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| Intellectual disability - microarray and sequencing v3.1556 | FBXW7 |
Konstantinos Varvagiannis gene: FBXW7 was added gene: FBXW7 was added to Intellectual disability. Sources: Literature Mode of inheritance for gene: FBXW7 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FBXW7 were set to 33057194; 35395208; 30885698; 26482194; 19963109; 20332316 Phenotypes for gene: FBXW7 were set to Neurodevelopmental abnormality; Global developmental delay; Intellectual disability; Macrocephaly; Microcephaly; Abnormality of brain morphology; Abnormality of the corpus callosum; Abnormality of the cerebellum; Abnormality of the cardiovascular system; Seizures; Strabismus; Abnormality of the palate Penetrance for gene: FBXW7 were set to unknown Review for gene: FBXW7 was set to AMBER Added comment: While Kaplanis et al (2020 - Ref1), identified FBXW7 among 285 genes significantly associated with developmental disorders, a recent study by Stephenson et al (2022 - Ref2) describes the neurodevelopmental phenotype of 35 individuals making this gene relevant to the current panel. There are previous reports of dn/inh germline variants in individuals (likely 7) with tumor predisposition although a neurodevelopmental phenotype was not reported in most cases. There is currently no FBXW7-related phenotype in OMIM. The gene is included in the DD panel of G2P [associated with: FBXW7-related developmental disorder (monoallelic), confidence: definitive, citing the study by Kaplanis et al]. SysID lists FBXW7 among the candidate ID genes (same Ref.). The gene has a green rating for ID in PanelApp Australia (VCGS participating in the recent publication). Consider inclusion with amber/green rating. Also consider inclusion in other panels that may be relevant(macro/microcephaly, seizures, CHD, corpus callosum / cerebellar abnormalities, cleft palate, WT, etc). [1]------------ Kaplanis et al (2020 - PMID: 33057194), by combining exome data from 31,058 parent offspring trios from the DDD study, Radboudumc and GeneDx, identified 285 genes significantly associated with developmental disorders, 28 of which (incl. FBXW7) not previously robustly associated with these disorders. [2]------------ Stephenson et al (2022 - PMID: 35395208) provide clinical information on 35 individuals harboring germline monoallelic FBXW7 variants or chromosomal deletions spanning this gene. The phenotype corresponded to a phenotypically variable NDD characterized by hypotonia (in about 2/3), neurodevelopmental abnormality (34/35 - as discussed later), seizures (8/35), abnormal brain morphology (13/17 - in 7/17 abnormal CC, in 5/17 abn. cerebellum, etc), head circumference (macrocephaly in 10/35, microcephaly in 2/35). Additional features included abnormal palate or uvula morphology (10/35 - cleft palate in 3 from 2 families while 1 individual from a 3rd family had bifid uvula) or abnormal heart morphology (11/35), ophthalmologic features (e.g. strabismus in 5/35) or hearing impairment (2/35). There was no recognizable gestalt (deeply set eyes with upper eyelid fullness in 9/35). As for the DD/ID this ranged from borderline to severe, characterized as mild-moderate in 27/35, severe in 3/35. One individual did not present neurodevelopmental abnormality 1/35. FBXW7 encodes F-box and WD40 domain protein 7 which is part of the SCF E3 ligase complex (SKP1/CUL1/F-box protein) exerting a role of recognition and binding of target proteins for degradation by the ubiquitin proteasome system. In this way FBWX7 participates in regulating a network of proteins involved in cell division, growth, differentiation (as summarized by Roversi et al - Ref2). Most individuals were investigated by trio-WES/WGS (few with singleton WES or CMA only). 