rs398124648

Variant names:

• chr2-47161748-A-C
• rs398124648
• NM_001743.6:c.396T>G

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PM5 PP2 PP3 PP5_Moderate

The NM_001743.6(CALM2):​c.396T>G​(p.Asp132Glu) variant causes a missense change involving the alteration of a non-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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D132Y) has been classified 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: 1.74
• Publications: 2 publications found

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]

CALM2 Gene-Disease associations (from GenCC):

• long QT syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• long QT syndrome 15

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• catecholaminergic polymorphic ventricular tachycardia

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, ClinGen, G2P

ENSG00000273269 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 10 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, 4 uncertain in NM_001743.6
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-47161750-C-A is described in ClinVar as Pathogenic. ClinVar VariationId is 1456260.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant in the CALM2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 18 curated pathogenic missense variants (we use a threshold of 10). The gene has 5 curated benign missense variants. Gene score misZ: 2.7928 (below the threshold of 3.09). Trascript score misZ: 3.5506 (above the threshold of 3.09). GenCC associations: The gene is linked to catecholaminergic polymorphic ventricular tachycardia, long QT syndrome 15, long QT syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.787
• PP5: Variant 2-47161748-A-C is Pathogenic according to our data. Variant chr2-47161748-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 96722.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CALM2	NM_001743.6	c.396T>G	p.Asp132Glu	missense_variant	Exon 5 of 6	ENST00000272298.12	NP_001734.1
CALM2	NM_001305624.1	c.540T>G	p.Asp180Glu	missense_variant	Exon 6 of 7		NP_001292553.1
CALM2	NM_001305625.2	c.288T>G	p.Asp96Glu	missense_variant	Exon 5 of 6		NP_001292554.1
CALM2	NM_001305626.1	c.288T>G	p.Asp96Glu	missense_variant	Exon 4 of 5		NP_001292555.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CALM2	ENST00000272298.12	c.396T>G	p.Asp132Glu	missense_variant	Exon 5 of 6	1	NM_001743.6	ENSP00000272298.7
ENSG00000273269	ENST00000422269.1	n.101-8732T>G		intron_variant	Intron 2 of 8	2		ENSP00000476793.1

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 15 Pathogenic:2

Aug 20, 2018

Institute of Human Genetics Munich, TUM University Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 01, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Long QT syndrome 1 Pathogenic:1

-

George Lab Vanderbilt University

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
CardioboostArm	Uncertain	0.38
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Uncertain	23
DANN	Benign	0.89
DEOGEN2	Benign	0.32	.;.;T;.
Eigen	Benign	0.15
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.94	D;D;.;D
M_CAP	Pathogenic	0.50	D
MetaRNN	Pathogenic	0.79	D;D;D;D
MetaSVM	Uncertain	-0.21	T
PhyloP100		1.7
PrimateAI	Pathogenic	0.91	D
PROVEAN	Uncertain	-2.4	N;.;D;D
REVEL	Pathogenic	0.77
Sift	Pathogenic	0.0	.;.;D;D
Sift4G	Uncertain	0.033	D;D;D;D
Vest4		0.78
MutPred		0.77		Gain of disorder (P = 0.13);.;.;.;
MVP		0.91
MPC		2.2
ClinPred		0.63	D
GERP RS		3.4
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.8
Varity_R		0.58
gMVP		0.94
Mutation Taster		=8/92	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs398124648; hg19: chr2-47388887;