein in immune cell development and function using dicer1 cre-lox knockout models to conditionally ablate dicer1 in different immune cell subsets. PMID: 28591694: Ding et al., 2017 • The nucleocapsid proteins of mouse hepatitis virus and severe acute respiratory syndrome coronavirus share the same IFN-β antagonizing mechanism: attenuation of PACT-mediated RIG-I/MDA5 activation PMID: 30015086: Ding et al., 2018 • Antiviral RNA Interference in Mammals: Indicates infection of plants and insects with RNA and DNA viruses triggers Dicer-dependent production of virus-derived small interfering RNAs (vsiRNAs), which subsequently guide specific virus clearance by RNA interference (RNAi). PMID: 25176334: Foulkes et al., 2012-REVIEW • Review of DICER1: DICER1 Mutations, microRNAs and Mechanisms PMID: 16554838: Galiana-Arnoux et al., 2006 • Essential function in vivo for Dicer-2 in host defense against RNA viruses in drosophila. • https://pubmed.ncbi.nlm.nih.gov/16554838/ or https://www.nature.com/articles/ni1335 PMID: 21385408: Inchley et al., 2011 • Investigates ribonuclease Dicer and analyzed the gene expression of Dicer in newborns of which 37 infants had sufficient cord blood RNA with confirmed RSV disease <1yr. Demonstrates significant reduced Dicer expression in cord blood prior to severe disease in infants <1yr later. Conclude downregulation may predispose infants to RSV disease. PMID: 32141569: Kannan et al., 2020 • COVID-19 (Novel Coronavirus 2019) - Recent Trends • Perform W cluster analysis of COVID-19 and SARS-CoV nucleocapsid (N) protein sequences of the viruses showing 90% amino acid sequence similarity. Suggest the N-protein may be a VSR in RNAi by targeting DICER. PMID: 23849790: Klockow et al., 2013 • The HIV-1 Protein Vpr Targets the Endoribonuclease Dicer for Proteasomal Degradation to Boost Macrophage Infection PMID: 25883138: Kurzynska-Kokorniak et al., 2015 • Investigating the complexity of the mechanisms regulating Dicer gene expression and enzyme activities PMID: 24115437: Li et al, 2013 • Investigates RNA interference pathways in antiviral immunity in mammals overviewing dicer processing of dsRNA viral replication intermediates into siRNAs. PMID: 27273616: Machitani et al., 2016 • Dicer functions as an antiviral system against human adenoviruses via cleavage of adenovirus-encoded noncoding RNA PMID: 30872283: Maillard et al., 2019- REVIEW • Reviewing DICER1 within the anti-viral RNAi pathway in mammals PMID: 30682089: Modai et al, 2019 • HIV-1 infection increases miRNAs which inhibit Dicer PMID: 32291557: Mu et al, 2020 • SARS-CoV-2-encoded nucleocapsid protein acts as a viral suppressor of RNA interference in cells PMID: 16009718: Muljo et al., 2005 • Indicates absence of dicer results in abberant T-cell differentiation. PMID: 17613256: Otsuka, et al 2007 • Hypersusceptibility to Vesicular Stomatitis Virus Infection in Dicer1-Deficient Mice Is Due to Impaired miR24 and miR93 Expression No PMID: Preprint : Pasquier and Rubichon, 2020 • SARS-CoV-2 might manipulate against its host the immunity RNAi/Dicer/Ago system PMID: 22438534: Qi et al., 2012 • Targeting of Dicer-2 and RNA by a Viral RNA Silencing Suppressor in Drosophila Cells PMID: 28473628: Song and Rossi, 2017 • Molecular Mechanisms of Dicer: Endonuclease and Enzymatic Activity; to: Evidence Summary from Illumina curation team (Alison Coffey and Julie Taylor): The DICER1 gene, located on chromosome 14, position q32.13, was discovered in 2001 by Bernstein and is a member of the RNase III family, (also known as dicer 1, ribonuclease III; dicer1, Dcr-1 homolog (Drosophila); multinodular goitre 1). DICER1 is involved in the generation of double-stranded microRNAs (miRNAs), short non-coding RNAs, the cleavage of dsRNA into siRNAs, along with the biogenesis of numerous other small RNAs. There is increasing evidence DICER1 is also involved in regulating many other essential cellular processes such as those related to chromatin remodeling, inflammation, apoptosis and cell survival (Kurzynska-Kokorniak et al. 2015; Song and Rossi, 2017). DICER1 encodes a ∼220-KDa protein (RNase III endoribonuclease) which is a crucial component of the RNA Induced Silencing Complex (RISC) loading complex (RLC), comprised of dicer, Argonaute-2 (AGO-2), and trans-activation-responsive RNA binding protein 2 (TARBP2). The encoded protein is required by the RNA interference (RNAi) and small temporal RNA (stRNA) pathways to produce the active small RNA component which has a role in modulating gene expression at the post-transcriptional level. Research has shown that expression levels of cellular transcript and protein dicer are strictly controlled, with aberrant regulation contributing to carcinogenesis, neurodegenerative, rheumatic and immune system disorders. Studies have concluded that the encoded dicer ribonuclease-dependent processing of dsRNA viral replication intermediates into successive siRNAs is a conserved mammalian immune response to infection by positive-strand RNA viruses (Svobodova et al. 2016 summary & fig1; Li et al. 2013; Ding et al. 2018). Moreover, miRNAs play an important role in host-virus interactions in mammals (See Maillard et al. 2019 REVIEW; Foulkes et al. 2014 REVIEW). IMMUNE SYSTEM The cre-lox method for dicer1 gene knockout has been employed for studies into the role of dicer1 in immune cell development and function. Studies of dicer1 fl/fl mice have indicated short survival times along with severely impaired GMP differentiation into monocytes, neutrophils, myeloid DCs & mature macrophages. (Devasthanam et al. 2014). Results conclude that dicer1 is important in immune response and also vital for cell survival and apoptosis pathways. Muljo et al. (2005) investigated a conditional allele of dicer-1 (dcr-1) within a mouse model and showed that specific dcr-1 deletion in the T-cell lineage, resulted in impaired development of T-cells & aberrant cell differentiation of T-helper cells & cytokine production. Dcr-1 deletion in the thymus resulted in severe block in development of CD8+ T cells and resulted in defective microRNA processing in CD4+ T-cells. The results demonstrate Dicer regulates diverse aspects of T-cell biology along with cytokine production during T-cell differentiation where dicer-deficient T-cells preferentially express interferon-ƴ. VIRUSES Research by Galiana-Arnoux et al. (2006), of DICER in drosophila (drosophila have two dicer genes) have identified that DICER genes (Dcr1, miRNA pathway and Dcr2, RNAi pathway) control production of siRNA and a loss-of-function mutation in Dcr2 resulted in increased susceptibility to three different families of RNA viruses. Qi et al. (2012) research into RNAi gene silencing mechanism show that the B2 protein in Wuhan nodavirus (WhNV) suppresses Dcr2 in drosophila by direct interaction with the PAZ and RNAse III domains therefore blocking processing of dsRNA and siRNA. Evidence of a dicer antiviral system was also reported by Machitani et al. (2016) for mammalian human adenoviruses where DICER1 gene knockdown increased the copy number of adenovirus-encoding small RNAs (VA-RNAs) leading to the promotion of adenovirus replication; conversely, dicer overexpression significantly inhibited viral replication. Modai et al. (2019) conclude that HIV-1 infection inhibits DICER1 by altering miRNA expression. They conclude that upon HIV-1 infection, human miR-186, 210 and 222 directly regulate DICER1 gene expression causing down-regulation of the gene contributing to impaired cell-mediated immunity (fig6). Other methods of inhibition are