NM_004004.6:c.139G>T
Variant summary
Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong
The NM_004004.6(GJB2):c.139G>T(p.Glu47*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00012 in 1,612,306 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 Pathogenic (★★).
Frequency
Consequence
NM_004004.6 stop_gained
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 16 ACMG points.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes AF: 0.000112 AC: 17AN: 152180Hom.: 0 Cov.: 33
GnomAD3 exomes AF: 0.000128 AC: 32AN: 250772Hom.: 0 AF XY: 0.000133 AC XY: 18AN XY: 135532
GnomAD4 exome AF: 0.000121 AC: 176AN: 1460126Hom.: 0 Cov.: 33 AF XY: 0.000113 AC XY: 82AN XY: 726012
GnomAD4 genome AF: 0.000112 AC: 17AN: 152180Hom.: 0 Cov.: 33 AF XY: 0.000108 AC XY: 8AN XY: 74354
ClinVar
Submissions by phenotype
not provided Pathogenic:10
The variant creates a premature nonsense codon, and is therefore predicted to result in the loss of a functional protein. Found in at least one symptomatic patient, and found in general population data that is consistent with pathogenicity. Occurs in three or more cases with a recessive pathogenic variant in the same gene. -
Nonsense variant predicted to result in protein truncation, as the last 180 amino acids are lost, and other loss-of-function variants have been reported downstream in the Human Gene Mutation Database (HGMD); This variant is associated with the following publications: (PMID: 9336442, 15070423, 32645618, 31589614, 29871260, 15964725, 30094485, 22429511, 29447821, 29625052, 30275481, 31160754, 33096615, 26553399, 21465647, 26990548, 27153395, 33105617) -
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The GJB2 c.139G>T; p.Glu47Ter variant (rs104894398) is reported multiple times in the literature in individuals with nonsyndromic hearing loss who are homozygous for the variant or compound heterozygous with another pathogenic GJB2 variant (Ben Said 2012, Denoyelle 1997, Dodson 2011, Rabionet 2000, Roux 2004). This variant is reported in ClinVar (Variation ID: 17005) and is found in the general population with an overall allele frequency of 0.01% (35/282166 alleles) in the Genome Aggregation Database. This variant induces an early termination codon and is predicted to result in a truncated protein or mRNA subject to nonsense-mediated decay. Based on available information, this variant is considered to be pathogenic. References: Ben Said M et al. Segregation of a new mutation in SLC26A4 and p.E47X mutation in GJB2 within a consanguineous Tunisian family affected with Pendred syndrome. Int J Pediatr Otorhinolaryngol. 2012 Jun;76(6):832-6. PMID: 22429511 Denoyelle F et al. Prelingual deafness: high prevalence of a 30delG mutation in the connexin 26 gene. Hum Mol Genet. 1997 Nov;6(12):2173-7. PMID: 9336442 Dodson KM et al. Vestibular dysfunction in DFNB1 deafness. Am J Med Genet A. 2011 May;155A(5):993-1000. PMID: 21465647 Rabionet R et al. Molecular basis of childhood deafness resulting from mutations in the GJB2 (connexin 26) gene. Hum Genet. 2000 Jan;106(1):40-4. PMID: 10982180 Roux AF et al. Molecular epidemiology of DFNB1 deafness in France. BMC Med Genet. 2004 Mar 6;5:5. PMID: 15070423 -
This sequence change creates a premature translational stop signal (p.Glu47*) in the GJB2 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 180 amino acid(s) of the GJB2 protein. This variant is present in population databases (rs104894398, gnomAD 0.04%). This premature translational stop signal has been observed in individuals with autosomal recessive non-syndromic hearing loss (PMID: 9336442, 15070423, 21465647, 22429511, 26553399). ClinVar contains an entry for this variant (Variation ID: 17005). For these reasons, this variant has been classified as Pathogenic. -
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Autosomal recessive nonsyndromic hearing loss 1A Pathogenic:9
NM_004004.5(GJB2):c.139G>T(E47*) is classified as pathogenic in the context of GJB2-related DFNB1 nonsyndromic hearing loss and deafness. Sources cited for classification include the following: PMID 21465647 and 17041943. Classification of NM_004004.5(GJB2):c.139G>T(E47*) is based on the following criteria: The variant causes a premature termination codon that is not expected to be targeted by nonsense-mediated mRNA decay; however, literature evidence strongly supports pathogenicity. Please note: this variant was assessed in the context of healthy population screening. -
