chr1-34785351-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_ModerateBP6

The NM_024009.3(GJB3):c.589G>A(p.Val197Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000719 in 1,613,358 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000073 ( 0 hom. )

Consequence

GJB3
NM_024009.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:1

Conservation

PhyloP100: -0.0260

Publications

3 publications found

Variant links:

Genes affected

GJB3 (HGNC:4285): (gap junction protein beta 3) This gene is a member of the connexin gene family. The encoded protein is a component of gap junctions, which are composed of arrays of intercellular channels that provide a route for the diffusion of low molecular weight materials from cell to cell. Mutations in this gene can cause non-syndromic deafness or erythrokeratodermia variabilis, a skin disorder. Alternative splicing results in multiple transcript variants encoding the same protein. [provided by RefSeq, Jul 2008]

GJB3 links:

SMIM12 (HGNC:25154): (small integral membrane protein 12) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

SMIM12 links:

ENSG00000255811 (HGNC:):

ENSG00000255811 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.07156438).

BP6

Variant 1-34785351-G-A is Benign according to our data. Variant chr1-34785351-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 46086.We mark this variant Likely_benign, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GJB3	NM_024009.3 link	c.589G>A	p.Val197Ile	missense_variant	Exon 2 of 2	ENST00000373366.3	NP_076872.1	O75712A0A654ICK0
GJB3	NM_001005752.2 link	c.589G>A	p.Val197Ile	missense_variant	Exon 2 of 2		NP_001005752.1	O75712A0A654ICK0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
GJB3	ENST00000373366.3 link	c.589G>A	p.Val197Ile	missense_variant	Exon 2 of 2	1	NM_024009.3	ENSP00000362464.2	O75712
GJB3	ENST00000373362.3 link	c.589G>A	p.Val197Ile	missense_variant	Exon 2 of 2	1		ENSP00000362460.3	O75712
SMIM12	ENST00000426886.1 link	n.208-66942C>T		intron_variant	Intron 2 of 4	1		ENSP00000429902.1	E5RH51
ENSG00000255811	ENST00000542839.1 link	n.110+2637C>T		intron_variant	Intron 1 of 1	5

Frequencies

GnomAD3 genomes

AF:

0.0000660

AC:

AN:

151576

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000485

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000195

Gnomad SAS

AF:

0.000418

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000736

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000477

AC:

AN:

251424

AF XY:

0.0000736

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000703

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000725

AC:

106

AN:

1461782

Hom.:

Cov.:

AF XY:

0.0000894

AC XY:

AN XY:

727192

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33478

American (AMR)

AF:

0.0000447

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000927

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53352

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000773

AC:

AN:

1111974

Other (OTH)

AF:

0.0000994

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000660

AC:

AN:

151576

Hom.:

Cov.:

AF XY:

0.0000811

AC XY:

AN XY:

74012

show subpopulations

African (AFR)

AF:

0.0000485

AC:

AN:

41206

American (AMR)

AF:

0.00

AC:

AN:

15194

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000195

AC:

AN:

5126

South Asian (SAS)

AF:

0.000418

AC:

AN:

4788

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10562

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.0000736

AC:

AN:

67930

Other (OTH)

AF:

0.00

AC:

AN:

2074

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.520

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000823

Hom.:

Bravo

AF:

0.0000453

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Jun 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 197 of the GJB3 protein (p.Val197Ile). This variant is present in population databases (rs376506263, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with GJB3-related conditions. ClinVar contains an entry for this variant (Variation ID: 46086). 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 GJB3 protein function with a negative predictive value of 80%. 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. -

Jul 18, 2017

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Val197Ile variant (rs376506263) has not been reported in the medical literature, nor has it been previously identified in our laboratory; however, it is listed in the ClinVar database (Variation ID: 46086). It is listed in the Genome Aggregation Database (gnomAD) browser with an overall frequency of 0.004% (identified in 11 out of 277,074 chromosomes). The valine at codon 197 is moderately conserved considering 13 species (Alamut software v2.9), and several species including Rhesus macaque have an isoleucine at this position, suggested this variant is evolutionary tolerated. Additionally, computational analyses suggest this variant does not have a significant effect on GJB3protein structure/function (SIFT: tolerated, PolyPhen2: benign, and Mutation Taster: polymorphism). However, based on the available information, the clinical significance of the p.Val197Ile variant cannot be determined with certainty. -

not specified

Benign:1

Mar 04, 2013

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Val197Ile variant in exon 2 of GJB3: This variant is not expected to have clinic al significance due to lack of conservation across mammals and distant species. Of note, several mammals including primates (rhesus monkey and baboon) have an i soleucine (Ile) at this position. In addition, computational analyses (biochemic al amino acid properties, homology, PolyPhen2, SIFT, AlignGVGD) suggest the vari ant may not impact the protein. This variant has been identified in 1/8600 (0.01 %) European American chromosomes by the NHLBI Exome Sequencing Project (http:// evs.gs.washington.edu/EVS). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.072

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.32

CADD

Benign

6.0

(source)

DANN

Benign

0.76

DEOGEN2

Benign

0.41

T;T

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.73

.;T

M_CAP

Benign

0.058

MetaRNN

Benign

0.072

T;T

MetaSVM

Benign

-0.42

MutationAssessor

Benign

0.27

N;N

PhyloP100

-0.026

PrimateAI

Benign

0.24

PROVEAN

Benign

0.34

N;N

REVEL

Uncertain

0.30

Sift

Benign

1.0

T;T

Sift4G

Benign

1.0

T;T

Polyphen

0.046

B;B

Vest4

0.039

MVP

0.50

MPC

0.057

ClinPred

0.015

GERP RS

0.76

Varity_R

0.039

gMVP

0.35

Mutation Taster

=89/11

polymorphism

(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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chr1-34785351-G-A

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