from viral proteins, termed viral suppressors of RNA silencing, which interact and inhibit dicer ribonuclease activity in HIV-1 and hepatitis C infections. These viral proteins may mediate proteasomal degradation of endoribonuclease dicer through CRL4DCAF1 ubiquitin ligase complex (Klockow et al. 2013), interact directly via the core protein (Chen et al. 2008) or HIV-1 transactivation of transcription (Bennasser and Jeang, 2006). Through these methods they can block dicer interactions with TRBP2 or ADAR1, boost macrophage infection, and subsequently reduce the function of short hairpin RNAs (shRNAs) which thus inhibit RNA silencing. Ultimately these viruses, though various methods, supress the ability of dicer to process dsRNAs into siRNAs boosting viral infection and pathogenesis. Downregulation of DICER1 gene expression has additionally been found in cord blood of infants with severe respiratory syncytial virus (RSV), prior to RSV exposure, indicating this reduced expression may predispose newborns to RSV disease. Inchley et al. (2011) theorize that this occurs via disruption of leukocyte gene regulation of miRNA and direct anti-viral RNAi mechanisms. (Inchley et al. 2011 see section on “Dicer Gene Expression”). Otsuka et al. (2007) have shown using gene-trap methods to obtain viable dicer1 fl/fl mice where dicer1 deficiency caused impairment of miR24 and miR93 production resulting in susceptibility to vesticular stomatitis virus (VSV) and herpes simplex-1 virus, but not other viruses tested. SARS CoV & SARS CoV-2 Recently, Pasquier and Robichon, 2020 (preprint) have investigated the Dicer host immunity system regarding SARs-CoV-2 within a computational approach, concluding SARS-CoV2 may manipulate this system of immunity against its host, requiring further research. Mu et al., 2020 suggest SARs-CoV2 suppresses RNAi thus preventing recognition by the encoded ribonuclease dicer protein Viral suppressors of RNA silencing (VSRs) suppress RNAi at pre or post-dicer level to overcome host defense and establish infection. Cui et al. (2015) from Wuhan University laboratory of virology, identified a novel VSR from coronaviruses (CoVs) including Severe acute respiratory syndrome coronavirus (SARS-CoV) and showed that the coronavirus nucelocaspid protein (N-protein), conserved and expressed in all coronaviruses, suppressed RNAi triggered by either short hairpin RNAs or small interfering RNAs in mammalian cells. They went on to show using mouse hepatitis virus A-59 (MHV-A59) which is closely linked to SARS-CoV in the family coronaviridae, that the viral replication was increased when the N proteins (novel VSR) were expressed but that knockdown of DICER1 gene or Ago2 transcripts facilitated the viral replication specifically in mammalian cells. They demonstrate that the N-protein of CoVs could efficiently inhibit dicer-mediated dsRNA cleavage and post-Dicer activities by sequestering dsRNAs and siRNAs. Kannan et al. (2020) performed clustal W analysis of N-Protein for SARS-CoV and COVID-19 demonstrating 90% sequence identity from an NCBI amino acid blast of both nucleocapsid (N) protein sequences (figure2). They suggest that the N-protein of COVID-19 may also function as a VSR for RNAi to overcome host defense. Ding et al. (2017) show that both MHV and SARS-CoV N proteins can also disrupt protein activator of protein kinase R (PACT), a cellular dsRNA-binding protein which binds to RIG-I and MDA5 to activate interferon (IFN) production to prevent antiviral host response. Literature Review PMID: 17181864: Bennasser and Jeang, 2006 • HIV-1 Tat Interaction With Dicer: Requirement for RNA • Tat-Dicer interaction depends on RNA, requires the helicase domain of Dicer, and is independent of Tat's transactivation domain. PMID: 18325616: Chen et al., 2008 • HCV Core Protein Interacts With Dicer to Antagonize RNA Silencing PMID: 26085159: Cui et al., 2015 • The Nucleocapsid Protein of Coronaviruses Acts as a Viral Suppressor of RNA Silencing in Mammalian Cells PMID: 24303839: Devasthanam et al, 2014 • This study investigates the role of the dicer protein in immune cell development and function using dicer1 cre-lox knockout models to conditionally ablate dicer1 in different immune cell subsets. PMID: 28591694: Ding et al., 2017 • The nucleocapsid proteins of mouse hepatitis virus and severe acute respiratory syndrome coronavirus share the same IFN-β antagonizing mechanism: attenuation of PACT-mediated RIG-I/MDA5 activation PMID: 30015086: Ding et al., 2018 • Antiviral RNA Interference in Mammals: Indicates infection of plants and insects with RNA and DNA viruses triggers Dicer-dependent production of virus-derived small interfering RNAs (vsiRNAs), which subsequently guide specific virus clearance by RNA interference (RNAi). PMID: 25176334: Foulkes et al., 2012-REVIEW • Review of DICER1: DICER1 Mutations, microRNAs and Mechanisms PMID: 16554838: Galiana-Arnoux et al., 2006 • Essential function in vivo for Dicer-2 in host defense against RNA viruses in drosophila. • https://pubmed.ncbi.nlm.nih.gov/16554838/ or https://www.nature.com/articles/ni1335 PMID: 21385408: Inchley et al., 2011 • Investigates ribonuclease Dicer and analyzed the gene expression of Dicer in newborns of which 37 infants had sufficient cord blood RNA with confirmed RSV disease <1yr. Demonstrates significant reduced Dicer expression in cord blood prior to severe disease in infants <1yr later. Conclude downregulation may predispose infants to RSV disease. PMID: 32141569: Kannan et al., 2020 • COVID-19 (Novel Coronavirus 2019) - Recent Trends • Perform W cluster analysis of COVID-19 and SARS-CoV nucleocapsid (N) protein sequences of the viruses showing 90% amino acid sequence similarity. Suggest the N-protein may be a VSR in RNAi by targeting DICER. PMID: 23849790: Klockow et al., 2013 • The HIV-1 Protein Vpr Targets the Endoribonuclease Dicer for Proteasomal Degradation to Boost Macrophage Infection PMID: 25883138: Kurzynska-Kokorniak et al., 2015 • Investigating the complexity of the mechanisms regulating Dicer gene expression and enzyme activities PMID: 24115437: Li et al, 2013 • Investigates RNA interference pathways in antiviral immunity in mammals overviewing dicer processing of dsRNA viral replication intermediates into siRNAs. PMID: 27273616: Machitani et al., 2016 • Dicer functions as an antiviral system against human adenoviruses via cleavage of adenovirus-encoded noncoding RNA PMID: 30872283: Maillard et al., 2019- REVIEW • Reviewing DICER1 within the anti-viral RNAi pathway in mammals PMID: 30682089: Modai et al, 2019 • HIV-1 infection increases miRNAs which inhibit Dicer PMID: 32291557: Mu et al, 2020 • SARS-CoV-2-encoded nucleocapsid protein acts as a viral suppressor of RNA interference in cells PMID: 16009718: Muljo et al., 2005 • Indicates absence of dicer results in abberant T-cell differentiation. PMID: 17613256: Otsuka, et al 2007 • Hypersusceptibility to Vesicular Stomatitis Virus Infection in Dicer1-Deficient Mice Is Due to Impaired miR24 and miR93 Expression No PMID: Preprint : Pasquier and Rubichon, 2020 • SARS-CoV-2 might manipulate against its host the immunity RNAi/Dicer/Ago system PMID: 22438534: Qi et al., 2012 • Targeting of Dicer-2 and RNA by a Viral RNA Silencing Suppressor in Drosophila Cells PMID: 28473628: Song and Rossi, 2017 • Molecular Mechanisms of Dicer: Endonuclease and Enzymatic Activity |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.348 | DICER1 |