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PVS1+PM2_Supporting+PM3_VeryStrong+PP1_Strong -
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Variant summary: The GJB2 c.139G>T (p.Glu47X) variant results in a premature termination codon, predicted to cause a truncated or absent GJB2 protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory (e.g. c.167delT, p.Leu56fsX26; c.169C>T, p.Gln57X; c.176_191delGCTGCAAGAACGTGTG, p.Gly59fsX18; c.235delC, p.Leu79fsX3). One in silico tool predicts a damaging outcome for this variant. The variant of interest has been found in a large, broad control population, ExAC in 23/128870 control chromosomes at a frequency of 0.0001785, which does not exceed the estimated maximal expected allele frequency of a pathogenic GJB2 variant (0.0003376). This variant is a common variant found in NSHL patients (homozygotes and compound heterozygotes) (Denoyelle_HMG_1997, Snoeckx_AJHG_2005, Dai_J Trans Med_2009), including one patient where it occurred as a trimutation, p.S19R/p.R32S/p.E47* (Martinez-Saucedo_IJPO_2015). In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as pathogenic. Taken together, this variant is classified as pathogenic. -
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This variant was identified in compound heterozygosity with a second variant in GJB2 in a male patient with congenital bilateral moderate hearing loss. -
Hearing impairment Pathogenic:2
PVS1_Strong, PS1_Strong, PM2_Moderate, PM3_Moderate, PM5_Moderate -
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Hearing loss Pathogenic:1
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Autosomal dominant keratitis-ichthyosis-hearing loss syndrome;C0265964:Mutilating keratoderma;C0266004:Knuckle pads, deafness AND leukonychia syndrome;C1835672:Palmoplantar keratoderma-deafness syndrome;C1865234:Ichthyosis, hystrix-like, with hearing loss;C2673759:Autosomal recessive nonsyndromic hearing loss 1A;C2675750:Autosomal dominant nonsyndromic hearing loss 3A Pathogenic:1
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Nonsyndromic genetic hearing loss Pathogenic:1
Based on ACMG/AMP guidelines and Hearing Loss Expert Panel specific criteria: the filtering allele frequency of the c.139 G>T (p.Glu47*) variant in the GJB2 gene is 0.02% (13/35412) of Latino chromosomes by the Genome Aggregation Database http://gnomad.broadinstitute.org; (calculated by using inverse allele frequency at ttps://www.cardiodb.org/allelefrequencyapp/), which meets the PM2_Supporting rule. The p.Glu47* variant is predicted to cause a premature stop codon in the only exon of GJB2 that leads to a truncated or absent protein in a gene in which loss-of-function is an established mechanism of disease (PVS1). This variant has been detected in patients with hearing loss in trans with at least 4 pathogenic or suspected-pathogenic variants (PM3_VeryStrong; PMID: 9336442, 10905664, 12910486, 14985372, 24158611). The c.139G>T variant meets criteria to be classified as pathogenic for autosomal recessive non-syndromic hearing loss: (PVS1, PM2_Supporting, PM3_VeryStrong). -
GJB2-related disorder Pathogenic:1
The GJB2 c.139G>T variant is predicted to result in premature protein termination (p.Glu47*). This variant has been reported to be causative for autosomal recessive sensorineural hearing loss (Denoyelle et al. 1997. PubMed ID: 9336442; Roux et al. 2004. PubMed ID: 15070423; Ben Said et al. 2012. PubMed ID: 22429511). This variant is reported in 0.037% of alleles in individuals of Latino descent in gnomAD. Nonsense variants in GJB2 are expected to be pathogenic. This variant is interpreted as pathogenic. -
Rare genetic deafness Pathogenic:1
The Glu47X variant has been reported in over 20 probands with hearing loss, many of whom were homozygous or compound heterozygous with another GJB2 variant (Kenna 2001, Kenna 2001, Abidi 2007, Denoyelle 1997, Ben Arab 2000, Chora 2010, Dalamón 2005, Marlin 2005, Masmoudi 2000, Neocleous 2006, Pallares-Ruiz 2002, Rabionet 2000, Ravecca 2005, Samanich 2007, Toth 2004, Wang 2009, Wu 2003). It has been identified in 0.03% (13/35412) of Latino chromosomes by gnomAD (http://gnomad.broadinstitute.org). This variant leads to a premature stop codon at position 47, which is predicted to lead to a truncated or absent protein. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive hearing loss. ACMG/AMP criteria applied: PVS1, PM3_VeryStrong. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at