rs267607277

Variant names:

• chr14-90404386-A-G
• rs267607277
• NM_006888.6:c.293A>G

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM1 PM2 PP2 PP5_Very_Strong

The NM_006888.6(CALM1):​c.293A>G​(p.Asn98Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CALM1 NM_006888.6 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:9 O:1
• Conservation: PhyloP100: 9.27

Genes affected

CALM1 (HGNC:1442): (calmodulin 1) This gene encodes one of three calmodulin proteins which are members of the EF-hand calcium-binding protein family. Calcium-induced activation of calmodulin regulates and modulates the function of cardiac ion channels. Two pseudogenes have been identified on chromosome 7 and X. Multiple transcript variants encoding different isoforms have been found for this gene.A missense mutation in the CALM1 gene has been associated with ventricular tachycardia.[provided by RefSeq, May 2020]

ENSG00000258424 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PM1: In a binding_site (size 0) in uniprot entity CALM2_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the CALM1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 16 curated pathogenic missense variants (we use a threshold of 10). The gene has 5 curated benign missense variants. Gene score misZ: 3.051 (below the threshold of 3.09). Trascript score misZ: 3.5833 (above the threshold of 3.09). GenCC associations: The gene is linked to long QT syndrome, catecholaminergic polymorphic ventricular tachycardia 4, long QT syndrome 14, catecholaminergic polymorphic ventricular tachycardia.
• PP5: Variant 14-90404386-A-G is Pathogenic according to our data. Variant chr14-90404386-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 39758.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-90404386-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CALM1	NM_006888.6	c.293A>G	p.Asn98Ser	missense_variant	Exon 5 of 6	ENST00000356978.9	NP_008819.1
CALM1	NM_001363670.2	c.296A>G	p.Asn99Ser	missense_variant	Exon 5 of 6		NP_001350599.1
CALM1	NM_001363669.2	c.185A>G	p.Asn62Ser	missense_variant	Exon 5 of 6		NP_001350598.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CALM1	ENST00000356978.9	c.293A>G	p.Asn98Ser	missense_variant	Exon 5 of 6	1	NM_006888.6	ENSP00000349467.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:9 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Catecholaminergic polymorphic ventricular tachycardia 4 Pathogenic:4 Other:1

-

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Oct 05, 2012

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Sep 21, 2024

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0104 - Dominant negative is a known mechanism of disease in this gene and is associated with catecholaminergic polymorphic ventricular tachycardia 4 (CPVT; MIM#614916) and Long QT syndrome 14 (LQTS; MIM#616247). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0200 - Variant is predicted to result in a missense amino acid change from asparagine to serine. (I) 0251 - This variant is heterozygous. (I) 0301 - Variant is absent from gnomAD (both v2 and v3). (SP) 0502 - Missense variant with conflicting in silico predictions and uninformative conservation. (I) 0603 - Missense variant in a region that is highly intolerant to missense variation (high constraint region in DECIPHER). The variant is located in the EF-hand III domain (PMID: 37380439). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been reported as likely pathogenic/pathogenic by five clinical laboratories in ClinVar and in three de novo individuals with CPVT or a combination of CPVT/LQTS (PMID: 23040497, PMID: 37380439). (SP) 1203 - This variant has been shown to be de novo in the proband (parental status confirmed) (by trio analysis). (SP) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

Jul 23, 2012

Nyegaard lab; Aarhus University

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Jul 13, 2016

Center for Medical Genetics Ghent, University of Ghent

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

CALM1-related disorder Pathogenic:1

Apr 28, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The CALM1 c.293A>G variant is predicted to result in the amino acid substitution p.Asn98Ser. This variant was reported as de novo in individuals with ventricular tachycardia and sudden cardiac death/cardiac arrhythmias (see example: described as p.Asn97Ser, Nyegaard et al 2012. PubMed ID: 23040497; Halvorsen et al. 2021. PubMed ID: 34930847). Functional studies demonstrated this variant significantly prolonged calmodulin action potentials (Limpitikul et al. 2014. PubMed ID: 24816216) and a transgenic mouse model recapitulated the human cardiac phenotype (Tsai et al. 2020. PubMed ID: 32929985). This variant has not been reported in a large population database, indicating this variant is rare. This variant is interpreted as pathogenic. -