Rebecca Foulger commented on gene: DICER1: Evidence Summary from Illumina curation team: The DICER1 gene, located on chromosome 14, position q32.13, was discovered in 2001 by Bernstein and is a member of the RNase III family, (also known as dicer 1, ribonuclease III; dicer1, Dcr-1 homolog (Drosophila); multinodular goitre 1). DICER1 is involved in the generation of double-stranded microRNAs (miRNAs), short non-coding RNAs, the cleavage of dsRNA into siRNAs, along with the biogenesis of numerous other small RNAs. There is increasing evidence DICER1 is also involved in regulating many other essential cellular processes such as those related to chromatin remodeling, inflammation, apoptosis and cell survival (Kurzynska-Kokorniak et al. 2015; Song and Rossi, 2017). DICER1 encodes a ∼220-KDa protein (RNase III endoribonuclease) which is a crucial component of the RNA Induced Silencing Complex (RISC) loading complex (RLC), comprised of dicer, Argonaute-2 (AGO-2), and trans-activation-responsive RNA binding protein 2 (TARBP2). The encoded protein is required by the RNA interference (RNAi) and small temporal RNA (stRNA) pathways to produce the active small RNA component which has a role in modulating gene expression at the post-transcriptional level. Research has shown that expression levels of cellular transcript and protein dicer are strictly controlled, with aberrant regulation contributing to carcinogenesis, neurodegenerative, rheumatic and immune system disorders. Studies have concluded that the encoded dicer ribonuclease-dependent processing of dsRNA viral replication intermediates into successive siRNAs is a conserved mammalian immune response to infection by positive-strand RNA viruses (Svobodova et al. 2016 summary & fig1; Li et al. 2013; Ding et al. 2018). Moreover, miRNAs play an important role in host-virus interactions in mammals (See Maillard et al. 2019 REVIEW; Foulkes et al. 2014 REVIEW). IMMUNE SYSTEM The cre-lox method for dicer1 gene knockout has been employed for studies into the role of dicer1 in immune cell development and function. Studies of dicer1 fl/fl mice have indicated short survival times along with severely impaired GMP differentiation into monocytes, neutrophils, myeloid DCs & mature macrophages. (Devasthanam et al. 2014). Results conclude that dicer1 is important in immune response and also vital for cell survival and apoptosis pathways. Muljo et al. (2005) investigated a conditional allele of dicer-1 (dcr-1) within a mouse model and showed that specific dcr-1 deletion in the T-cell lineage, resulted in impaired development of T-cells & aberrant cell differentiation of T-helper cells & cytokine production. Dcr-1 deletion in the thymus resulted in severe block in development of CD8+ T cells and resulted in defective microRNA processing in CD4+ T-cells. The results demonstrate Dicer regulates diverse aspects of T-cell biology along with cytokine production during T-cell differentiation where dicer-deficient T-cells preferentially express interferon-ƴ. VIRUSES Research by Galiana-Arnoux et al. (2006), of DICER in drosophila (drosophila have two dicer genes) have identified that DICER genes (Dcr1, miRNA pathway and Dcr2, RNAi pathway) control production of siRNA and a loss-of-function mutation in Dcr2 resulted in increased susceptibility to three different families of RNA viruses. Qi et al. (2012) research into RNAi gene silencing mechanism show that the B2 protein in Wuhan nodavirus (WhNV) suppresses Dcr2 in drosophila by direct interaction with the PAZ and RNAse III domains therefore blocking processing of dsRNA and siRNA. Evidence of a dicer antiviral system was also reported by Machitani et al. (2016) for mammalian human adenoviruses where DICER1 gene knockdown increased the copy number of adenovirus-encoding small RNAs (VA-RNAs) leading to the promotion of adenovirus replication; conversely, dicer overexpression significantly inhibited viral replication. Modai et al. (2019) conclude that HIV-1 infection inhibits DICER1 by altering miRNA expression. They conclude that upon HIV-1 infection, human miR-186, 210 and 222 directly regulate DICER1 gene expression causing down-regulation of the gene contributing to impaired cell-mediated immunity (fig6). Other methods of inhibition are from viral proteins, termed viral suppressors of RNA silencing, which interact and inhibit dicer ribonuclease activity in HIV-1 and hepatitis C infections. These viral proteins may mediate proteasomal degradation of endoribonuclease dicer through CRL4DCAF1 ubiquitin ligase complex (Klockow et al. 2013), interact directly via the core protein (Chen et al. 2008) or HIV-1 transactivation of transcription (Bennasser and Jeang, 2006). Through these methods they can block dicer interactions with TRBP2 or ADAR1, boost macrophage infection, and subsequently reduce the function of short hairpin RNAs (shRNAs) which thus inhibit RNA silencing. Ultimately these viruses, though various methods, supress the ability of dicer to process dsRNAs into siRNAs boosting viral infection and pathogenesis. Downregulation of DICER1 gene expression has additionally been found in cord blood of infants with severe respiratory syncytial virus (RSV), prior to RSV exposure, indicating this reduced expression may predispose newborns to RSV disease. Inchley et al. (2011) theorize that this occurs via disruption of leukocyte gene regulation of miRNA and direct anti-viral RNAi mechanisms. (Inchley et al. 2011 see section on “Dicer Gene Expression”). Otsuka et al. (2007) have shown using gene-trap methods to obtain viable dicer1 fl/fl mice where dicer1 deficiency caused impairment of miR24 and miR93 production resulting in susceptibility to vesticular stomatitis virus (VSV) and herpes simplex-1 virus, but not other viruses tested. SARS CoV & SARS CoV-2 Recently, Pasquier and Robichon, 2020 (preprint) have investigated the Dicer host immunity system regarding SARs-CoV-2 within a computational approach, concluding SARS-CoV2 may manipulate this system of immunity against its host, requiring further research. Mu et al., 2020 suggest SARs-CoV2 suppresses RNAi thus preventing recognition by the encoded ribonuclease dicer protein Viral suppressors of RNA silencing (VSRs) suppress RNAi at pre or post-dicer level to overcome host defense and establish infection. Cui et al. (2015) from Wuhan University laboratory of virology, identified a novel VSR from coronaviruses (CoVs) including Severe acute respiratory syndrome coronavirus (SARS-CoV) and showed that the coronavirus nucelocaspid protein (N-protein), conserved and expressed in all coronaviruses, suppressed RNAi triggered by either short hairpin RNAs or small interfering RNAs in mammalian cells. They went on to show using mouse hepatitis virus A-59 (MHV-A59) which is closely linked to SARS-CoV in the family coronaviridae, that the viral replication was increased when the N proteins (novel VSR) were expressed but that knockdown of DICER1 gene or Ago2 transcripts facilitated the viral replication specifically in mammalian cells. They demonstrate that the N-protein of CoVs could efficiently inhibit dicer-mediated dsRNA cleavage and post-Dicer activities by sequestering dsRNAs and siRNAs. Kannan et al. (2020) performed clustal W analysis of N-Protein for SARS-CoV and COVID-19 demonstrating 90% sequence identity from an NCBI amino acid blast of both nucleocapsid (N) protein sequences (figure2). They suggest that the N-protein of COVID-19 may also function as a VSR for RNAi to overcome host defense. Ding et al. (2017) show that both MHV and SARS-CoV N proteins can also disrupt protein activator of protein kinase R (PACT), a cellular