NM_004004.6:c.110T>C

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM5_StrongPM3PP3

This summary comes from the ClinGen Evidence Repository: The c.1101T>C variant in GJB2 is a missense variant predicted to cause substitution of valine by alanine at amino acid 37 (p.Val37Ala). The highest population filtering allele frequency in gnomAD v4 is 0.03% (25/74924 alleles) in the African American population (PM2_Supporting, BA1, and BS1 not met). This variant has been identified in 11 heterozygous individuals who did not harbor a second variant in GJB2 (PMID 21287563, PMID 17666888, PMID 15365987,GeneDx Internal Data, Invitae Internal Data), but has also been detected in 1 patient with hearing loss in trans with a pathogenic variant (1 point, PM3; Partners LMM internal data SCV000967620.2, GeneDx Internal Data, Invitae Internal Data). The REVEL computational prediction analysis tool produced a score of 0.675, which rounded up to 0.7 is above the threshold necessary to apply PP3 (PP3). Two different pathogenic missense variants (p.Val37Ile and p.Val37Phe) have been previously identified at this codon of GJB2 which may indicate that this residue is critical to the function of the protein (PM5_Strong, p.Val37Ile ClinVar Variation ID 17023, PMID 31160754; p.Val37Phe ClinVar Variation ID:179256 PMID:37108562). In summary, this variant meets criteria to be classified as likely pathogenic for autosomal recessive nonsyndromic hearing loss based on the ACMG/AMP criteria applied as specified by the ClinGen Hearing Loss VCEP: PM3, PM5_Strong, PP3. (Hearing Loss VCEP specifications version 2; 4/22/2024) LINK:https://erepo.genome.network/evrepo/ui/classification/CA6904317/MONDO:0019497/005

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

GJB2
NM_004004.6 missense

Scores

Clinical Significance

Likely pathogenic reviewed by expert panel P:8

Conservation

PhyloP100: 9.26

Publications

8 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: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
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, G2P, Genomics England PanelApp
palmoplantar keratoderma-deafness syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P
syndromic genetic hearing loss
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
autosomal recessive nonsyndromic hearing loss 1A
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine
nonsyndromic genetic hearing loss
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
autosomal dominant keratitis-ichthyosis-hearing loss syndrome
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Genomics England PanelApp
autosomal dominant nonsyndromic hearing loss 3A
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
autosomal dominant nonsyndromic hearing loss
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
KID syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hearing loss, autosomal recessive
Inheritance: AR 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: Likely_pathogenic. The variant received 7 ACMG points.

PM3

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

PM5

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

PP3

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004004.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GJB2	NM_004004.6	MANE Select	c.110T>C	p.Val37Ala	missense	Exon 2 of 2	NP_003995.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
GJB2	ENST00000382848.5	TSL:1 MANE Select	c.110T>C	p.Val37Ala	missense	Exon 2 of 2	ENSP00000372299.4	P29033
GJB2	ENST00000382844.2	TSL:6	c.110T>C	p.Val37Ala	missense	Exon 1 of 1	ENSP00000372295.1	P29033
GJB2	ENST00000906230.1		c.110T>C	p.Val37Ala	missense	Exon 2 of 2	ENSP00000576289.1

Frequencies

GnomAD3 genomes

AF:

0.000138

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000338

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000458

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000757

AC:

AN:

250894

AF XY:

0.0000811

show subpopulations

Gnomad AFR exome

AF:

0.000431

Gnomad AMR exome

AF:

0.000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000226

AC:

AN:

1461482

Hom.:

Cov.:

AF XY:

0.0000234

AC XY:

AN XY:

726958

show subpopulations

African (AFR)

AF:

0.000329

AC:

AN:

33476

American (AMR)

AF:

0.000224

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.00

AC:

AN:

39688

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00000810

AC:

AN:

1111648

Other (OTH)

AF:

0.0000497

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.514

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:

0.000138

AC:

AN:

152174

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74350

show subpopulations

African (AFR)

AF:

0.000338

AC:

AN:

41448

American (AMR)

AF:

0.000458

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68036

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.506

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:

0.000113

Hom.:

Bravo

AF:

0.000121

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000494

AC:

ClinVar

ClinVar submissions

Significance:Likely pathogenic

Revision:reviewed by expert panel

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

Autosomal recessive nonsyndromic hearing loss 1A (2)

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 (1)

Nonsyndromic genetic hearing loss (1)

Rare genetic deafness (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.43

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.47

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Uncertain

0.76

Eigen

Uncertain

0.25

Eigen_PC

Benign

0.20

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.84

M_CAP

Pathogenic

0.39

MetaRNN

Pathogenic

0.86

MetaSVM

Pathogenic

1.0

MutationAssessor

Benign

1.5

PhyloP100

9.3

PrimateAI

Uncertain

0.62

PROVEAN

Uncertain

-3.3

REVEL

Pathogenic

0.68

Sift

Benign

0.20

Sift4G

Benign

0.58

Polyphen

1.0

Vest4

0.94

MVP

0.84

MPC

0.27

ClinPred

0.15

GERP RS

5.2

PromoterAI

-0.0010

Neutral

(source)

Varity_R

0.51

gMVP

0.91

Mutation Taster

=8/92

disease causing (ClinVar)

(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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over