rs773846324

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

This summary comes from the ClinGen Evidence Repository: The c.677T>G variant in GJB2 is a missense variant predicted to cause substitution of valine to glycine at amino acid 226. The highest population minor allele frequency in gnomAD v2.1.1 is 0.003% (1/35370) in Latino/Admixed American chromosomes, which is below the PM2_Supporting thresholds defined by the ClinGen Hearing Loss Expert Panel (≤0.007%) for autosomal recessive disorders (PM2_Supporting). The computational predictor REVEL gives a score of 0.586 which is neither above nor below the thresholds predicting a damaging or benign impact on USH2A function (no criteria met). It has been reported in the literature in one heterozygous individual with hearing loss; however, a second variant was not identified and there was no reported family history of hearing loss (no criteria met; PMID:17666888). This variant has been reported by several clinical laboratories in ClinVar as a variant of uncertain significance (ClinVar Variation ID: 447450). Internal laboratory evidence indicates that the variant has been identified in at least three individuals with hearing loss in the heterozygous state without a second GJB2 variant. One individual was reported to have multiple affected relatives; however, segregation data was not available (no criteria met; SCV000613524.1, SCV000731317.1, SCV002817016.1, SCV002179797.2). In summary, this variant is classified as a variant of uncertain significance based on the ACMG/AMP criteria applied, as specified by the ClinGen Hearing Loss VCEP; PM2_Supporting. The ClinGen Hearing Loss VCEP Specifications Version 2; 09/26/2023. LINK:https://erepo.genome.network/evrepo/ui/classification/CA6904209/MONDO:0019497/005

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000025 ( 0 hom. )

Consequence

GJB2
NM_004004.6 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:7

Conservation

PhyloP100: 2.04

Publications

2 publications found

Variant links:

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]

GJB2 Gene-Disease associations (from GenCC):

Bart-Pumphrey syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
ichthyosis, hystrix-like, with hearing loss
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp
keratoderma hereditarium mutilans
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P
palmoplantar keratoderma-deafness syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, G2P
autosomal recessive nonsyndromic hearing loss 1A
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, G2P, PanelApp Australia
hearing loss, autosomal recessive
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
autosomal dominant keratitis-ichthyosis-hearing loss syndrome
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, Ambry Genetics
autosomal dominant nonsyndromic hearing loss 3A
Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
autosomal dominant nonsyndromic hearing loss
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
KID syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GJB2 links:

ENSG00000296095 (HGNC:):

ENSG00000296095 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GJB2	NM_004004.6 link	c.677T>G	p.Val226Gly	missense_variant	Exon 2 of 2	ENST00000382848.5	NP_003995.2	P29033H9U1J4
GJB2	XM_011535049.3 link	c.677T>G	p.Val226Gly	missense_variant	Exon 2 of 2		XP_011533351.1	P29033H9U1J4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
GJB2	ENST00000382848.5 link	c.677T>G	p.Val226Gly	missense_variant	Exon 2 of 2	1	NM_004004.6	ENSP00000372299.4	P29033
GJB2	ENST00000382844.2 link	c.677T>G	p.Val226Gly	missense_variant	Exon 1 of 1	6		ENSP00000372295.1	P29033
ENSG00000296095	ENST00000736390.1 link	n.232-3325T>G		intron_variant	Intron 1 of 3

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152196

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000807

AC:

AN:

247688

AF XY:

0.00000743

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000899

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000253

AC:

AN:

1460126

Hom.:

Cov.:

AF XY:

0.0000262

AC XY:

AN XY:

726460

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33452

American (AMR)

AF:

0.0000447

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86238

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52456

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000297

AC:

AN:

1111304

Other (OTH)

AF:

0.00

AC:

AN:

60360

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152196

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74350

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41452

American (AMR)

AF:

0.00

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5198

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68036

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.442

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000610

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.00000825

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Uncertain:2

Sep 30, 2016

Athena Diagnostics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 28, 2017

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Val226Gly variant in GJB2 has been reported in the heterozygous state in o ne individual with hearing loss (Putcha 2007). This variant has been identified in 1/11448 Latino chromosomes by the Exome Aggregation Consortium (ExAC, http:// exac.broadinstitute.org; dbSNP rs773846324). Although this variant has been seen in the general population, its frequency is not high enough to rule out a patho genic role. Computational prediction tools and conservation analysis do not prov ide strong support for or against an impact to the protein. In summary, the clin ical significance of the p.Val226Gly variant is uncertain. -

Autosomal recessive nonsyndromic hearing loss 1A

Uncertain:2

Aug 31, 2020

Natera, Inc.

