1-147907974-C-A

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 2P and 6B. PM5BP4BP6BS1

The NM_005267.5(GJA8):c.19C>A(p.Leu7Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000143 in 1,614,024 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L7P) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.00076 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000079 ( 0 hom. )

Consequence

GJA8
NM_005267.5 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 2.02

Variant links:

Genes affected

GJA8 (HGNC:4281): (gap junction protein alpha 8) This gene encodes a transmembrane connexin protein that is necessary for lens growth and maturation of lens fiber cells. The encoded protein is a component of gap junction channels and functions in a calcium and pH-dependent manner. Mutations in this gene have been associated with zonular pulverulent cataracts, nuclear progressive cataracts, and cataract-microcornea syndrome. [provided by RefSeq, Dec 2009]

GJA8 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-147907975-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 2733979.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1}.

BP4

Computational evidence support a benign effect (MetaRNN=0.37018546).

BP6

Variant 1-147907974-C-A is Benign according to our data. Variant chr1-147907974-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 772629.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000762 (116/152272) while in subpopulation AFR AF= 0.00265 (110/41564). AF 95% confidence interval is 0.00224. There are 1 homozygotes in gnomad4. There are 55 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GJA8	NM_005267.5 link	c.19C>A	p.Leu7Met	missense_variant	Exon 2 of 2	ENST00000369235.2	NP_005258.2	P48165X5D7G1
GJA8	XM_011509417.3 link	c.19C>A	p.Leu7Met	missense_variant	Exon 1 of 2		XP_011507719.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GJA8	ENST00000369235.2 link	c.19C>A	p.Leu7Met	missense_variant	Exon 2 of 2	6	NM_005267.5	ENSP00000358238.1		P48165

Frequencies

GnomAD3 genomes

AF:

0.000769

AC:

117

AN:

152154

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00268

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

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:

0.000478

GnomAD3 exomes

AF:

0.000175

AC:

AN:

251418

Hom.:

AF XY:

0.000147

AC XY:

AN XY:

135900

show subpopulations

Gnomad AFR exome

AF:

0.00234

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000980

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000787

AC:

115

AN:

1461752

Hom.:

Cov.:

AF XY:

0.0000715

AC XY:

AN XY:

727194

show subpopulations

Gnomad4 AFR exome

AF:

0.00272

Gnomad4 AMR exome

AF:

0.0000894

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.000248

GnomAD4 genome

AF:

0.000762

AC:

116

AN:

152272

Hom.:

Cov.:

AF XY:

0.000739

AC XY:

AN XY:

74444

show subpopulations

Gnomad4 AFR

AF:

0.00265

Gnomad4 AMR

AF:

0.000327

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000133

Hom.:

Bravo

AF:

0.000812

ESP6500AA

AF:

0.00204

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000181

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Cataract 1 multiple types

Uncertain:1Benign:1

Jan 21, 2023

Dept. Genetics and Cancer, Menzies Institute for Medical Research, University of Tasmania

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

Variant identified and curated during a GJA8 specific review of the literature in relation to pediatric or congenital cataract. ACMG-AMP criteria applied: BS1(Moderate), PM1(Supporting), PP3. Original variant report: PMID:29464339. No cataract phenotype reported for this proband, additional reported phenotypes in the individual are; Microphthalmia, retinal detachment, heart anomaly, absent left kidney, septum pellucidum abnormality. Gene review and curation guidelines are outlined in: https://doi.org/10.1080/17469899.2023.2160320 -

Dec 31, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

GJA8-related disorder

Benign:1

Jun 05, 2020

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely 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

AlphaMissense

Pathogenic

0.77

BayesDel_addAF

Benign

-0.036

BayesDel_noAF

Pathogenic

0.17

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.88

Eigen

Pathogenic

0.77

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.97

M_CAP

Pathogenic

0.74

MetaRNN

Benign

0.37

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.6

PrimateAI

Pathogenic

0.90

PROVEAN

Benign

-1.7

REVEL

Pathogenic

0.80

Sift

Uncertain

0.0020

Sift4G

Pathogenic

0.0

Polyphen

0.99

Vest4

0.81

MVP

0.91

ClinPred

0.20

GERP RS

4.3

Varity_R

0.62

gMVP

0.90

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