dsRNA-binding protein which binds to RIG-I and MDA5 to activate interferon (IFN) production to prevent antiviral host response. Literature Review PMID: 17181864: Bennasser and Jeang, 2006 • HIV-1 Tat Interaction With Dicer: Requirement for RNA • Tat-Dicer interaction depends on RNA, requires the helicase domain of Dicer, and is independent of Tat's transactivation domain. PMID: 18325616: Chen et al., 2008 • HCV Core Protein Interacts With Dicer to Antagonize RNA Silencing PMID: 26085159: Cui et al., 2015 • The Nucleocapsid Protein of Coronaviruses Acts as a Viral Suppressor of RNA Silencing in Mammalian Cells PMID: 24303839: Devasthanam et al, 2014 • This study investigates the role of the dicer protein in immune cell development and function using dicer1 cre-lox knockout models to conditionally ablate dicer1 in different immune cell subsets. PMID: 28591694: Ding et al., 2017 • The nucleocapsid proteins of mouse hepatitis virus and severe acute respiratory syndrome coronavirus share the same IFN-β antagonizing mechanism: attenuation of PACT-mediated RIG-I/MDA5 activation PMID: 30015086: Ding et al., 2018 • Antiviral RNA Interference in Mammals: Indicates infection of plants and insects with RNA and DNA viruses triggers Dicer-dependent production of virus-derived small interfering RNAs (vsiRNAs), which subsequently guide specific virus clearance by RNA interference (RNAi). PMID: 25176334: Foulkes et al., 2012-REVIEW • Review of DICER1: DICER1 Mutations, microRNAs and Mechanisms PMID: 16554838: Galiana-Arnoux et al., 2006 • Essential function in vivo for Dicer-2 in host defense against RNA viruses in drosophila. • https://pubmed.ncbi.nlm.nih.gov/16554838/ or https://www.nature.com/articles/ni1335 PMID: 21385408: Inchley et al., 2011 • Investigates ribonuclease Dicer and analyzed the gene expression of Dicer in newborns of which 37 infants had sufficient cord blood RNA with confirmed RSV disease <1yr. Demonstrates significant reduced Dicer expression in cord blood prior to severe disease in infants <1yr later. Conclude downregulation may predispose infants to RSV disease. PMID: 32141569: Kannan et al., 2020 • COVID-19 (Novel Coronavirus 2019) - Recent Trends • Perform W cluster analysis of COVID-19 and SARS-CoV nucleocapsid (N) protein sequences of the viruses showing 90% amino acid sequence similarity. Suggest the N-protein may be a VSR in RNAi by targeting DICER. PMID: 23849790: Klockow et al., 2013 • The HIV-1 Protein Vpr Targets the Endoribonuclease Dicer for Proteasomal Degradation to Boost Macrophage Infection PMID: 25883138: Kurzynska-Kokorniak et al., 2015 • Investigating the complexity of the mechanisms regulating Dicer gene expression and enzyme activities PMID: 24115437: Li et al, 2013 • Investigates RNA interference pathways in antiviral immunity in mammals overviewing dicer processing of dsRNA viral replication intermediates into siRNAs. PMID: 27273616: Machitani et al., 2016 • Dicer functions as an antiviral system against human adenoviruses via cleavage of adenovirus-encoded noncoding RNA PMID: 30872283: Maillard et al., 2019- REVIEW • Reviewing DICER1 within the anti-viral RNAi pathway in mammals PMID: 30682089: Modai et al, 2019 • HIV-1 infection increases miRNAs which inhibit Dicer PMID: 32291557: Mu et al, 2020 • SARS-CoV-2-encoded nucleocapsid protein acts as a viral suppressor of RNA interference in cells PMID: 16009718: Muljo et al., 2005 • Indicates absence of dicer results in abberant T-cell differentiation. PMID: 17613256: Otsuka, et al 2007 • Hypersusceptibility to Vesicular Stomatitis Virus Infection in Dicer1-Deficient Mice Is Due to Impaired miR24 and miR93 Expression No PMID: Preprint : Pasquier and Rubichon, 2020 • SARS-CoV-2 might manipulate against its host the immunity RNAi/Dicer/Ago system PMID: 22438534: Qi et al., 2012 • Targeting of Dicer-2 and RNA by a Viral RNA Silencing Suppressor in Drosophila Cells PMID: 28473628: Song and Rossi, 2017 • Molecular Mechanisms of Dicer: Endonuclease and Enzymatic Activity |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.347 | IDE | Alison Coffey commented on gene: IDE: Evidence Summary from Illumina curation team: Insulin-degrading enzyme (IDE), also known as insulysin, is a member of the zinc metalloproteinase family that was initially implicated in insulin degradation. It is highly conserved among different species and has the ability to interact with a variety of functionally unrelated ligands that share little homology in their primary amino acid sequences. Several human viruses use enzymes as receptors. Li et al. (2006) (PMID 17055432) established IDE as a cellular receptor for both cell-free and cell-associated Varicella-zoster virus (VZV), the cause of chickenpox and shingles in humans. VZV is likely spread as cell-free virus to susceptible hosts but transmitted by cell-to-cell spread in the body and in vitro. Li et al. (2006) showed that IDE interacts with the VZV glycoprotein E (gE) (which is essential for virus infection) through its extracellular domain. Downregulation of IDE by siRNA, or blocking of IDE with antibody, with soluble IDE protein extracted from liver, or with bacitracin inhibited VZV infection. Cell-to-cell spread of virus was also impaired by blocking IDE. Transfection of cell lines impaired for VZV infection with a plasmid expressing human IDE resulted in increased entry and enhanced infection with cell-free and cell-associated virus. Li et al. (2010) subsequently reported that a recombinant soluble IDE (rIDE) enhanced VZV infectivity at an early step of infection associated with an increase in virus internalization, and increased cell-to-cell spread. In 2017, Hahn et al. demonstrated that mature HIV-1 p6 protein (stability of which inversely affects the replication capacity of HIV-1) is a substrate for IDE. IDE is both sufficient and required for the degradation of p6, which is approximately 100-fold more efficiently degraded by IDE than its eponymous substrate insulin. An IDE specific inhibitor, 6bK, and exogenous insulin, were both shown to interfere with X4-tropic HIV-1 replication in activated PBMCs, most probably by competing with p6 for degradation by IDE. In addition, an IDE-insensitive p6 mutant of HIV-1 exhibits impaired replication capacity but is insensitive to treatment with insulin or 6bK. Conversely, neither virus release and maturation, nor the amounts of particle associated Vpr and p6 itself were altered in IDE knock out cells. The data support a model in which IDE is responsible for the rapid degradation of p6 entering the cell as part of the incoming virion, a process that appears to be crucial to achieve optimal X4-tropic virus replication. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.347 | ILF3 | Alison Coffey commented on gene: ILF3: Evidence Summary from Illumina curation team: The ILF3 gene encodes two alternatively spliced and ubiquitously expressed RNA binding protein isoforms, NF110 and NF90. NF110 and NF90 have been shown to interact with viral RNAs and proteins to inhibit the replication of a number of viruses, including PV-RIPO, a chimeric poliovirus and human rhinovirus; HIV-1, and vesicular stomatitis virus (VSV) (reviewed Castella et al. 2015). Conversely, NF110 and NF90 have also been associated with the enhancement of viral replication in the case of DNA hepatitis B virus (HBV), ssRNA viruses from the Flaviviridae family, hepatitis C virus and influenza B (FLUBV) (reviewed Castella et al. 2015; Patzina et al, 2017). Recently, Watson et al (2020) demonstrated a role for the ILF3 isoforms in enhancing the translation of IFNB1 and ISGs in response to a viral infection. Depletion of NF90/NF110 from HeLa cells using siRNA resulted in an impaired antiviral activity with a reduction in the expression of ISG proteins and conditioned medium generated in ILF3-depleted cells conferred less resistance to Echovirus 7 infection. The specific depletion of NF110 was shown to cause a decrease in the association of IFNB1 mRNA with the polysomal fractions in poly(I:C) stimulated conditions (Watson et al. 2020). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.338 | TLR5 |
