rs201861334

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 1P and 0B. PP3

The NM_000083.3(CLCN1):c.2545G>A(p.Ala849Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000568 in 1,614,100 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00028 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00060 ( 1 hom. )

Consequence

CLCN1
NM_000083.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:1

Conservation

PhyloP100: 9.31

Variant links:

Genes affected

CLCN1 (HGNC:2019): (chloride voltage-gated channel 1) The CLCN family of voltage-dependent chloride channel genes comprises nine members (CLCN1-7, Ka and Kb) which demonstrate quite diverse functional characteristics while sharing significant sequence homology. The protein encoded by this gene regulates the electric excitability of the skeletal muscle membrane. Mutations in this gene cause two forms of inherited human muscle disorders: recessive generalized myotonia congenita (Becker) and dominant myotonia (Thomsen). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2012]

CLCN1 links:

CLCN1 (HGNC:):

CLCN1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.753

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLCN1	NM_000083.3 linkuse as main transcript	c.2545G>A	p.Ala849Thr	missense_variant	22/23	ENST00000343257.7	NP_000074.3	P35523
CLCN1	NR_046453.2 linkuse as main transcript	n.2500G>A		non_coding_transcript_exon_variant	21/22

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
CLCN1	ENST00000343257.7 linkuse as main transcript	c.2545G>A	p.Ala849Thr	missense_variant	22/23	1	NM_000083.3	ENSP00000339867.2	P35523
CLCN1	ENST00000432192.6 linkuse as main transcript	n.*1830G>A		non_coding_transcript_exon_variant	22/23	1		ENSP00000395949.2	H7C0N6
CLCN1	ENST00000432192.6 linkuse as main transcript	n.*1830G>A		3_prime_UTR_variant	22/23	1		ENSP00000395949.2	H7C0N6
CLCN1	ENST00000650516.2 linkuse as main transcript	c.2545G>A	p.Ala849Thr	missense_variant	22/23			ENSP00000498052.2	A0A3B3IU72

Frequencies

GnomAD3 genomes

AF:

0.000283

AC:

AN:

152102

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000966

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000529

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000290

AC:

AN:

251482

Hom.:

AF XY:

0.000287

AC XY:

AN XY:

135914

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.0000924

Gnomad NFE exome

AF:

0.000527

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000598

AC:

874

AN:

1461880

Hom.:

Cov.:

AF XY:

0.000564

AC XY:

410

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000580

Gnomad4 FIN exome

AF:

0.000150

Gnomad4 NFE exome

AF:

0.000757

Gnomad4 OTH exome

AF:

0.000281

GnomAD4 genome

AF:

0.000282

AC:

AN:

152220

Hom.:

Cov.:

AF XY:

0.000282

AC XY:

AN XY:

74430

show subpopulations

Gnomad4 AFR

AF:

0.0000963

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000208

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000529

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000454

Hom.:

Bravo

AF:

0.000295

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000362

AC:

EpiCase

AF:

0.000273

EpiControl

AF:

0.000711

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Feb 27, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2024	Previously reported as a variant of uncertain significance in the heterozygous state in a patient with Schinzel-Giedion syndrome who also harbored a de novo SETBP1 pathogenic variant (PMID: 25852444); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 31216405, 25852444) -
Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	Aug 18, 2022	- -

Congenital myotonia, autosomal recessive form;C2936781:Congenital myotonia, autosomal dominant form

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Oct 17, 2012	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 17, 2022	This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 849 of the CLCN1 protein (p.Ala849Thr). This variant is present in population databases (rs201861334, gnomAD 0.05%), including at least one homozygous and/or hemizygous individual. This missense change has been observed in individual(s) with clinical features of CLCN1-related conditions (PMID: 31216405). ClinVar contains an entry for this variant (Variation ID: 359124). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CLCN1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Batten-Turner congenital myopathy

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Benign

0.0061

BayesDel_noAF

Uncertain

0.12

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.54

Eigen

Pathogenic

0.78

Eigen_PC

Pathogenic

0.69

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

M_CAP

Uncertain

0.16

MetaRNN

Pathogenic

0.75

MetaSVM

Pathogenic

0.87

MutationAssessor

Benign

1.9

PrimateAI

Pathogenic

0.83

PROVEAN

Uncertain

-3.7

REVEL

Pathogenic

0.73

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.0020

Polyphen

1.0

Vest4

0.91

MVP

0.95

MPC

0.71

ClinPred

0.19

GERP RS

4.2

Varity_R

0.72

gMVP

0.77

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