28 germline FBXW7 variants were identified incl. missense (N=21), pLoF (predicted or not to undergo NMD) and 2 deletions encompassing but not limited to FBXW7. Additional SNVs/CNVs (e.g. an inh intragenic DPP6 dup in one individual (#9) with deletion, other de novo 4q CNVs (#10), an inh 22q spanning partially an ISCA TS region, a CACNA1A and KMT2D SNV, etc) were reported in few individuals. Most variants arose dn (N=30) with two individuals displaying mosaicism (2/30) and three individuals having inherited the variant from their affected parent. CNVs had occurred dn. 3 missense SNVs were recurrent in unrelated individuals. All variants identified affected all FBXW7 isoforms. As the authors comment missense variants clustered at the C-terminal half of the protein with most (16/21) occurring within the WD40 domain. [The N-terminal part commented in the literature to affect localization]. The crystal structure of FBXW7 and SKP1 complex has been determined with CYCLIN E1/DISC1 as substrates, and in silico modeling revealed that all missense variants aligned with residues required for this interaction, or adjacent ones. All were absent from gnomAD, while missense variants from gnomAD (N=78) were not predicted have significant effect on the binding affinity. Variant studies revealed that most missense variants (6/7 tested - Arg689Gln being the exception) are unlikely to cause protein instability or degradation in vivo. Co-expression of these missense variants with CYCLIN E1 / E2, known FBXW7 substrates revealed that variants were less efficient at degrading the substrate with variants in the WD40 domain having greater impact (in some cases E1 / E2 - specific). Elav-Gal4 mediated neuronal knockdown of the Drosophila ortholog archipelago (ago) using 2 RNAi-s with different efficiency was shown to affect learning or compromise neuronal function (also related to the level of knockdown). The authors summarize results from animal models for the role of this gene in development and the nervous system. KO mice die in utero at E10.5 manifesting abn. of hematopoietic or vascular development and heart-chamber maturation(*). Some htz knock-in for human cancer variants, display perinatal lethality, abn lung, cleft palate (30%)(*),etc. Conditional gut specific deletion results in impaired differentiation of intestinal goblet cells (*)(constipation in 16/35 in cohort). KO limited to CNS and PNS results in defective sucking and morphological brain abnormalities. Haploinsufficiency in the nervous system was associated with impaired differentiation of neural stem cells (possibly through a Notch-mediated mechanism). KO in Schwann cells of the peripheral nervous system resulted in enhanced myelination. Excessive oligodendrocyte cells and hypermyelination (as a result of elevated Notch & mTOR signaling) are observed in homozygous mutant zebrafish or after morpholino-mediated fbxw7 knockdown. Overall, the authors propose haploinsufficiency or loss-of-function as the underlying mechanism. Finally, as the authors comment, FBXW7 is a tumor suppressor among the most commonly mutated genes in human cancer (3.5%). Germline variants have been previously reported in individuals with cancer (Wilms tumor, rhabdoid, etc - most summarized below). However, none of the 35 individuals in this cohort (oldest 44 y.o.) had any history of cancer. Reports of individuals with germline variants causing (monoallelic) disruption of FBXW7 - cases without DD/ID: [3]------------ Mahamdallie et al (2019 - PMID: 30885698) investigated with WES a cohort of 890 individuals with Wilms tumor (799 non-familial disease, 91 from WT pedigrees). In this context they identified 4 individuals having developed WT (ages: 28-76m) with FBXW7 dn or inherited LoF variants (710G>A / p.Trp237* dn - 1972C>T / p.Arg658* - inh:NA, 1017_1021del5, 670C>T - paternal / p.Arg224* inh:NA - RefSeq not provided). One additional individual with a missense variant (1753A>T / p.Ser585Cys - dn) had developed rhabdoid tumor. While the authors mentioned additional features for other subjects in their cohort, among the 5 individuals with FBXW7 variants, only one had hypotonia (ID_0592) and another (ID_7520) had two febrile convulsions. [4]------------ Roversi et al (2015 - PMID: 26482194) described the phenotype of a 34 y.o. female with syndromic presentation (macrocephaly, nephrotic syndrome due to FSGS, Hodgkin's lymphoma, Wilms tumor, ovarian cystadenoma, breast carcinoma) harboring a 157 kb deletion of 4q31.3. Eventual DD/ID was not reported despite detailed clinical description. The deletion spanned almost the entire FBXW7 gene and a pseudogene (hg19 - chr4:153205202-153362047). The authors provided evidence that the del affected the maternal allele as dn event (maternal mosaicism excluded). Expression of FBXW7 in