Sarah Leigh gene: TLR5 was added gene: TLR5 was added to COVID-19 research. Sources: OMIM Mode of inheritance for gene: TLR5 was set to Unknown Phenotypes for gene: TLR5 were set to {Legionnaire disease, susceptibility to} 608556 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.297 | SCARB1 |
Eleanor Williams gene: SCARB1 was added gene: SCARB1 was added to COVID-19 research. Sources: Literature Mode of inheritance for gene: SCARB1 was set to Unknown Added comment: Not associated with any relevant disease phenotype in OMIM. SCARB1 is also known as SRB1 PMID: 12356718 - Scarselli et al 2002 - Characterization of hepatitis C virus (HCV) envelope glycoprotein E2 binding after chemical or enzymic modification of the cell surface led to the identification of the scavenger receptor type B class I (SR-BI) as the E2 receptor on HepG2 cells. PMID: 28827115 - Sadeghi et al 2017 - SCARB1 rs10846744 (CC) genotype (P=0.001) was strongly associated with sustained virological response PMID: 28363797 - Westhaus et al 2018 - Non-synonymous variants: S112F and T175A have greatly reduced Hepatitus C virus (HCV) receptor function. When present on the cell surface, these variants are impaired in their ability to interact with HCV E2. Non-coding variants: The G allele in rs3782287 is associated with decreased viral load. PMID: 29715527 - Naffari et al 2018 -looked at treatment responses in 395 treatment-naïve patients with chronic Hepatitus C Virus (CHC) genotype 1 treated with pegylated interferon-α and ribavirin. Rapid virologic response (RVR), complete early virologic response (cEVR) , and sustained virologic responseSVR were significantly associated with SCARB1 rs10846744 (CC). Sources: Literature |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.294 | OCLN |
Eleanor Williams gene: OCLN was added gene: OCLN was added to COVID-19 research. Sources: Literature Mode of inheritance for gene: OCLN was set to Unknown Publications for gene: OCLN were set to 19182773; 31328852 Review for gene: OCLN was set to RED Added comment: Not associated with any viral susceptibility phenotypes in OMIM. Evidence that OCLN is involved in HCV cell entry PMID: 19182773 - Ploss et al 2009 - show that human occludin is an essential HCV cell entry factor that is able to render murine cells infectable with HCVpp. Similarly, OCLN is required for the HCV-susceptibility of human cells, because its overexpression in uninfectable cells specifically enhanced HCVpp uptake, whereas its silencing in permissive cells impaired both HCVpp and HCVcc infection. PMID: 31328852 - Lavie et al 2019 - looked at which residues in OCLN affect hepatitis C virus (HCV) entry. In the context of full-length OCLN, mutation of I279 and W281 residues only partially affected infection and cell surface localization. Sources: Literature |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.171 | IL6ST | Sophie Hambleton reviewed gene: IL6ST: Rating: GREEN; Mode of pathogenicity: None; Publications: 31914175, 32207811; Phenotypes: recurrent infections, eczema, bronchiectasis, high IgE, eosinophilia, defective B cell memory, impaired acute-phase response, stuve-wiedemann syndrome, craniosynostosis; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.171 | IL6R | Sophie Hambleton reviewed gene: IL6R: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Impaired humoral immunity, hyper-IgE, recurrent infections, eczema; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.160 | TLR3 |
Abdelazeem Elhabyan changed review comment from: These studies demonstrate the deleterious effect of some TLR3 mutations and predisposition to Herpes simplex encephalitis in 4 separate studies on unrelated patients from different countries. TLR3 mutations in 3 children were associated with severe influenza pneumonitis. Finally, 2 other studies evaluate the protective effect of a common polymorphism of TLR3 against HIV infection in repetitively exposed individuals. Accordingly, we might find protective or deleterious effects in COVID19 patients due to different mutations of TLR3. TLR3 is a receptor for dsRNA (intermediate in the replication of many viruses including HSV) which induces IFN response to prevent the cytopathic effects of different viruses. A heterozygous dominant-negative mutation of TLR3 was discovered in 2 unrelated children with HSE. TLR3 mutant fibroblasts from the 2 patients were infected by HSV-1 and vesicular stomatitis virus(VSV).IFNB and IFNL production were impaired in those cells, viral replication was higher and cell survival was lower in the 2 patients' cells when compared with the controls. Blood leukocyte response normally with to poly (I:C) which explains why the disease is not disseminated and also explains the redundant role of TLR3 in blood cells(13). Similar findings were reported in a polish child in 2011, however, the patient here was compound heterozygous for a missense mutation leading to autosomal recessive inheritance of TLR3 deficiency(14). Treatment with IFN alpha and beta canceled the effect of the dominant-negative mutation increasing the causality relationship between TLR3 mutants and viral immune response(13). Relatives of the 2 patients with the same mutation did not show decreased interferon response nor they showed HSE as a complication of HSV which means that this mutation does not have full penetrance(13). In another study, 110 patients with HSE were sequenced (exons of TLR3) to establish a new association of TLR3 mutations and HSE. The study reported 5 novel variants other than those previously described in the literature. 2 of them were not pathogenically demonstrated by in vitro studies while 3 of them were pathogenic with similar findings to those described above. Additionally, they found 3 patients with the same mutations previously described in the literature so the total of patients with deleterious TLR3 mutations would be 6 out of 110. 