chrX-71223942-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000166.6(GJB1):c.235C>T(p.Leu79Leu) variant causes a synonymous change. The variant allele was found at a frequency of 0.00246 in 1,203,224 control chromosomes in the GnomAD database, including 3 homozygotes. There are 924 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0018 ( 0 hom., 55 hem., cov: 22)

Exomes 𝑓: 0.0025 ( 3 hom. 869 hem. )

Consequence

GJB1
NM_000166.6 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts U:2B:11

Conservation

PhyloP100: 5.00

Variant links:

Genes affected

GJB1 (HGNC:4283): (gap junction protein beta 1) This gene encodes a member of the gap junction protein family. The gap junction proteins are membrane-spanning proteins that assemble to form gap junction channels that facilitate the transfer of ions and small molecules between cells. 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 cause X-linked Charcot-Marie-Tooth disease, an inherited peripheral neuropathy. Alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Oct 2008]

GJB1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.51).

BP6

Variant X-71223942-C-T is Benign according to our data. Variant chrX-71223942-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 220932.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-71223942-C-T is described in Lovd as [Likely_benign]. Variant chrX-71223942-C-T is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00184 (205/111213) while in subpopulation NFE AF= 0.00266 (141/52947). AF 95% confidence interval is 0.00231. There are 0 homozygotes in gnomad4. There are 55 alleles in male gnomad4 subpopulation. Median coverage is 22. This position pass quality control queck.

BS2

High Hemizygotes in GnomAd4 at 55 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GJB1	NM_000166.6 link	c.235C>T	p.Leu79Leu	synonymous_variant	Exon 2 of 2	ENST00000361726.7	NP_000157.1	P08034A0A654ICJ7
GJB1	NM_001097642.3 link	c.235C>T	p.Leu79Leu	synonymous_variant	Exon 2 of 2		NP_001091111.1	P08034A0A654ICJ7
GJB1	XM_011530907.3 link	c.235C>T	p.Leu79Leu	synonymous_variant	Exon 2 of 2		XP_011529209.1	P08034A0A654ICJ7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GJB1	ENST00000361726.7 link	c.235C>T	p.Leu79Leu	synonymous_variant	Exon 2 of 2	1	NM_000166.6	ENSP00000354900.6		P08034

Frequencies

GnomAD3 genomes

AF:

0.00184

AC:

205

AN:

111161

Hom.:

Cov.:

AF XY:

0.00165

AC XY:

AN XY:

33393

show subpopulations

Gnomad AFR

AF:

0.000262

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000384

Gnomad ASJ

AF:

0.00944

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00400

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00266

Gnomad OTH

AF:

0.00200

GnomAD3 exomes

AF:

0.00237

AC:

396

AN:

167208

Hom.:

AF XY:

0.00216

AC XY:

117

AN XY:

54224

show subpopulations

Gnomad AFR exome

AF:

0.000408

Gnomad AMR exome

AF:

0.000812

Gnomad ASJ exome

AF:

0.00721

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00463

Gnomad NFE exome

AF:

0.00328

Gnomad OTH exome

AF:

0.00283

GnomAD4 exome

AF:

0.00252

AC:

2752

AN:

1092011

Hom.:

Cov.:

AF XY:

0.00243

AC XY:

869

AN XY:

358185

show subpopulations

Gnomad4 AFR exome

AF:

0.000494

Gnomad4 AMR exome

AF:

0.000817

Gnomad4 ASJ exome

AF:

0.00904

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00496

Gnomad4 NFE exome

AF:

0.00268

Gnomad4 OTH exome

AF:

0.00183

GnomAD4 genome

AF:

0.00184

AC:

205

AN:

111213

Hom.:

Cov.:

AF XY:

0.00164

AC XY:

AN XY:

33455

show subpopulations

Gnomad4 AFR

AF:

0.000261

Gnomad4 AMR

AF:

0.000383

Gnomad4 ASJ

AF:

0.00944

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00400

Gnomad4 NFE

AF:

0.00266

Gnomad4 OTH

AF:

0.00197

Alfa

AF:

0.00359

Hom.:

Bravo

AF:

0.00160

ClinVar

Significance: Benign/Likely benign

Submissions summary: Uncertain:2Benign:11

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:4

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Aug 01, 2020

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Charcot-Marie-Tooth disease X-linked dominant 1

Benign:3

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

May 18, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 27, 2021

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Uncertain:1Benign:1

Inherited Neuropathy Consortium

Significance: Uncertain significance

Review Status: flagged submission

Collection Method: literature only

- -

Dec 22, 2016

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Dejerine-Sottas disease

Uncertain:1

Inherited Neuropathy Consortium

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Inborn genetic diseases

Benign:1

Oct 21, 2014

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Charcot-Marie-Tooth Neuropathy X

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

GJB1-related disorder

Benign:1

Jun 24, 2019

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.51

CADD

Benign

8.6

DANN

Benign

0.72

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over