rs80338946
Variant summary
Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1PP3_StrongPP5_Strong
The NM_004004.6(GJB2):c.339T>G(p.Ser113Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,236 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000048 ( 0 hom. )
Consequence
GJB2
NM_004004.6 missense
NM_004004.6 missense
Scores
2
4
12
Clinical Significance
Conservation
PhyloP100: -0.688
Genes affected
GJB2 (HGNC:4284): (gap junction protein beta 2) This gene encodes a member of the gap junction protein family. The gap junctions were first characterized by electron microscopy as regionally specialized structures on plasma membranes of contacting adherent cells. These structures were shown to consist of cell-to-cell channels that facilitate the transfer of ions and small molecules between cells. The gap junction proteins, also known as connexins, purified from fractions of enriched gap junctions from different tissues differ. According to sequence similarities at the nucleotide and amino acid levels, the gap junction proteins are divided into two categories, alpha and beta. Mutations in this gene are responsible for as much as 50% of pre-lingual, recessive deafness. [provided by RefSeq, Oct 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 10 ACMG points.
PM1
?
In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 8 uncertain in NM_004004.6
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.958
PP5
?
Variant 13-20189243-A-C is Pathogenic according to our data. Variant chr13-20189243-A-C is described in ClinVar as [Uncertain_significance]. Clinvar id is 21385.Status of the report is reviewed_by_expert_panel, 3 stars. We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=3, Uncertain_significance=2, not_provided=1}.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
GJB2 | NM_004004.6 | c.339T>G | p.Ser113Arg | missense_variant | 2/2 | ENST00000382848.5 | |
GJB2 | XM_011535049.3 | c.339T>G | p.Ser113Arg | missense_variant | 2/2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
GJB2 | ENST00000382848.5 | c.339T>G | p.Ser113Arg | missense_variant | 2/2 | 1 | NM_004004.6 | P1 | |
GJB2 | ENST00000382844.2 | c.339T>G | p.Ser113Arg | missense_variant | 1/1 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
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GnomAD3 exomes AF: 0.0000120 AC: 3AN: 250234Hom.: 0 AF XY: 0.0000148 AC XY: 2AN XY: 135352
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GnomAD4 exome AF: 0.00000479 AC: 7AN: 1461236Hom.: 0 Cov.: 33 AF XY: 0.00000413 AC XY: 3AN XY: 726926
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ClinVar
Significance: Uncertain significance
Submissions summary: Pathogenic:3Uncertain:2Other:1
Revision: reviewed by expert panel
LINK: link
Submissions by phenotype
Autosomal recessive nonsyndromic hearing loss 1A Pathogenic:1Uncertain:1Other:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | The GJB2 c.339T>G (p.Ser113Arg) missense variant has been reported in at least three studies in which it is found a total of four patients with an autosomal recessive form of nonsyndromic hearing loss, including in two in a compound heterozygous state and two in a heterozygous state where the zygosity of the variant is unknown (Kelly et al. 1998; Azaiez et al. 2004; Wang et al. 2013). The p.Ser113Arg variant was absent from 96 controls and is reported at a frequency of 0.00002 in the European (non-Finnish) population of the Exome Aggregation Consortium. This frequency is based on one allele only in a region of good sequence coverage so the variant is presumed to be rare. Functional studies in Xenopus oocytes demonstrated that the variant resulted in only background levels of junctional conductance and did not induce the formation of homotypic junctional channels (Bruzzone et al. 2003). Structural modelling experiments showed that the variant is located at a conserved site (Fan et al. 2012). Based on the available evidence the p.Ser113Arg variant is classified as likely pathogenic for an autosomal recessive form of nonsyndromic hearing loss. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Counsyl | Jun 13, 2017 | - - |
not provided, no classification provided | literature only | GeneReviews | - | - - |
Nonsyndromic genetic hearing loss Pathogenic:1Uncertain:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jan 17, 2023 | Variant summary: GJB2 c.339T>G (p.Ser113Arg) results in a non-conservative amino acid change located in the Connexin, N-terminal domain (IPR013092) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 250234 control chromosomes. c.339T>G has been reported in the literature as a compound heterozygous genotype in at-least two individuals reportedly affected with features of non syndromic hearing loss (NSHL) and as a non-informative genotype (second allele not specified) in many non syndromic hearing loss cohorts (example, Kelley_1998, McGuirt_2002, Gardner_2006, Snoeckx_2005, Wang_2013). These data indicate that the variant may be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function (Bruzzone_2003). The most pronounced variant effect results in loss of junctional conductance due to inability to form homotypic junctional channels. Two clinical diagnostic laboratories and an expert panel (ClinGen Hearing Loss Variant Curation Expert Panel) have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Multiple laboratories reported the variant with conflicting assessments (VUS, n=3 including the expert panel; Likely pathogenic, n=2) citing overlapping evidence utilized in the context of this evaluation. Based on the evidence outlined above, the variant was classified as likely pathogenic. - |
Uncertain significance, reviewed by expert panel | curation | ClinGen Hearing Loss Variant Curation Expert Panel | Jan 17, 2024 | The c.339T>G variant in GJB2 is a missense variant predicted to cause substitution of serine by arginine at amino acid 113. The highest population minor allele frequency in gnomAD v4.0.0 is 0.02% (7/26136 alleles) in the Ashkenazi Jewish population (PM2_Supporting, BS1, and BA1 are not met). The computational predictor REVEL provides a score of 0.553 which is neither above nor below the thresholds predicting a damaging or benign impact on GJB2 function (PP3 and BP4 are not met). An in vitro functional study performed in Xenopus oocytes showed that variant junctional conductance for p.Ser113Arg was similar to water (negative control), indicating a loss of function impact on protein function (PS3_Moderate; PMID:12505163). The p.Ser113Arg variant has been reported in several probands with hearing loss, including 3 individuals with a second pathogenic variant without phase confirmation (1.5 points, PM3, PMID: 15365987, 11439000, 9529365, 16380907, 24078562). In summary, this variant meets the criteria to be classified as a variant of uncertain significance for nonsyndromic genetic hearing loss based on the ACMG/AMP criteria applied, as specified by the ClinGen Hearing Loss VCEP: PS3_Moderate, PM3. (ClinGen Hearing Loss VCEP specifications version 2; 01/17/2024). - |
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | Dec 19, 2023 | This sequence change replaces serine, which is neutral and polar, with arginine, which is basic and polar, at codon 113 of the GJB2 protein (p.Ser113Arg). This variant is present in population databases (rs80338946, gnomAD 0.03%). This missense change has been observed in individual(s) with autosomal recessive non-syndromic deafness (PMID: 9529365, 12408072, 24078562). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 21385). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt GJB2 protein function with a negative predictive value of 95%. Experimental studies have shown that this missense change affects GJB2 function (PMID: 12505163). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
Cadd
Benign
Dann
Benign
DEOGEN2
Uncertain
D;D;D
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
N
M_CAP
Benign
T
MetaRNN
Pathogenic
D;D;D
MetaSVM
Uncertain
T
MutationAssessor
Benign
L;L;L
MutationTaster
Benign
A;A
PrimateAI
Benign
T
PROVEAN
Benign
N;N;.
REVEL
Uncertain
Sift
Benign
T;T;.
Sift4G
Benign
T;T;.
Polyphen
B;B;B
Vest4
MutPred
Gain of solvent accessibility (P = 0.0155);Gain of solvent accessibility (P = 0.0155);Gain of solvent accessibility (P = 0.0155);
MVP
MPC
ClinPred
T
GERP RS
Varity_R
gMVP
Splicing
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Calibrated prediction
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at