4 of those 6 patients(66%) with TLR6 mutations had a relapse In contrast to 12 out of 120(total cohort) (10%)(15). In a recent study done on 16 patients with adult-onset HSE using whole-exome sequencing(WES), 1 patient was discovered to have TLR3 deficiency, while 8 other patients had mutations in other genes in the TLR3 pathway(2 patients with a mutation in IRF3, 2 patients with mutations in STAT1, 2 patients with mutations in TRIF, 1 patient with a mutation in TYK2,1 patients with a mutation in MAVS, and finally 1 patient with a mutation in TBK1)(16) A common polymorphism in TLR3(rs3775291) was linked to increased resistance to HIV1 infection by the genotyping study of Spanish and Italian cohorts with a P value of .023 and .029 respectively. The study compared HIV exposed seronegative cohort(IV drug abuse and sexually active ) with controls. Repetitive HIV exposure in the cohort was evidenced by HCV seropositivity. In vitro infection of PBMCs with HIV showed increased resistance in cells carrying the allele and also TLR3 stimulation by TLR3 agonists showed an increased level of expression of CD69, IL-6, and CCL3(17). A similar study was conducted on the Caucasian population showing the protective effect of the allele against HIV infection(18). Autosomal recessive IRF7 and IRF9 deficiencies impair type I and III IFN immunity and underlie severe influenza pneumonitis. We report three unrelated children with influenza A virus (IAV) infection manifesting as acute respiratory distress syndrome (IAV-ARDS), heterozygous for rare TLR3 variants (P554S in two patients and P680L in the third) causing autosomal dominant (AD) TLR3 deficiency. AD TLR3 deficiency can underlie herpes simplex virus-1 (HSV-1) encephalitis (HSE) by impairing cortical neuron-intrinsic type I IFN immunity to HSV-1. TLR3-mutated leukocytes produce normal levels of IFNs in response to IAV. In contrast, TLR3-mutated fibroblasts produce lower levels of IFN-β and -λ, and display enhanced viral susceptibility, upon IAV infection. Moreover, the patients’ iPSC-derived pulmonary epithelial cells (PECs) are susceptible to IAV. Treatment with IFN-α2b or IFN-λ1 rescues this phenotype. AD TLR3 deficiency may thus underlie IAV-ARDS by impairing TLR3-dependent, type I, and/or III IFN–mediated, PEC-intrinsic immunity. Its clinical penetrance is incomplete for both IAV-ARDS and HSE, consistent with their typically sporadic nature(PMID: 31217193 ) 13.Zhang SY, Jouanguy E, Ugolini S, et al. TLR3 deficiency in patients with herpes simplex encephalitis. Science. 2007;317(5844):1522–1527. doi:10.1126/science.1139522 14.Guo Y, Audry M, Ciancanelli M, et al. Herpes simplex virus encephalitis in a patient with complete TLR3 deficiency: TLR3 is otherwise redundant in protective immunity. J Exp Med. 2011;208(10):2083–2098. doi:10.1084/jem.20101568 15.Lim HK, Seppänen M, Hautala T, et al. TLR3 deficiency in herpes simplex encephalitis: high allelic heterogeneity and recurrence risk. Neurology. 2014;83(21):1888–1897. doi:10.1212/WNL.0000000000000999 16.Mørk N, Kofod-Olsen E, Sørensen KB, et al. Mutations in the TLR3 signaling pathway and beyond in adult patients with herpes simplex encephalitis. Genes Immun. 2015;16(8):552–566. doi:10.1038/gene.2015.46 17.Sironi M, Biasin M, Cagliani R, et al. A common polymorphism in TLR3 confers natural resistance to HIV-1 infection. J Immunol. 2012;188(2):818–823. doi:10.4049/jimmunol.1102179 18.Huik K, Avi R, Pauskar M, et al. Association between TLR3 rs3775291 and resistance to HIV among highly exposed Caucasian intravenous drug users. Infect Genet Evol. 2013;20:78–82. doi:10.1016/j.meegid.2013.08.008 19.Lim HK, Huang SXL, Chen J, et al. Severe influenza pneumonitis in children with inherited TLR3 deficiency. J Exp Med. 2019;216(9):2038–2056. doi:10.1084/jem.20181621; to: These studies demonstrate the deleterious effect of some TLR3 mutations and predisposition to Herpes simplex encephalitis in 4 separate studies on unrelated patients from different countries. TLR3 mutations in 3 children were associated with severe influenza pneumonitis. Finally, 2 other studies evaluate the protective effect of a common polymorphism of TLR3 against HIV infection in repetitively exposed individuals. Accordingly, we might find protective or deleterious effects in COVID19 patients due to different mutations of TLR3. TLR3 is a receptor for dsRNA (intermediate in the replication of many viruses including HSV) which induces IFN response to prevent the cytopathic effects of different viruses. A heterozygous dominant-negative mutation of TLR3 was discovered in 2 unrelated children with HSE. TLR3 mutant fibroblasts from the 2 patients were infected by HSV-1 and vesicular stomatitis virus(VSV).IFNB and IFNL production were impaired in those cells, viral replication was higher and cell survival was lower in the 2 patients' cells when compared with the controls. Blood leukocyte response normally with to poly (I:C) which explains why the disease is not disseminated and also explains the redundant role of TLR3 in blood cells(13). Similar findings were reported in a polish child in 2011, however, the patient here was compound heterozygous for a missense mutation leading to autosomal recessive inheritance of TLR3 deficiency(14). Treatment with IFN alpha and beta canceled the effect of the dominant-negative mutation increasing the causality relationship between TLR3 mutants and viral immune response(13). Relatives of the 2 patients with the same mutation did not show decreased interferon response nor they showed HSE as a complication of HSV which means that this mutation does not have full penetrance(13). In another study, 110 patients with HSE were sequenced (exons of TLR3) to establish a new association of TLR3 mutations and HSE. The study reported 5 novel variants other than those previously described in the literature. 2 of them were not pathogenically demonstrated by in vitro studies while 3 of them were pathogenic with similar findings to those described above. Additionally, they found 3 patients with the same mutations previously described in the literature so the total of patients with deleterious TLR3 mutations would be 6 out of 110. 4 of those 6 patients(66%) with TLR6 mutations had a relapse In contrast to 12 out of 120(total cohort) (10%)(15). In a recent study done on 16 patients with adult-onset HSE using whole-exome sequencing(WES), 1 patient was discovered to have TLR3 deficiency, while 8 other patients had mutations in other genes in the TLR3 pathway(2 patients with a mutation in IRF3, 2 patients with mutations in STAT1, 2 patients with mutations in TRIF, 1 patient with a mutation in TYK2,1 patients with a mutation in MAVS, and finally 1 patient with a mutation in TBK1)(16) A common polymorphism in TLR3(rs3775291) was linked to increased resistance to HIV1 infection by the genotyping study of Spanish and Italian cohorts with a P value of .023 and .029 respectively. The study compared HIV exposed seronegative cohort(IV drug abuse and sexually active ) with controls. Repetitive HIV exposure in the cohort was evidenced by HCV seropositivity. In vitro infection of PBMCs with HIV showed increased resistance in cells carrying the allele and also TLR3 stimulation by TLR3 agonists showed an increased level of expression of CD69, IL-6, and CCL3(17). A similar study was conducted on the Caucasian population showing the protective effect of the allele against HIV infection(18). Autosomal recessive IRF7 and IRF9 deficiencies impair type I and III IFN immunity and underlie severe influenza pneumonitis. We report three unrelated children with influenza A virus (IAV) infection manifesting as acute respiratory distress syndrome (IAV-ARDS), heterozygous for rare TLR3 variants (P554S in two patients and P680L in the third) causing autosomal dominant (AD) TLR3 deficiency. AD TLR3 deficiency can underlie herpes simplex virus-1 (HSV-1) encephalitis (HSE) by impairing cortical neuron-intrinsic type I IFN immunity to HSV-1. TLR3-mutated leukocytes produce normal levels of IFNs in response to IAV. In contrast, TLR3-mutated fibroblasts produce lower levels of IFN-β and -λ, and display enhanced viral susceptibility, upon IAV infection. Moreover, the patients’ iPSC-derived pulmonary epithelial cells (PECs) are susceptible to IAV. Treatment with IFN-α2b or IFN-λ1 rescues this phenotype. AD TLR3 deficiency may thus underlie IAV-ARDS by impairing TLR3-dependent, type I, and/or III IFN–mediated, PEC-intrinsic immunity. Its clinical penetrance is incomplete for both IAV-ARDS and HSE, consistent with their typically sporadic nature(PMID: 31217193 ) 13.Zhang SY, Jouanguy E, Ugolini S, et al. TLR3 deficiency in patients with herpes simplex encephalitis. Science. 