patient-derived EBV lymphoblastoid cell line revealed decreased levels of expression compared to controls. At somatic level, the authors looked for eventual 2nd hit in tumor tissue (which was not the case) while they demonstrated decreased FBXW7 expression in a WT sample compared to normal renal tissue. Previously, variants in other genes candidate for the phenotype were ruled out (Sanger & MLPA for TP53, BRCA1/2, PALB2, WT1, 11p15 MS-MLPA, std karyotype). [5]------------ Kuiper et al (2015 - PMID: 19963109), in a 58 y.o. patient with recurrence of RCC, identified a constitutional translocation [t(3;4)(q21;q31)]. Using long-range PCR they defined the breakpoints at 3q21.3 (128379059 - hg18) between the PLXNA1 and C3orf56 genes while the chr4 breakpoint was located within the second intron of FBXW7 (pos. 153500813 - hg18). There were no additional phenotypes reported. [6]------------ Williams et al (2010 - PMID: 20332316) reported a patient with WT harboring germline variants in WT1 and FBXW7. While the phenotype was sufficiently explained by a germline stopgain WT1 variant with a frameshift WT1 variant (as 2nd hit) confined to the tumor, the authors identified a germline in-frame FBXW7 insertion in the same individual (c.45_46insCCT / p.Thr15_Gly16insPro - RefS : NA) [if correct corresponding to: https://gnomad.broadinstitute.org/variant/4-153332910-C-CAGG - 345/281696 alleles in gnomAD]. Sources: Literature |
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| Intellectual disability - microarray and sequencing v3.1270 | KMT2D | Arina Puzriakova Phenotypes for gene: KMT2D were changed from Kabuki syndrome to Kabuki syndrome 1, OMIM:147920 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.3 | TASP1 |
Zornitza Stark gene: TASP1 was added gene: TASP1 was added to Intellectual disability. Sources: Expert list Mode of inheritance for gene: TASP1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TASP1 were set to 31209944; 31350873 Phenotypes for gene: TASP1 were set to Developmental delay; microcephaly; dysmorphic features; congenital abnormalities Review for gene: TASP1 was set to GREEN gene: TASP1 was marked as current diagnostic Added comment: Four unrelated families reported; two with founder mutation. Protein interacts with KMT2A and KMT2D. Another de novo missense variant reported in a single infant with multiple congenital abnormalities, insufficient evidence for mono allelic disease at present. Sources: Expert list |
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| Intellectual disability - microarray and sequencing v2.938 | TRPM3 |
Konstantinos Varvagiannis changed review comment from: Dyment et al. (2019 - https://doi.org/10.1038/s41431-019-0462-x) report on 7 unrelated individuals with a recurrent de novo TRPM3 missense variant [NM_020952.4:c.2509G>A - NP_066003.3:p.(Val837Met)] as well as an additional individual with a further de novo missense variant [c.2810C>A or p.(Pro937Gln) - same ref. sequences]. Overlapping features included hypotonia (7/8 - in one case mixed tone abnormality), DD/ID (8/8 - all individuals at appropriate age - degree relevant), EEG-confirmed epilepsy (7/8). Autism-like features were observed in 4 (out of 6 for whom this information was reported). Other features were noted in a minority (or were private to certain) of these individuals. Different clinical types of seizures were reported incl. absence, generalized-toni-clonic, infantile spasms as well as subclinical ones. Onset was in infancy or early childhood. In all individuals the variant was found following trio exome sequencing. The first variant fulfilled ACMG criteria to be classified as pathogenic due to it's de novo occurrence, prevalence in affected individuals (>=6 affected individuals and in the same time) absence from population databases, in silico predictions in favour of pathogenicity (PS2, PS4_Moderate, PM2, PP3). The Pro937Gln variant is however classified as a VUS. The subject harboring this variant had an additional de novo variant in another gene (DDB1) not associated with any phenotype, to date. Several other genetic causes had previously been ruled out for most individuals by other investigations : aCGH was normal in all, FMR1 testing in 6 subjects, genes (PHF6, MECP2, MCT8) or smaller panels for ID (the latter in 