chr1-34784887-G-C

Position:

• chr1-34784887-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_024009.3(GJB3):​c.125G>C​(p.Arg42Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. R42R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GJB3 NM_024009.3 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 3.09

Genes affected

GJB3 (HGNC:4285): (gap junction protein beta 3) 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. Mutations in this gene can cause non-syndromic deafness or erythrokeratodermia variabilis, a skin disorder. Alternative splicing results in multiple transcript variants encoding the same protein. [provided by RefSeq, Jul 2008]

SMIM12 (HGNC:25154): (small integral membrane protein 12) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

ENSG00000255811 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 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 1 benign, 6 uncertain in NM_024009.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.984
• PP5: Variant 1-34784887-G-C is Pathogenic according to our data. Variant chr1-34784887-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 6489.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr1-34784887-G-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GJB3	NM_024009.3	c.125G>C	p.Arg42Pro	missense_variant	2/2	ENST00000373366.3	NP_076872.1
GJB3	NM_001005752.2	c.125G>C	p.Arg42Pro	missense_variant	2/2		NP_001005752.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GJB3	ENST00000373366.3	c.125G>C	p.Arg42Pro	missense_variant	2/2	1	NM_024009.3	ENSP00000362464.2
GJB3	ENST00000373362.3	c.125G>C	p.Arg42Pro	missense_variant	2/2	1		ENSP00000362460.3
SMIM12	ENST00000426886.1	n.208-66478C>G		intron_variant		1		ENSP00000429902.1
ENSG00000255811	ENST00000542839.1	n.110+3101C>G		intron_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Erythrokeratodermia variabilis et progressiva 1 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Mar 01, 2000

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.42
CADD	Uncertain	23
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.76	D;D
Eigen	Benign	0.092
Eigen_PC	Benign	0.044
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.73	.;T
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.0	M;M
PrimateAI	Uncertain	0.66	T
PROVEAN	Uncertain	-3.5	D;D
REVEL	Pathogenic	0.78
Sift	Benign	0.047	D;D
Sift4G	Uncertain	0.042	D;D
Polyphen		0.98	D;D
Vest4		0.90
MutPred		0.84		Gain of sheet (P = 0.1208);Gain of sheet (P = 0.1208);
MVP		0.93
MPC		0.46
ClinPred		0.97	D
GERP RS		4.0
Varity_R		0.87
gMVP		0.88

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

Other links and lift over

dbSNP: rs74315321; hg19: chr1-35250488;