2007;317(5844):1522–1527. doi:10.1126/science.1139522 14.Guo Y, Audry M, Ciancanelli M, et al. Herpes simplex virus encephalitis in a patient with complete TLR3 deficiency: TLR3 is otherwise redundant in protective immunity. J Exp Med. 2011;208(10):2083–2098. doi:10.1084/jem.20101568 15.Lim HK, Seppänen M, Hautala T, et al. TLR3 deficiency in herpes simplex encephalitis: high allelic heterogeneity and recurrence risk. Neurology. 2014;83(21):1888–1897. doi:10.1212/WNL.0000000000000999 16.Mørk N, Kofod-Olsen E, Sørensen KB, et al. Mutations in the TLR3 signaling pathway and beyond in adult patients with herpes simplex encephalitis. Genes Immun. 2015;16(8):552–566. doi:10.1038/gene.2015.46 17.Sironi M, Biasin M, Cagliani R, et al. A common polymorphism in TLR3 confers natural resistance to HIV-1 infection. J Immunol. 2012;188(2):818–823. doi:10.4049/jimmunol.1102179 18.Huik K, Avi R, Pauskar M, et al. Association between TLR3 rs3775291 and resistance to HIV among highly exposed Caucasian intravenous drug users. Infect Genet Evol. 2013;20:78–82. doi:10.1016/j.meegid.2013.08.008 19.Lim HK, Huang SXL, Chen J, et al. Severe influenza pneumonitis in children with inherited TLR3 deficiency. J Exp Med. 2019;216(9):2038–2056. doi:10.1084/jem.20181621 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.83 | NFKBID | Sarah Leigh Added comment: Comment on list classification: Not associated with phenotype in OMIM or in Gen2Phen. The only variants are structural rearrangements that include NFKBID amongst other genes. PMID 26973645 reports "heterozygous mutation in the nfkbid gene encoding the atypical IκB protein IκBNS led to reduced steady state IgM and IgG3 antibody levels and impaired response to vaccination with TI-2 antigens in mice". Thus, variants in human NFKBID may also result in reduced levels of IgM and IgG3 and compromized vaccination responses. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.81 | POLR3A |
Abdelazeem Elhabyan changed review comment from: This gene is responsible for A subunit of Polymerase which sense DNA in viral infection eg Varicella Zoster. SARS-CoV-2 is an RNA virus. Inborn errors in RNA polymerase III underlie severe varicella zoster virus infections(PMID: 28783042) We report 4 cases of acute severe VZV infection affecting the central nervous system or the lungs in unrelated, otherwise healthy children who are heterozygous for rare missense mutations in POLR3A (one patient), POLR3C (one patient), or both (two patients). POLR3A and POLR3C encode subunits of RNA polymerase III. Leukocytes from all 4 patients tested exhibited poor IFN induction in response to synthetic or VZV-derived DNA. Moreover, leukocytes from 3 of the patients displayed defective IFN production upon VZV infection and reduced control of VZV replication. These phenotypes were rescued by transduction with relevant WT alleles. This work demonstrates that monogenic or digenic POLR3A and POLR3C deficiencies confer increased susceptibility to severe VZV disease in otherwise healthy children, providing evidence for an essential role of a DNA sensor in human immunity Different classes of PRRs are involved in recognition of virus infections, including membrane-associated TLRs; cytosolic retinoic acid–inducible gene 1–like (RIG-I–like) receptors, which sense RNA; and DNA sensors (24). Each of these classes of PRRs stimulates production of IFNs, which exhibit antiviral activity through their ability to induce IFN-stimulated genes (ISGs). With respect to DNA sensors, TLR9 detects unmethylated DNA, RNA polymerase III (POL III) recognizes AT-rich DNA, while gamma-interferon-inducible protein 16 (IFI16) and cyclic GMP-AMP synthase (cGAS) sense double-stranded DNA in a sequence-independent manner (25–29). Mutations in RNA Polymerase III genes and defective DNA sensing in adults with varicella-zoster virus CNS infection PMID: 29728610 Recently, deficiency in the cytosolic DNA sensor RNA Polymerase III was described in children with severe primary varicella-zoster virus (VZV) infection in the CNS and lungs. In the present study we examined adult patients with VZV CNS infection caused by viral reactivation. By whole exome sequencing we identified mutations in POL III genes in two of eight patients. These mutations were located in the coding regions of the subunits POLR3A and POLR3E. In functional assays, we found impaired expression of antiviral and inflammatory cytokines in response to the POL III agonist Poly(dA:dT) as well as increased viral replication in patient cells compared to controls. Altogether, this study provides significant extension on the current knowledge on susceptibility to VZV infection by demonstrating mutations in POL III genes associated with impaired immunological sensing of AT-rich DNA in adult patients with VZV CNS infection.; to: This gene is responsible for A subunit of Polymerase which senses DNA viruses especially AT-rich regions eg Varicella Zoster. SARS-CoV-2 is an RNA virus. Inborn errors in RNA polymerase III underlie severe varicella zoster virus infections(PMID: 28783042) We report 4 cases of acute severe VZV infection affecting the central nervous system or the lungs in unrelated, otherwise healthy children who are heterozygous for rare missense mutations in POLR3A (one patient), POLR3C (one patient), or both (two patients). POLR3A and POLR3C encode subunits of RNA polymerase III. Leukocytes from all 4 patients tested exhibited poor IFN induction in response to synthetic or VZV-derived DNA. Moreover, leukocytes from 3 of the patients displayed defective IFN production upon VZV infection and reduced control of VZV replication. These phenotypes were rescued by transduction with relevant WT alleles. This work demonstrates that monogenic or digenic POLR3A and POLR3C deficiencies confer increased susceptibility to severe VZV disease in otherwise healthy children, providing evidence for an essential role of a DNA sensor in human immunity Different classes of PRRs are involved in recognition of virus infections, including membrane-associated TLRs; cytosolic retinoic acid–inducible gene 1–like (RIG-I–like) receptors, which sense RNA; and DNA sensors (24). Each of these classes of PRRs stimulates production of IFNs, which exhibit antiviral activity through their ability to induce IFN-stimulated genes (ISGs). With respect to DNA sensors, TLR9 detects unmethylated DNA, RNA polymerase III (POL III) recognizes AT-rich DNA, while gamma-interferon-inducible protein 16 (IFI16) and cyclic GMP-AMP synthase (cGAS) sense double-stranded DNA in a sequence-independent manner (25–29). Mutations in RNA Polymerase III genes and defective DNA sensing in adults with varicella-zoster virus CNS infection PMID: 29728610 Recently, deficiency in the cytosolic DNA sensor RNA Polymerase III was described in children with severe primary varicella-zoster virus (VZV) infection in the CNS and lungs. In the present study we examined adult patients with VZV CNS infection caused by viral reactivation. By whole exome sequencing we identified mutations in POL III genes in two of eight patients. These mutations were located in the coding regions of the subunits POLR3A and POLR3E. In functional assays, we found impaired expression of antiviral and inflammatory cytokines in response to the POL III agonist Poly(dA:dT) as well as increased viral replication in patient cells compared to controls. Altogether, this study provides significant extension on the current knowledge on susceptibility to VZV infection by demonstrating mutations in POL III genes associated with impaired immunological sensing of AT-rich DNA in adult patients with VZV CNS infection. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.40 | RELA |