3 subjects), mtDNA or testing of nuclear genes for mitochondrial disorders, etc. TRPM3 encodes transient receptor potential (TRP) cation channel, subfamily M, member 3. TRP channels are a superfamily of gated cation channels sensitive to various physical or chemical stimuli (Clapham 2003 - PMID: 14654832 cited) eg. temperature or pain. The gene is highly expressed in the brain in humans and other vertebrates (Grimm et al. 2003 - PMID : 12672799 and GTEx - https://gtexportal.org/home/gene/TRPM3). Animal models : In rat brain, expression is initially restricted to neurons but later - as myelination progresses - shifts to oligodendrocytes (cited : Hoffmann et al. 2010 - PMID: 20163522). Most subjects had normal brain MRI appart from one individual with nonspecific white matter hyperintensities and another with possible mild cerebral volume loss. Trpm3 -/- mice show attenuated nocifensive behavior after heat or dermal injection of pregnenolone sulfate. Heat or pain insensitivity was reported only for 2 individuals. Functional studies were not carried out, although some hypotheses are proposed following in silico modeling of the TRPM3 variants using an available structure for TRPM7. As discussed by Dyment et al., happloinsufficiency appears to be unlikely given the presence of LoF variants in ExAC/gnomAD (pLI of 0), some intragenic copy number variants in DGV. In addition, pathogenicity of deletions spanning only TRPM3 or additional proximal genes was not evident in 2 cases: - In the first case a exon 1-9 deletion was found in 2 brothers with Becker muscular dystrophy due to DMD intragenic duplication and autism/cognitive impairment though the TRPM3 deletion was found also in unaffected family members. The deletion was also found in unaffected relatives. A multiple hit hypothesis was hypothesized for this family. [Pagnamenta et al. 2011 - PMID: 21484199] - Kuniba et al. [2009 - PMID: 19343044] reported a 1.27-Mb deletion spanning TRPM3, KLF9, SMC5 and MAMDC2 in a patient with Kabuki syndrome working diagnosis. Segregation studies were however not possible. At the time, the molecular etiology of Kabuki syndrome (KMT2D/KDM6A) was not known. ----- TRPM3 is not associated with any phenotype in OMIM or G2P. This gene is included in panels for ID offered by some diagnostic laboratories (eg. GeneDx participating in the above study). ----- As a result, TRPM3 seems to fulfill criteria for inclusion in the ID/epilepsy panels probably as green (# of individuals, degree of ID relevant, EEG-confirmed epilepsy) or amber (if further functional evidence would be required). [Please consider eligibility for inclusion in other possibly relevant panels eg. autism, etc]. Sources: Literature; to: Dyment et al. (2019 - https://doi.org/10.1038/s41431-019-0462-x) report on 7 unrelated individuals with a recurrent de novo TRPM3 missense variant [NM_020952.4:c.2509G>A - NP_066003.3:p.(Val837Met)] as well as an additional individual with a further de novo missense variant [c.2810C>A or p.(Pro937Gln) - same ref. sequences]. Overlapping features included hypotonia (7/8 - in one case mixed tone abnormality), DD/ID (8/8 - all individuals at appropriate age - degree relevant), EEG-confirmed epilepsy (7/8). Autism-like features were observed in 4 (out of 6 for whom this information was reported). Other features were noted in a minority (or were private to certain) of these individuals. Different clinical types of seizures were reported incl. absence, generalized-toni-clonic, infantile spasms as well as subclinical ones. Onset was in infancy or early childhood. In all individuals the variant was found following trio exome sequencing. The first variant fulfilled ACMG criteria to be classified as pathogenic due to it's de novo occurrence, prevalence in affected individuals (>=6 affected individuals and in the same time) absence from population databases, in silico predictions in favour of pathogenicity (PS2, PS4_Moderate, PM2, PP3). The Pro937Gln variant is however also present once in gnomAD (1/251370 alleles or AF:3.98e-6) and is classified as VUS according to the ACMG criteria. The subject harboring this variant had an additional de novo variant in another gene (DDB1) not associated with any phenotype, to date. Several other genetic causes had previously been ruled