chr3-184353341-C-G

Position:

• chr3-184353341-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The ENST00000265593.9(CLCN2):​c.1937G>C​(p.Arg646Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,042 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R646Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CLCN2 ENST00000265593.9 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.75

Genes affected

CLCN2 (HGNC:2020): (chloride voltage-gated channel 2) This gene encodes a voltage-gated chloride channel. The encoded protein is a transmembrane protein that maintains chloride ion homeostasis in various cells. Defects in this gene may be a cause of certain epilepsies. Four transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLCN2	NM_004366.6	c.1937G>C	p.Arg646Pro	missense_variant	17/24	ENST00000265593.9	NP_004357.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CLCN2	ENST00000265593.9	c.1937G>C	p.Arg646Pro	missense_variant	17/24	1	NM_004366.6	ENSP00000265593	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250442 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135568

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: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000885

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461042 Hom.: 0 Cov.: 36 AF XY: 0.00000138 AC XY: 1 AN XY: 726820

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.82
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.27	T;.;.;.
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.84	T;T;T;T
M_CAP	Uncertain	0.14	D
MetaRNN	Uncertain	0.54	D;D;D;D
MetaSVM	Uncertain	0.27	D
MutationAssessor	Benign	1.9	L;.;.;L
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-2.7	D;D;D;D
REVEL	Uncertain	0.49
Sift	Benign	0.10	T;T;T;T
Sift4G	Benign	0.30	T;T;T;T
Polyphen		0.96	D;P;.;.
Vest4		0.40
MutPred		0.31		Loss of MoRF binding (P = 0.0053);.;.;Loss of MoRF binding (P = 0.0053);
MVP		0.97
MPC		0.56
ClinPred		0.94	D
GERP RS		5.6
Varity_R		0.55
gMVP		0.66

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: rs115961753; hg19: chr3-184071129;