rs398124649

chr2-47161737-T-G

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PP2 PP3 PP5

The NM_001743.6(CALM2):c.407A>C(p.Gln136Pro) 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 Likely pathogenic (no stars).

• Frequency: Genomes: not found (cov: 31)
• Consequence: CALM2 NM_001743.6 missense
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• 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 7 ACMG points.

• PM1: In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 1 uncertain in NM_001743.6
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, CALM2
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.787
• PP5: Variant 2-47161737-T-G is Pathogenic according to our data. Variant chr2-47161737-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 96724.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CALM2	NM_001743.6	c.407A>C	p.Gln136Pro	missense_variant	5/6	ENST00000272298.12
CALM2	NM_001305624.1	c.551A>C	p.Gln184Pro	missense_variant	6/7
CALM2	NM_001305625.2	c.299A>C	p.Gln100Pro	missense_variant	5/6
CALM2	NM_001305626.1	c.299A>C	p.Gln100Pro	missense_variant	4/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CALM2	ENST00000272298.12	c.407A>C	p.Gln136Pro	missense_variant	5/6	1	NM_001743.6	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Long QT syndrome 1 Pathogenic:1

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
CardioboostArm	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
Cadd	Pathogenic	28
Dann	Uncertain	0.99
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D;D;.;D
M_CAP	Pathogenic	0.59	D
MetaRNN	Pathogenic	0.79	D;D;D;D
MetaSVM	Uncertain	-0.19	T
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.87	D
PROVEAN	Uncertain	-3.3	D;.;D;D
REVEL	Pathogenic	0.77
Sift4G	Uncertain	0.016	D;T;D;D
Vest4		0.88
MutPred		0.46		Gain of catalytic residue at G135 (P = 0.1328);.;.;.;
MVP		0.53
MPC		2.9
ClinPred		0.99	D
GERP RS		5.7
Varity_R		0.85
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: rs398124649; hg19: chr2-47388876;