Catecholaminergic polymorphic ventricular tachycardia Pathogenic:1

Aug 10, 2017

Royal Brompton Clinical Genetics And Genomics Laboratory, NHS South East Genomic Laboratory Hub

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

To the best of our knowledge the CALM1 c.293A>G variant has not been reported in any other patients, nor detected in approximately 120,000 individuals in control populations. Functional studies have demonstrated the variant has an impact on protein structure/function (Hwang et al. Circ Res. 2014 Mar 28;114(7):1114-24; Søndergaard et al. FEBS J. 2015 Feb;282(4):803-16; Søndergaard et al. J Biol Chem. 2015 Oct 23;290(43):26151-62; Vassilakopoulou et al. Biochim Biophys Acta. 2015 Nov;1850(11):2168-76). Evidence for pathogenicity: - Population Controls alleles / total (frequency): Exome Agregation Consortium (ExAC) - 0/121412 (0.0), RBH healthy cohort - 0/2144 (0.0) - Missense Effect Predictions - 42.86% (3/7) of algorithms have predicted that this variant will adversely affect protein function -

Catecholaminergic polymorphic ventricular tachycardia 4;C4015671:Long QT syndrome 14 Pathogenic:1

Sep 03, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects CALM1 function (PMID: 23040497, 24563457, 24816216, 25557436, 26309258). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 39758). This variant is also known as p.Asn97Ser. This missense change has been observed in individual(s) with catecholaminergic polymorphic VT (PMID: 23040497). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 98 of the CALM1 protein (p.Asn98Ser). -

Catecholaminergic polymorphic ventricular tachycardia 1 Pathogenic:1

Nov 26, 2014

Blueprint Genetics

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Cardiovascular phenotype Pathogenic:1

Oct 20, 2017

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.N98S variant (also known as c.293A>G), located in coding exon 5 of the CALM1 gene, results from an A to G substitution at nucleotide position 293. The asparagine at codon 98 is replaced by serine, an amino acid with highly similar properties. This alteration has been reported to occur de novo in an individual with catecholaminergic polymorphic ventricular tachycardia (Nyegaard M et al. Am. J. Hum. Genet., 2012 Oct;91:703-12). Internal structure analysis revealed that this alteration is indicated to disrupt a calcium binding residue. Consistent with that, functional studies in various experimental systems have shown that this alteration would attenuate calcium binding (Nyegaard M et al. Am. J. Hum. Genet., 2012 Oct;91:703-12; Hwang HS et al. Circ. Res., 2014 Mar;114:1114-24; Limpitikul WB et al. J. Mol. Cell. Cardiol., 2014 Sep;74:115-24; Søndergaard MT et al. FEBS J., 2015 Feb;282:803-16; Søndergaard MT et al. J. Biol. Chem., 2015 Oct;290:26151-62; Yu CC et al. Heart Rhythm, 2016 Aug;13:1716-23; Vassilakopoulou V et al. Biochim. Biophys. Acta, 2015 Nov;1850:2168-76). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.052	T
BayesDel_noAF	Benign	-0.31
CADD	Pathogenic	27
DANN	Benign	0.92
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.97	D;.;D;.;.
M_CAP	Pathogenic	0.53	D
MetaRNN	Uncertain	0.68	D;D;D;D;D
MetaSVM	Benign	-0.53	T
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-4.4	D;D;D;D;D
REVEL	Uncertain	0.44
Sift4G	Benign	0.20	T;T;T;T;T
Polyphen		0.032	.;.;B;.;.
Vest4		0.79, 0.90, 0.80, 0.89
MutPred		0.64		.;.;Gain of glycosylation at N99 (P = 0.0445);.;.;
MVP		0.83
MPC		1.6
ClinPred		0.98	D
GERP RS		5.5
Varity_R		0.79
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs267607277; hg19: chr14-90870730;