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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. |
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COVID-19 research v0.347 | IRF1 | Julie Taylor commented on gene: IRF1: Evidence Summary from Illumina curation team: IRF1 encodes interferon regulatory factor 1, a member of the family of transcription factors that play a role in regulating both the innate and adaptive immune response. IRF1 is constitutively expressed at a low level but significantly elevated upon IFN-I stimulation, elevated IRF1 further amplifies the IFN response through a positive feedback loop (Lukele et al. 2019, Review). IRF-1 attenuates the replication of several viruses, including hepatitis C virus, West Nile virus (WNV), and EMCV, (Schoggins et al 2011) and IRF1 knock out mice are more susceptible to some viruses, such as EMCV and coxsackievirus B3, than wild type mice (Kimura et al. 1994). Using an IRF1 deficient BEAS2B bronchial epithelial cell line with increased susceptibility to VSV, and multiple strains of influenza viruses, Panda et al. 2019, showed that IRF1 is important for the early expression of types I and III IFNs and ISGs. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
COVID-19 research v0.341 | IRF1 | Julie Taylor reviewed gene: IRF1: Rating: GREEN; Mode of pathogenicity: ; Publications: 31155227, 31156620, 24719409, 21478870, 80092222; Phenotypes: ; Mode of inheritance: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
COVID-19 research v0.336 | IRF1 | Rebecca Foulger commented on gene: IRF1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
COVID-19 research v0.333 | IRF1 |
Rebecca Foulger gene: IRF1 was added gene: IRF1 was added to COVID-19 research. Sources: Expert list,OMIM,Expert Review Green Mode of inheritance for gene: IRF1 was set to Unknown |
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COVID-19 research v0.214 | TMPRSS2 | Sarah Leigh changed review comment from: Preprint https://doi.org/10.1101/2020.05.04.075911 reports rs35074065 of TMPRSS2 results in the overexpression of both TMPRSS2 and a nearby gene MX1. rs35074065 overlaps with a transcription factor binding site of an activator (IRF1) and a repressor (IRF2). IRF1 activator can bind to variant delC allele, but IRF2 repressor fails to bind. Thus, in an individual carrying the delC allele, there is only activation, but no repression. On viral entry, IRF1 mediated upregulation of MX1 leads to neutrophil infiltration and processing of 614G mutated Spike protein by neutrophil Elastase. The simultaneous processing of 614G spike protein by TMPRSS2 and Elastase serine proteases facilitates the entry of the 614G subtype into host cells. Thus, SARS-CoV-2, particularly the 614G subtype, has spread more easily and with higher frequency to Europe and North America where the delC allele regulating expression of TMPRSS2 and MX1 host proteins is common, but not to East Asia where this allele is rare.; to: Preprint https://doi.org/10.1101/2020.05.04.075911 reports rs35074065 of TMPRSS2 results in the overexpression of both TMPRSS2 and a nearby gene MX1. rs35074065 overlaps with a transcription factor binding site of an activator (IRF1) and a repressor (IRF2). IRF1 activator can bind to variant delC allele, but IRF2 repressor fails to bind. Thus, in an individual carrying the delC allele of rs35074065, there is only activation, but no repression. On viral entry, IRF1 mediated upregulation of MX1 leads to neutrophil infiltration and processing of 614G variant viral Spike protein by neutrophil Elastase. The simultaneous processing of 614G spike protein by TMPRSS2 and Elastase serine proteases facilitates the entry of the 614G subtype into host cells. Thus, SARS-CoV-2, particularly the 614G subtype, has spread more easily and with higher frequency to Europe and North America where the delC allele regulating expression of TMPRSS2 and MX1 host proteins is common, but not to East Asia where this allele is rare. |