out for most individuals by other investigations : aCGH was normal in all, FMR1 testing in 6 subjects, genes (PHF6, MECP2, MCT8) or smaller panels for ID (the latter in 3 subjects), mtDNA or testing of nuclear genes for mitochondrial disorders, etc. TRPM3 encodes transient receptor potential (TRP) cation channel, subfamily M, member 3. TRP channels are a superfamily of gated cation channels sensitive to various physical or chemical stimuli (Clapham 2003 - PMID: 14654832 cited) eg. temperature or pain. The gene is highly expressed in the brain in humans and other vertebrates (Grimm et al. 2003 - PMID : 12672799 and GTEx - https://gtexportal.org/home/gene/TRPM3). Animal models : In rat brain, expression is initially restricted to neurons but later - as myelination progresses - shifts to oligodendrocytes (cited : Hoffmann et al. 2010 - PMID: 20163522). Most subjects had normal brain MRI appart from one individual with nonspecific white matter hyperintensities and another with possible mild cerebral volume loss. Trpm3 -/- mice show attenuated nocifensive behavior after heat or dermal injection of pregnenolone sulfate. Heat or pain insensitivity was reported only for 2 individuals. Functional studies were not carried out, although some hypotheses are proposed following in silico modeling of the TRPM3 variants using an available structure for TRPM7. As discussed by Dyment et al., happloinsufficiency appears to be unlikely given the presence of LoF variants in ExAC/gnomAD (pLI of 0), some intragenic copy number variants in DGV. In addition, pathogenicity of deletions spanning only TRPM3 or additional proximal genes was not evident in 2 cases: - In the first case a exon 1-9 deletion was found in 2 brothers with Becker muscular dystrophy due to DMD intragenic duplication and autism/cognitive impairment though the TRPM3 deletion was found also in unaffected family members. The deletion was also found in unaffected relatives. A multiple hit hypothesis was hypothesized for this family. [Pagnamenta et al. 2011 - PMID: 21484199] - Kuniba et al. [2009 - PMID: 19343044] reported a 1.27-Mb deletion spanning TRPM3, KLF9, SMC5 and MAMDC2 in a patient with Kabuki syndrome working diagnosis. Segregation studies were however not possible. At the time, the molecular etiology of Kabuki syndrome (KMT2D/KDM6A) was not known. ----- TRPM3 is not associated with any phenotype in OMIM or G2P. This gene is included in panels for ID offered by some diagnostic laboratories (eg. GeneDx participating in the above study). ----- As a result, TRPM3 seems to fulfill criteria for inclusion in the ID/epilepsy panels probably as green (# of individuals, degree of ID relevant, EEG-confirmed epilepsy) or amber (if further functional evidence would be required). [Please consider eligibility for inclusion in other possibly relevant panels eg. autism, etc]. Sources: Literature |
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| Intellectual disability - microarray and sequencing v2.938 | TRPM3 |
Konstantinos Varvagiannis gene: TRPM3 was added gene: TRPM3 was added to Intellectual disability. Sources: Literature Mode of inheritance for gene: TRPM3 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: TRPM3 were set to doi.org/10.1038/s41431-019-0462-x Phenotypes for gene: TRPM3 were set to Generalized hypotonia; Global developmental delay; Intellectual disability; Seizures; Autistic behavior Penetrance for gene: TRPM3 were set to unknown Mode of pathogenicity for gene: TRPM3 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments Review for gene: TRPM3 was set to GREEN gene: TRPM3 was marked as current diagnostic Added comment: Dyment et al. (2019 - https://doi.org/10.1038/s41431-019-0462-x) report on 7 unrelated individuals with a recurrent de novo TRPM3 missense variant [NM_020952.4:c.2509G>A - NP_066003.3:p.(Val837Met)] as well as an additional individual with a further de novo missense variant [c.2810C>A or p.