rs142415337

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 3P and 16B. PM1PP2BP4_StrongBP6_Very_StrongBS1

The NM_005267.5(GJA8):c.385G>A(p.Val129Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0012 in 1,614,202 control chromosomes in the GnomAD database, including 1 homozygotes. 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 Likely benign (★★).

Frequency

Genomes: 𝑓 0.00068 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0013 ( 1 hom. )

Consequence

GJA8
NM_005267.5 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: 0.927

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

cataract 1 multiple types
Inheritance: AD, AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
cataract - microcornea syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
early-onset nuclear cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
early-onset sutural cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
pulverulent cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
total early-onset cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GJA8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

PM1

In a disulfide_bond (size 140) in uniprot entity CXA8_HUMAN there are 31 pathogenic changes around while only 3 benign (91%) in NM_005267.5

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 49 curated pathogenic missense variants (we use a threshold of 10). The gene has 13 curated benign missense variants. Trascript score misZ: -0.35816 (below the threshold of 3.09). GenCC associations: The gene is linked to cataract 1 multiple types, cataract - microcornea syndrome, early-onset nuclear cataract, early-onset sutural cataract, pulverulent cataract, total early-onset cataract.

BP4

Computational evidence support a benign effect (MetaRNN=0.01220268).

BP6

Variant 1-147908340-G-A is Benign according to our data. Variant chr1-147908340-G-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 292466.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000676 (103/152328) while in subpopulation NFE AF = 0.00112 (76/68018). AF 95% confidence interval is 0.000915. There are 0 homozygotes in GnomAd4. There are 48 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GJA8	NM_005267.5 link	c.385G>A	p.Val129Ile	missense_variant	Exon 2 of 2	ENST00000369235.2	NP_005258.2	P48165X5D7G1
GJA8	XM_011509417.3 link	c.385G>A	p.Val129Ile	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.385G>A	p.Val129Ile	missense_variant	Exon 2 of 2	6	NM_005267.5	ENSP00000358238.1		P48165

Frequencies

GnomAD3 genomes

AF:

0.000677

AC:

103

AN:

152210

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

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:

0.000847

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00112

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000816

AC:

205

AN:

251334

AF XY:

0.000846

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000665

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00148

Gnomad NFE exome

AF:

0.00123

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00125

AC:

1833

AN:

1461874

Hom.:

Cov.:

AF XY:

0.00124

AC XY:

900

AN XY:

727240

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.000604

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000232

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00112

AC:

AN:

53404

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00150

AC:

1668

AN:

1112012

Other (OTH)

AF:

0.000927

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

114

228

342

456

570

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

128

192

256

320

<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:

0.000676

AC:

103

AN:

152328

Hom.:

Cov.:

AF XY:

0.000644

AC XY:

AN XY:

74492

show subpopulations

African (AFR)

AF:

0.000241

AC:

AN:

41574

American (AMR)

AF:

0.000457

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.000847

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00112

AC:

AN:

68018

Other (OTH)

AF:

0.000473

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

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:

0.00103

Hom.:

Bravo

AF:

0.000589

TwinsUK

AF:

0.00135

AC:

ALSPAC

AF:

0.00156

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000814

AC:

ExAC

AF:

0.000733

AC:

EpiCase

AF:

0.00125

EpiControl

AF:

0.000948

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Cataract 1 multiple types

Benign:2

Sep 09, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided

Benign:1

Jun 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

GJA8: BS1, BS2 -

Zonular Pulverulent Cataract

Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.067

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.42

CADD

Benign

0.21

(source)

DANN

Benign

0.69

DEOGEN2

Uncertain

0.51

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.64

LIST_S2

Benign

0.13

M_CAP

Benign

0.028

MetaRNN

Benign

0.012

MetaSVM

Benign

-0.35

MutationAssessor

Benign

-0.34

PhyloP100

0.93

PrimateAI

Benign

0.34

PROVEAN

Benign

-0.14

REVEL

Uncertain

0.31

Sift

Benign

0.71

Sift4G

Benign

0.40

Polyphen

0.0010

Vest4

0.031

MVP

0.52

ClinPred

0.0030

GERP RS

-5.6

Varity_R

0.023

gMVP

0.39

Mutation Taster

=95/5

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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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