6-121446894-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1PM2PP2

The NM_000165.5(GJA1):c.47C>G(p.Ala16Gly) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,508 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

GJA1
NM_000165.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.08

Variant links:

Genes affected

GJA1 (HGNC:4274): (gap junction protein alpha 1) 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. The encoded protein is the major protein of gap junctions in the heart that are thought to have a crucial role in the synchronized contraction of the heart and in embryonic development. A related intronless pseudogene has been mapped to chromosome 5. Mutations in this gene have been associated with oculodentodigital dysplasia, autosomal recessive craniometaphyseal dysplasia and heart malformations. [provided by RefSeq, May 2014]

GJA1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM1

In a topological_domain Cytoplasmic (size 21) in uniprot entity CXA1_HUMAN there are 7 pathogenic changes around while only 0 benign (100%) in NM_000165.5

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the GJA1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 41 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 1.2784 (below the threshold of 3.09). Trascript score misZ: 3.3775 (above the threshold of 3.09). GenCC associations: The gene is linked to craniometaphyseal dysplasia, autosomal recessive, Hallermann-Streiff syndrome, syndactyly type 3, oculodentodigital dysplasia, nonsyndromic genetic hearing loss, hypoplastic left heart syndrome 1, autosomal dominant palmoplantar keratoderma and congenital alopecia, oculodentodigital dysplasia, autosomal recessive, craniometaphyseal dysplasia, erythrokeratodermia variabilis et progressiva 3, erythrokeratodermia variabilis.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GJA1	NM_000165.5 link	c.47C>G	p.Ala16Gly	missense_variant	Exon 2 of 2	ENST00000282561.4	NP_000156.1	P17302A0A654IBU3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
GJA1	ENST00000282561.4 link	c.47C>G	p.Ala16Gly	missense_variant	Exon 2 of 2	1	NM_000165.5	ENSP00000282561.3	P17302
GJA1	ENST00000647564.1 link	c.47C>G	p.Ala16Gly	missense_variant	Exon 2 of 2			ENSP00000497565.1	P17302
GJA1	ENST00000649003.1 link	c.47C>G	p.Ala16Gly	missense_variant	Exon 2 of 2			ENSP00000497283.1	P17302
GJA1	ENST00000650427.1 link	c.47C>G	p.Ala16Gly	missense_variant	Exon 2 of 2			ENSP00000497367.1	P17302

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251402

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135884

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461508

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727108

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 04, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: GJA1 c.47C>G (p.Ala16Gly) results in a non-conservative amino acid change located in the Connexin, N-terminal domain (IPR013092) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 251402 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.47C>G in individuals affected with Oculodentodigital Dysplasia and no experimental evidence demonstrating its impact on protein function have been reported. No submitters have cited clinical-significance assessments for this variant to ClinVar. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.61

BayesDel_addAF

Uncertain

0.074

BayesDel_noAF

Uncertain

-0.030

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.75

D;D;D;D;D

Eigen

Uncertain

0.51

Eigen_PC

Uncertain

0.55

FATHMM_MKL

Uncertain

0.90

LIST_S2

Benign

0.81

.;.;.;.;T

M_CAP

Pathogenic

0.32

MetaRNN

Uncertain

0.72

D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

0.90

L;L;L;L;L

PrimateAI

Pathogenic

0.82

PROVEAN

Benign

-1.3

.;.;N;.;.

REVEL

Pathogenic

0.67

Sift

Benign

0.051

.;.;T;.;.

Sift4G

Uncertain

0.028

.;.;D;.;.

Polyphen

0.97

D;D;D;D;D

Vest4

0.58

MutPred

0.46

Loss of ubiquitination at K13 (P = 0.0863);Loss of ubiquitination at K13 (P = 0.0863);Loss of ubiquitination at K13 (P = 0.0863);Loss of ubiquitination at K13 (P = 0.0863);Loss of ubiquitination at K13 (P = 0.0863);

MVP

0.98

MPC

0.51

ClinPred

0.65

GERP RS

5.3

Varity_R

0.36

gMVP

0.70

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