(Pro937Gln) - same ref. sequences]. Overlapping features included hypotonia (7/8 - in one case mixed tone abnormality), DD/ID (8/8 - all individuals at appropriate age - degree relevant), EEG-confirmed epilepsy (7/8). Autism-like features were observed in 4 (out of 6 for whom this information was reported). Other features were noted in a minority (or were private to certain) of these individuals. Different clinical types of seizures were reported incl. absence, generalized-toni-clonic, infantile spasms as well as subclinical ones. Onset was in infancy or early childhood. In all individuals the variant was found following trio exome sequencing. The first variant fulfilled ACMG criteria to be classified as pathogenic due to it's de novo occurrence, prevalence in affected individuals (>=6 affected individuals and in the same time) absence from population databases, in silico predictions in favour of pathogenicity (PS2, PS4_Moderate, PM2, PP3). The Pro937Gln variant is however classified as a VUS. The subject harboring this variant had an additional de novo variant in another gene (DDB1) not associated with any phenotype, to date. Several other genetic causes had previously been ruled out for most individuals by other investigations : aCGH was normal in all, FMR1 testing in 6 subjects, genes (PHF6, MECP2, MCT8) or smaller panels for ID (the latter in 3 subjects), mtDNA or testing of nuclear genes for mitochondrial disorders, etc. TRPM3 encodes transient receptor potential (TRP) cation channel, subfamily M, member 3. TRP channels are a superfamily of gated cation channels sensitive to various physical or chemical stimuli (Clapham 2003 - PMID: 14654832 cited) eg. temperature or pain. The gene is highly expressed in the brain in humans and other vertebrates (Grimm et al. 2003 - PMID : 12672799 and GTEx - https://gtexportal.org/home/gene/TRPM3). Animal models : In rat brain, expression is initially restricted to neurons but later - as myelination progresses - shifts to oligodendrocytes (cited : Hoffmann et al. 2010 - PMID: 20163522). Most subjects had normal brain MRI appart from one individual with nonspecific white matter hyperintensities and another with possible mild cerebral volume loss. Trpm3 -/- mice show attenuated nocifensive behavior after heat or dermal injection of pregnenolone sulfate. Heat or pain insensitivity was reported only for 2 individuals. Functional studies were not carried out, although some hypotheses are proposed following in silico modeling of the TRPM3 variants using an available structure for TRPM7. As discussed by Dyment et al., happloinsufficiency appears to be unlikely given the presence of LoF variants in ExAC/gnomAD (pLI of 0), some intragenic copy number variants in DGV. In addition, pathogenicity of deletions spanning only TRPM3 or additional proximal genes was not evident in 2 cases: - In the first case a exon 1-9 deletion was found in 2 brothers with Becker muscular dystrophy due to DMD intragenic duplication and autism/cognitive impairment though the TRPM3 deletion was found also in unaffected family members. The deletion was also found in unaffected relatives. A multiple hit hypothesis was hypothesized for this family. [Pagnamenta et al. 2011 - PMID: 21484199] - Kuniba et al. [2009 - PMID: 19343044] reported a 1.27-Mb deletion spanning TRPM3, KLF9, SMC5 and MAMDC2 in a patient with Kabuki syndrome working diagnosis. Segregation studies were however not possible. At the time, the molecular etiology of Kabuki syndrome (KMT2D/KDM6A) was not known. ----- TRPM3 is not associated with any phenotype in OMIM or G2P. This gene is included in panels for ID offered by some diagnostic laboratories (eg. GeneDx participating in the above study). ----- As a result, TRPM3 seems to fulfill criteria for inclusion in the ID/epilepsy panels probably as green (# of individuals, degree of ID relevant, EEG-confirmed epilepsy) or amber (if further functional evidence would be required). [Please consider eligibility for inclusion in other possibly relevant panels eg. autism, etc]. Sources: Literature |
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| Intellectual disability - microarray and sequencing v2.468 | KMT2D | Louise Daugherty Source Victorian Clinical Genetics Services was added to KMT2D. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | KMT2D | BRIDGE consortium edited their review of KMT2D | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | KMT2D | BRIDGE consortium edited their review of KMT2D | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | KMT2D | BRIDGE consortium reviewed KMT2D | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||