chr7-143321381-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_000083.3(CLCN1):c.450C>T(p.Tyr150Tyr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00175 in 1,614,206 control chromosomes in the GnomAD database, including 37 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0088 ( 10 hom., cov: 33)

Exomes 𝑓: 0.0010 ( 27 hom. )

Consequence

CLCN1
NM_000083.3 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: -0.167

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.68).

BP6

Variant 7-143321381-C-T is Benign according to our data. Variant chr7-143321381-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 359099.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr7-143321381-C-T is described in Lovd as [Benign].

BP7

Synonymous conserved (PhyloP=-0.167 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00875 (1333/152330) while in subpopulation AFR AF= 0.0302 (1257/41560). AF 95% confidence interval is 0.0289. There are 10 homozygotes in gnomad4. There are 636 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 10 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLCN1	NM_000083.3 link	c.450C>T	p.Tyr150Tyr	synonymous_variant	Exon 4 of 23	ENST00000343257.7	NP_000074.3	P35523
CLCN1	NR_046453.2 link	n.552C>T		non_coding_transcript_exon_variant	Exon 4 of 22

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLCN1	ENST00000343257.7 link	c.450C>T	p.Tyr150Tyr	synonymous_variant	Exon 4 of 23	1	NM_000083.3	ENSP00000339867.2		P35523

Frequencies

GnomAD3 genomes

AF:

0.00870

AC:

1324

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0301

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00360

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000188

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00574

GnomAD3 exomes

AF:

0.00258

AC:

648

AN:

251386

Hom.:

AF XY:

0.00194

AC XY:

263

AN XY:

135880

show subpopulations

Gnomad AFR exome

AF:

0.0317

Gnomad AMR exome

AF:

0.00165

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.000457

Gnomad FIN exome

AF:

0.000508

Gnomad NFE exome

AF:

0.000387

Gnomad OTH exome

AF:

0.000815

GnomAD4 exome

AF:

0.00102

AC:

1496

AN:

1461876

Hom.:

Cov.:

AF XY:

0.000891

AC XY:

648

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.0332

Gnomad4 AMR exome

AF:

0.00195

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000336

Gnomad4 FIN exome

AF:

0.000524

Gnomad4 NFE exome

AF:

0.0000908

Gnomad4 OTH exome

AF:

0.00220

GnomAD4 genome

AF:

0.00875

AC:

1333

AN:

152330

Hom.:

Cov.:

AF XY:

0.00854

AC XY:

636

AN XY:

74482

show subpopulations

Gnomad4 AFR

AF:

0.0302

Gnomad4 AMR

AF:

0.00359

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.000188

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00568

Alfa

AF:

0.00402

Hom.:

Bravo

AF:

0.0102

Asia WGS

AF:

0.00346

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Mar 23, 2017

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Mar 01, 2024

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Benign:2

Feb 01, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 01, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Batten-Turner congenital myopathy

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided

Benign:1

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

CLCN1-related disorder

Benign:1

Jul 19, 2019

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.68

CADD

Benign

0.55

DANN

Benign

0.41

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

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