ClinVar Miner

Submissions for variant NM_004004.6(GJB2):c.427C>T (p.Arg143Trp) (rs80338948)

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Total submissions: 15
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine RCV000211779 SCV000061515 pathogenic Rare genetic deafness 2017-06-06 criteria provided, single submitter clinical testing The p.Arg143Trp variant in GJB2 has been reported in many probands with hearing loss (Brobby 1998, Abe 2000, Rabionet 2000, Kenna 2001, Cryns 2004, Chaleshtori 2005, Snoeckx 2005, LMM data). Most of these probands were homozygous or compoun d heterozygous. It has been identified in 16/23974 African chromosomes by the Ge nome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs803 38948); however, its frequency is low enough to be consistent with a recessive c arrier frequency for autosomal recessive nonsyndromic hearing loss. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessi ve hearing loss based on homozygosity and compound heterozygosity in multiple af fected individuals with hearing loss and its low frequency in the general popula tion.
Genetic Services Laboratory, University of Chicago RCV000146023 SCV000193175 pathogenic Hearing impairment 2013-02-08 criteria provided, single submitter clinical testing
EGL Genetic Diagnostics,Eurofins Clinical Diagnostics RCV000255157 SCV000227320 pathogenic not provided 2015-05-15 criteria provided, single submitter clinical testing
GeneDx RCV000255157 SCV000322424 pathogenic not provided 2018-07-02 criteria provided, single submitter clinical testing The R143W variant in the GJB2 gene has been reported previously, both in the homozygous state and in trans with a second pathogenic variant, in individuals with autosomal recessive nonsyndromic hearing loss (Brobby et al., 1998; Maheshwari et al., 2003). The R143W variant is observed in 37/276682 (0.0134%) alleles in large population cohorts (Lek et al., 2016). The R143W variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. In-silico analyses, including protein predictors and evolutionary conservation, support a deleterious effect. Functional studies indicate that cells expressing R143W are unable to form functional channels and have altered conductance (Mese et al., 2004; Palmada et al., 2006). Missense variants in the same and nearby residues (R143Q/L, I140S, F142L, E147K) have been reported in the Human Gene Mutation Database in association with GJB2-related disorders (Stenson et al., 2014), supporting the functional importance of this region of the protein. We interpret R143W as a pathogenic variant.
Division of Genomic Diagnostics,The Children's Hospital of Philadelphia RCV000018533 SCV000599751 pathogenic Deafness, autosomal recessive 1A 2017-05-09 criteria provided, single submitter clinical testing
Fulgent Genetics,Fulgent Genetics RCV000515418 SCV000611272 pathogenic Deafness, autosomal recessive 1A; Mutilating keratoderma; Hystrix-like ichthyosis with deafness; Keratitis-ichthyosis-deafness syndrome, autosomal dominant; Keratoderma palmoplantar deafness; Knuckle pads, deafness AND leukonychia syndrome; Deafness, autosomal dominant 3a; Deafness, X-linked 2 2017-05-18 criteria provided, single submitter clinical testing
Integrated Genetics/Laboratory Corporation of America RCV000018533 SCV000698257 pathogenic Deafness, autosomal recessive 1A 2016-04-21 criteria provided, single submitter clinical testing Variant summary: The c.427C>T variant affects a non-conserved nucleotide, resulting in amino acid change from Arg to Trp. 5/5 in-silico tools predict damaging outcome for this variant. This variant is found in 20/121442 control chromosomes at a frequency of 0.0001647, which does not exceed maximal expected frequency of a pathogenic allele (0.025). The variant of interest has been reported to be a common pathogenic variant predominantly found in Ghana (Hamelmann_2001). In addition, multiple clinical laboratories/reputable databases classified this variant as pathogenic. Taken together, this variant was classified as pathogenic.
Genomic Research Center, Shahid Beheshti University of Medical Sciences RCV000018533 SCV000784259 pathogenic Deafness, autosomal recessive 1A 2018-03-05 criteria provided, single submitter clinical testing
Invitae RCV000255157 SCV000939977 pathogenic not provided 2018-12-20 criteria provided, single submitter clinical testing This sequence change replaces arginine with tryptophan at codon 143 of the GJB2 protein (p.Arg143Trp). The arginine residue is highly conserved and there is a moderate physicochemical difference between arginine and tryptophan. This variant is present in population databases (rs80338948, ExAC 0.08%). This variant has been observed as homozygous or in combination with another GJB2 variant in individuals affected with hearing loss (PMID: 15365987, 19715472, 15617546, 18941476, 27792752, 23638949, 26061264). ClinVar contains an entry for this variant (Variation ID: 17009). Experimental studies have shown that this missense change causes a dominant negative effect on cell growth and reduction in cell death (PMID: 9393973, 15235031). For these reasons, this variant has been classified as Pathogenic.
Athena Diagnostics Inc RCV000255157 SCV001143669 pathogenic not provided 2019-03-01 criteria provided, single submitter clinical testing The best available variant frequency is uninformative because it is below the disease allele frequency. Statistically enriched in patients compared to ethnically matched controls. Found in at least one symptomatic patient. Predicted to have a damaging effect on the protein. Occurs in three or more cases with a recessive pathogenic variant in the same gene. Damaging to protein function(s) relevant to disease mechanism. Very strong co-segregation with disease, and data include affected and unaffected individuals from multiple families.
OMIM RCV000018533 SCV000038815 pathogenic Deafness, autosomal recessive 1A 2002-12-01 no assertion criteria provided literature only
GeneReviews RCV000018533 SCV000041048 pathologic Deafness, autosomal recessive 1A 2011-07-14 no assertion criteria provided curation Converted during submission to Pathogenic.
Counsyl RCV000018533 SCV000678056 pathogenic Deafness, autosomal recessive 1A 2017-06-16 no assertion criteria provided clinical testing
Clinical Molecular Genetics Laboratory,Johns Hopkins All Children's Hospital RCV000678885 SCV000805078 pathogenic Hearing loss 2014-10-02 no assertion criteria provided clinical testing
Genetic Testing Center for Deafness, Department of Otolaryngology Head & Neck Surgery,Institute of Otolaryngology, Chinese PLA General Hospital RCV000018533 SCV000902311 likely pathogenic Deafness, autosomal recessive 1A 2019-02-26 no assertion criteria provided case-control

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