rs398124647

Positions:

• chr2-47161851-T-A
• chr2-47161851-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP2 PP3_Moderate PP5_Moderate

The NM_001743.6(CALM2):​c.293A>T​(p.Asn98Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: CALM2 NM_001743.6 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 7.98

Genes affected

CALM2 (HGNC:1445): (calmodulin 2) This gene is a member of the calmodulin gene family. There are three distinct calmodulin genes dispersed throughout the genome that encode the identical protein, but differ at the nucleotide level. Calmodulin is a calcium binding protein that plays a role in signaling pathways, cell cycle progression and proliferation. Several infants with severe forms of long-QT syndrome (LQTS) who displayed life-threatening ventricular arrhythmias together with delayed neurodevelopment and epilepsy were found to have mutations in either this gene or another member of the calmodulin gene family (PMID:23388215). Mutations in this gene have also been identified in patients with less severe forms of LQTS (PMID:24917665), while mutations in another calmodulin gene family member have been associated with catecholaminergic polymorphic ventricular tachycardia (CPVT)(PMID:23040497), a rare disorder thought to be the cause of a significant fraction of sudden cardiac deaths in young individuals. Pseudogenes of this gene are found on chromosomes 10, 13, and 17. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2015]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a binding_site (size 0) in uniprot entity CALM3_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CALM2. . Gene score misZ 2.7928 (greater than the threshold 3.09). Trascript score misZ 3.5506 (greater than threshold 3.09). GenCC has associacion of gene with long QT syndrome, long QT syndrome 15, catecholaminergic polymorphic ventricular tachycardia.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.919
• PP5: Variant 2-47161851-T-A is Pathogenic according to our data. Variant chr2-47161851-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 96721.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CALM2	NM_001743.6	c.293A>T	p.Asn98Ile	missense_variant	5/6	ENST00000272298.12	NP_001734.1
CALM2	NM_001305624.1	c.437A>T	p.Asn146Ile	missense_variant	6/7		NP_001292553.1
CALM2	NM_001305625.2	c.185A>T	p.Asn62Ile	missense_variant	5/6		NP_001292554.1
CALM2	NM_001305626.1	c.185A>T	p.Asn62Ile	missense_variant	4/5		NP_001292555.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CALM2	ENST00000272298.12	c.293A>T	p.Asn98Ile	missense_variant	5/6	1	NM_001743.6	ENSP00000272298	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

Long QT syndrome 1 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 06, 2022	For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Asn98 amino acid residue in CALM2. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 24917665, 27100291, 27114410, 27165696, 28335032, 31283864). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. Experimental studies have shown that this missense change affects CALM2 function (PMID: 24917665, 30348784). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 96721). This variant is also known as D97I. This missense change has been observed in individual(s) with long QT syndrome (PMID: 24917665). 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 isoleucine, which is neutral and non-polar, at codon 98 of the CALM2 protein (p.Asn98Ile). -
Likely pathogenic, no assertion criteria provided	literature only	George Lab Vanderbilt University	-	- -

Long QT syndrome 15 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Aug 01, 2014

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.16
CADD	Pathogenic	28
DANN	Uncertain	0.98
DEOGEN2	Benign	0.36	.;T;.
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.88	D;.;D
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	0.92	D;D;D
MetaSVM	Uncertain	0.14	D
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.92	D
PROVEAN	Pathogenic	-8.0	D;D;D
REVEL	Pathogenic	0.91
Sift	Pathogenic	0.0	.;D;D
Sift4G	Uncertain	0.0020	D;D;D
Vest4		0.90
MutPred		0.71		Gain of catalytic residue at N98 (P = 0.0055);.;.;
MVP		0.81
MPC		2.6
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.88
gMVP		0.99

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: rs398124647; hg19: chr2-47388990;