Genetic Variant CLCN2:p.Arg577Leu (chr3-184353787-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_004366.6(CLCN2):c.1730G>T(p.Arg577Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000688 in 1,453,824 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. R577Q) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 30)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

CLCN2
NM_004366.6 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.01

Publications

0 publications found

Variant links:

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]

CLCN2 Gene-Disease associations (from GenCC):

leukoencephalopathy with mild cerebellar ataxia and white matter edema
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics
epilepsy, idiopathic generalized, susceptibility to, 11
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
familial hyperaldosteronism type II
Inheritance: AD Classification: MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet
epilepsy
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

CLCN2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLCN2	NM_004366.6 link	c.1730G>T	p.Arg577Leu	missense_variant	Exon 16 of 24	ENST00000265593.9	NP_004357.3	P51788-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLCN2	ENST00000265593.9 link	c.1730G>T	p.Arg577Leu	missense_variant	Exon 16 of 24	1	NM_004366.6	ENSP00000265593.4		P51788-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.88e-7

AC:

AN:

1453824

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

722494

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33422

American (AMR)

AF:

0.00

AC:

AN:

43326

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25872

East Asian (EAS)

AF:

0.00

AC:

AN:

39436

South Asian (SAS)

AF:

0.00

AC:

AN:

84758

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52250

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

9.02e-7

AC:

AN:

1108912

Other (OTH)

AF:

0.00

AC:

AN:

60086

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Uncertain

-0.080

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.42

T;.;.;.

Eigen

Uncertain

0.42

Eigen_PC

Uncertain

0.46

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.97

D;D;D;D

M_CAP

Uncertain

0.19

MetaRNN

Uncertain

0.59

D;D;D;D

MetaSVM

Uncertain

0.12

MutationAssessor

Uncertain

2.2

M;.;.;M

PhyloP100

5.0

PrimateAI

Uncertain

0.55

PROVEAN

Uncertain

-3.2

D;D;D;D

REVEL

Uncertain

0.54

Sift

Benign

0.088

T;T;T;T

Sift4G

Uncertain

0.056

T;T;T;T

Polyphen

0.73

P;P;.;.

Vest4

0.59

MutPred

0.59

Loss of methylation at R579 (P = 0.0564);.;.;Loss of methylation at R579 (P = 0.0564);

MVP

0.94

MPC

0.67

ClinPred

0.93

GERP RS

5.0

Varity_R

0.17

gMVP

0.62

Mutation Taster

=41/59

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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

Computational scores

Splicing

Publications

Other links and lift over