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jan 04, 2017

Counsyl

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Nonsyndromic genetic hearing loss

Uncertain:1

Sep 26, 2023

ClinGen Hearing Loss Variant Curation Expert Panel

Significance:Uncertain significance

Review Status:reviewed by expert panel

Collection Method:curation

The c.677T>G variant in GJB2 is a missense variant predicted to cause substitution of valine to glycine at amino acid 226. The highest population minor allele frequency in gnomAD v2.1.1 is 0.003% (1/35370) in Latino/Admixed American chromosomes, which is below the PM2_Supporting thresholds defined by the ClinGen Hearing Loss Expert Panel (less than or equal to 0.007%) for autosomal recessive disorders (PM2_Supporting). The computational predictor REVEL gives a score of 0.586 which is neither above nor below the thresholds predicting a damaging or benign impact on USH2A function (no criteria met). It has been reported in the literature in one heterozygous individual with hearing loss; however, a second variant was not identified and there was no reported family history of hearing loss (no criteria met; PMID: 17666888). This variant has been reported by several clinical laboratories in ClinVar as a variant of uncertain significance (ClinVar Variation ID: 447450). Internal laboratory evidence indicates that the variant has been identified in at least three individuals with hearing loss in the heterozygous state without a second GJB2 variant. One individual was reported to have multiple affected relatives; however, segregation data was not available (no criteria met; SCV000613524.1, SCV000731317.1, SCV002817016.1, SCV002179797.2). In summary, this variant is classified as a variant of uncertain significance based on the ACMG/AMP criteria applied, as specified by the ClinGen Hearing Loss VCEP; PM2_Supporting. The ClinGen Hearing Loss VCEP Specifications Version 2; 09/26/2023. -

not provided

Uncertain:1

Sep 24, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces valine with glycine at codon 226 of the GJB2 protein (p.Val226Gly). The valine residue is highly conserved and there is a moderate physicochemical difference between valine and glycine. This variant is present in population databases (rs773846324, ExAC 0.009%). This variant has been observed in individual(s) with deafness (PMID: 20201936; Invitae). ClinVar contains an entry for this variant (Variation ID: 447450). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C15"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Autosomal dominant keratitis-ichthyosis-hearing loss syndrome;C0265964:Mutilating keratoderma;C0266004:Knuckle pads, deafness AND leukonychia syndrome;C1835672:Palmoplantar keratoderma-deafness syndrome;C1844678:X-linked mixed hearing loss with perilymphatic gusher;C1865234:Ichthyosis, hystrix-like, with hearing loss;C2673759:Autosomal recessive nonsyndromic hearing loss 1A;C2675750:Autosomal dominant nonsyndromic hearing loss 3A

Uncertain:1

Oct 05, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Pathogenic

0.29

BayesDel_noAF

Pathogenic

0.27

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.13

T;T;T

Eigen

Benign

-0.28

Eigen_PC

Benign

-0.15

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.57

.;.;T

M_CAP

Uncertain

0.22

MetaRNN

Pathogenic

0.82

D;D;D

MetaSVM

Uncertain

0.36

MutationAssessor

Benign

-0.34

N;N;N

PhyloP100

2.0

PrimateAI

Benign

0.47

PROVEAN

Benign

0.53

N;N;.

REVEL

Uncertain

0.59

Sift

Uncertain

0.0010

D;D;.

Sift4G

Pathogenic

0.0010

D;D;.

Polyphen

0.40

B;B;B

Vest4

0.80

MutPred

0.83

Loss of stability (P = 0.0235);Loss of stability (P = 0.0235);Loss of stability (P = 0.0235);

MVP

0.53

MPC

0.050

ClinPred

0.23

GERP RS

4.8

Varity_R

0.18

gMVP

0.88

Mutation Taster

=15/85

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over