rs1555339539

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1PM2PM5PP2PP3_Moderate

The NM_021954.4(GJA3):c.82G>T(p.Val28Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000007 in 1,429,568 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V28M) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

GJA3
NM_021954.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.80

Publications

0 publications found

Variant links:

Genes affected

GJA3 (HGNC:4277): (gap junction protein alpha 3) The protein encoded by this gene is a connexin and is a component of lens fiber gap junctions. Defects in this gene are a cause of zonular pulverulent cataract type 3 (CZP3). [provided by RefSeq, Jan 2010]

GJA3 Gene-Disease associations (from GenCC):

cataract 14 multiple types
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
early-onset nuclear cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
early-onset posterior polar cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
pulverulent cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GJA3 links:

ENSG00000299362 (HGNC:):

ENSG00000299362 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_021954.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr13-20143207-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 468544.We mark this variant Likely_pathogenic, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 27 curated pathogenic missense variants (we use a threshold of 10). The gene has 6 curated benign missense variants. Gene score misZ: 1.7112 (below the threshold of 3.09). Trascript score misZ: -0.026578 (below the threshold of 3.09). GenCC associations: The gene is linked to early-onset nuclear cataract, pulverulent cataract, early-onset posterior polar cataract, cataract 14 multiple types.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.909

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GJA3	NM_021954.4 link	c.82G>T	p.Val28Leu	missense_variant	Exon 2 of 2	ENST00000241125.4	NP_068773.2	Q9Y6H8
GJA3	XM_011535048.3 link	c.82G>T	p.Val28Leu	missense_variant	Exon 2 of 2		XP_011533350.1	Q9Y6H8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GJA3	ENST00000241125.4 link	c.82G>T	p.Val28Leu	missense_variant	Exon 2 of 2	3	NM_021954.4	ENSP00000241125.3		Q9Y6H8
ENSG00000299362	ENST00000762843.1 link	n.133+5205C>A		intron_variant	Intron 1 of 1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.00e-7

AC:

AN:

1429568

Hom.:

Cov.:

AF XY:

0.00000142

AC XY:

AN XY:

706420

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33078

American (AMR)

AF:

0.0000232

AC:

AN:

43096

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23678

East Asian (EAS)

AF:

0.00

AC:

AN:

39388

South Asian (SAS)

AF:

0.00

AC:

AN:

79998

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51688

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5618

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1093992

Other (OTH)

AF:

0.00

AC:

AN:

59032

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Cataract 14 multiple types

Uncertain: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 GJA3 specific review of the literature in relation to pediatric or congenital cataract. ACMG-AMP criteria applied: PM1, PM2(Supporting), PP3. Original variant reports: PMID:32384692. Gene review and curation guidelines are outlined in: https://doi.org/10.1080/17469899.2023.2160320 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.37

BayesDel_noAF

Pathogenic

0.29

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.72

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.89

M_CAP

Pathogenic

0.68

MetaRNN

Pathogenic

0.91

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.1

PhyloP100

7.8

PrimateAI

Uncertain

0.71

PROVEAN

Uncertain

-2.8

REVEL

Pathogenic

0.83

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.65

MutPred

0.74

Gain of catalytic residue at F30 (P = 0.001);

MVP

0.97

MPC

2.0

ClinPred

0.99

GERP RS

5.6

Varity_R

0.91

gMVP

0.95

Mutation Taster

=16/84

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over