rs749693224
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM5PP3_ModeratePP5
The ENST00000382848.5(GJB2):āc.60T>Gā(p.Ile20Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000155 in 1,613,978 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I20T) has been classified as Likely pathogenic.
Frequency
Consequence
ENST00000382848.5 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_pathogenic. Variant got 7 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
GJB2 | NM_004004.6 | c.60T>G | p.Ile20Met | missense_variant | 2/2 | ENST00000382848.5 | NP_003995.2 | |
GJB2 | XM_011535049.3 | c.60T>G | p.Ile20Met | missense_variant | 2/2 | XP_011533351.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
GJB2 | ENST00000382848.5 | c.60T>G | p.Ile20Met | missense_variant | 2/2 | 1 | NM_004004.6 | ENSP00000372299 | P1 | |
GJB2 | ENST00000382844.2 | c.60T>G | p.Ile20Met | missense_variant | 1/1 | ENSP00000372295 | P1 |
Frequencies
GnomAD3 genomes AF: 0.00000657 AC: 1AN: 152168Hom.: 0 Cov.: 33
GnomAD3 exomes AF: 0.0000360 AC: 9AN: 249864Hom.: 0 AF XY: 0.0000518 AC XY: 7AN XY: 135200
GnomAD4 exome AF: 0.0000164 AC: 24AN: 1461810Hom.: 0 Cov.: 33 AF XY: 0.0000165 AC XY: 12AN XY: 727208
GnomAD4 genome AF: 0.00000657 AC: 1AN: 152168Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0AN XY: 74346
ClinVar
Submissions by phenotype
Autosomal recessive nonsyndromic hearing loss 1A Uncertain:3
Uncertain significance, criteria provided, single submitter | clinical testing | Counsyl | Jan 31, 2018 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia | May 09, 2017 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. - |
Autosomal dominant nonsyndromic hearing loss 3A Pathogenic:1Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. - |
Pathogenic, criteria provided, single submitter | research | Laboratory of Prof. Karen Avraham, Tel Aviv University | Nov 25, 2024 | The p.(Ile20Met) variant was detected in five compound heterozygous probands, three for p.I20M/c.167delT and two for p.I20M/c.35delG, all of them with mild-moderate HL. Segregation analysis in these families supported pathogenicity of the variant. Another proband with compound heterozygosity for p.I20M/p.V37I reported normal hearing but refused to have his hearing tested. - |
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 15, 2024 | This sequence change replaces isoleucine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 20 of the GJB2 protein (p.Ile20Met). This variant is present in population databases (rs749693224, gnomAD 0.08%). This missense change has been observed in individual(s) with deafness (PMID: 12172394, 12910486, 17666888; Invitae). 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: 438615). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on GJB2 protein function. This variant disrupts the p.Ile20 amino acid residue in GJB2. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 11313763, 12189487, 16217030, 16380907). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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. - |
Ichthyosis, hystrix-like, with hearing loss Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at