Ellen McDonagh Source Expert Review Green was added to RELA. Added phenotypes RelA haplosufficiency; Mucosal ulceration, impaired NFkB activation; Mucocutaneous ulceration, chronic, 618287; Immunodeficiencies affecting cellular and humoral immunity for gene: RELA Rating Changed from Red List (low evidence) to Green List (high evidence) |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.40 | TNFRSF4 |
Ellen McDonagh Source Expert Review Green was added to TNFRSF4. Added phenotypes Kaposi's Sarcoma, impaired immunity to HHV8, OX40 deficiency; Immunodeficiencies affecting cellular and humoral immunity; Impaired immunity to HHV8, Kaposis sarcoma; Combined immunodeficiency for gene: TNFRSF4 Rating Changed from Red List (low evidence) to Green List (high evidence) |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.36 | MAGT1 |
Ellen McDonagh gene: MAGT1 was added gene: MAGT1 was added to Viral susceptibility. Sources: Expert Review Green,Combined B and T cell defect v1.12,ESID Registry 20171117,North West GLH,Victorian Clinical Genetics Services,GRID V2.0,NHS GMS,GOSH PID v.8.0,London North GLH,IUIS Classification February 2018 Mode of inheritance for gene: MAGT1 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females Publications for gene: MAGT1 were set to 21796205; 25504528; 25205404; 24550228; 23846901; 27095930; 23871722; 21983175; 25956530 Phenotypes for gene: MAGT1 were set to Chronic active EBV, lymphoproliferation, combined immunodeficiency, impaired t cell function; Combined immunodeficiency; Immunodeficiency, X-linked, with magnesium defect, Epstein-Barr virus infection and neoplasia; Immunodeficiency, X-linked, with magnesium defect; Diseases of Immune Dysregulation; Epstein-Barr virus infection and neoplasia (XMEN); EBV infection, lymphoma, viral infections, respiratory and GI infections; XMEN syndrome |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.36 | RELA |
Ellen McDonagh gene: RELA was added gene: RELA was added to Viral susceptibility. Sources: IUIS Classification December 2019 Mode of inheritance for gene: RELA was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: RELA were set to 28600438; 32086639; 32048120; 29305315 Phenotypes for gene: RELA were set to RelA haplosufficiency; Mucosal ulceration, impaired NFkB activation; Mucocutaneous ulceration, chronic, 618287; Immunodeficiencies affecting cellular and humoral immunity |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.36 | AIRE |
Ellen McDonagh gene: AIRE was added gene: AIRE was added to Viral susceptibility. Sources: Expert Review Green,ESID Registry 20171117,North West GLH,Victorian Clinical Genetics Services,GRID V2.0,NHS GMS,GOSH PID v.8.0,London North GLH,IUIS Classification February 2018 Mode of inheritance for gene: AIRE was set to BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal Publications for gene: AIRE were set to 9888391; 19807739; 11600535; 11836330; 10677297; 29437776; 29108822; 19758376; 9398839; 9837820; 28911151 Phenotypes for gene: AIRE were set to Autoimmune polyendocrinopathy syndrome, type I, with or without reversible metaphyseal dysplasia, 240300; Multiple endocrine deficiency Addison disease candidiasis syndrome; Autoimmune hypoparathyroidism chronic candidiasis Addison disease syndrome; Diseases of Immune Dysregulation; Chronic mucocutaneous candidiasis (CMC); Autoimmunity: hypoparathyroidism hypothyroidism, adrenal insufficiency, diabetes, gonadal dysfunction and other endocrine abnormalities, chronic mucocutaneous candidiasis, dental enamel hypoplasia, alopecia areata enteropathy, pernicious anemia; Hypoparathyroidism Addison disease mucocutaneous candidiasis syndrome; Autoimmune polyendocrinopathy candidiasis ectodermal dystrophy (APECED) |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.36 | TNFRSF4 |
Ellen McDonagh gene: TNFRSF4 was added gene: TNFRSF4 was added to Viral susceptibility. Sources: ESID Registry 20171117,Victorian Clinical Genetics Services,GRID V2.0,IUIS Classification December 2019,Expert Review Red,IUIS Classification February 2018 Mode of inheritance for gene: TNFRSF4 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TNFRSF4 were set to 32086639; 32048120 Phenotypes for gene: TNFRSF4 were set to Kaposi's Sarcoma, impaired immunity to HHV8, OX40 deficiency; Immunodeficiencies affecting cellular and humoral immunity; Impaired immunity to HHV8, Kaposis sarcoma; Combined immunodeficiency |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.36 | RMRP |
Ellen McDonagh gene: RMRP was added gene: RMRP was added to Viral susceptibility. Sources: Expert Review Green,Combined B and T cell defect v1.12,ESID Registry 20171117,North West GLH,Victorian Clinical Genetics Services,GRID V2.0,NHS GMS,GOSH PID v.8.0,London North GLH,IUIS Classification February 2018 Mode of inheritance for gene: RMRP was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: RMRP were set to 26830278; 2328993; 3582365; 24217815; 26279652; 25663137 Phenotypes for gene: RMRP were set to Short-limbed dwarfism with metaphyseal dysostosis, sparse hair, bone marrow failure, autoimmunity, susceptibility to lymphoma and other cancers, impaired spermatogenesis, neuronal dysplasia of the intestine; Cartilage hair hypoplasia; Cartilage-hair hypoplasia; Anauxetic dysplasia 1, 232220; Omenn syndrome; Cartilage-hair hypoplasia, with or without immunodeficiency; Combined immunodeficiencies with associated or syndromic features |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.36 | IL2RA |
Ellen McDonagh gene: IL2RA was added gene: IL2RA was added to Viral susceptibility. Sources: Expert Review Green,ESID Registry 20171117,North West GLH,Victorian Clinical Genetics Services,GRID V2.0,NHS GMS,London North GLH,IUIS Classification February 2018 Mode of inheritance for gene: IL2RA was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: IL2RA were set to 23416241; 9096364; 17196245; 24116927 Phenotypes for gene: IL2RA were set to Combined immunodeficiency; Immunodeficiency 41 with lymphoproliferation and autoimmunity, 606367; Interleukin 2 receptor alpha deficiency (CD25) (IPEX phenotype); Diseases of Immune Dysregulation; Interleukin-2 receptor, alpha chain, deficiency of; Omenn syndrome; Lymphoproliferation, autoimmunity, impaired T cell proliferation |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| COVID-19 research v0.36 | DOCK8 |
Ellen McDonagh gene: DOCK8 was added gene: DOCK8 was added to Viral susceptibility. Sources: Expert Review Green,Combined B and T cell defect v1.12,ESID Registry 20171117,North West GLH,Victorian Clinical Genetics Services,GRID V2.0,NHS GMS,GOSH PID v.8.0,London North GLH,IUIS Classification February 2018 Mode of inheritance for gene: DOCK8 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: DOCK8 were set to 25724123; 19776401; 20004785; 25627830 Phenotypes for gene: DOCK8 were set to Combined immunodeficiency; Hyper-IgE recurrent infection syndrome, autosomal recessive; Hyper IgE syndrome (HIES); Immunodeficiencies affecting cellular and humoral immunity; Low NK cells with poor function, eosinophilia, recurrent infections, cutaneous viral, fungal and staphylococcal infections, severe atopy, cancer diathesis; Hyper-IgE recurrent infection syndrome; impaired T cell function, Atopy, cutaneous viral infections |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||