rs1555365887

Positions:

• chr14-90401381-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_006888.6(CALM1):​c.157A>G​(p.Ile53Val) 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CALM1 NM_006888.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.32

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CALM1. . Gene score misZ 3.051 (greater than the threshold 3.09). Trascript score misZ 3.5833 (greater than threshold 3.09). GenCC has associacion of gene with long QT syndrome, catecholaminergic polymorphic ventricular tachycardia 4, long QT syndrome 14, catecholaminergic polymorphic ventricular tachycardia.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CALM1	NM_006888.6	c.157A>G	p.Ile53Val	missense_variant	3/6	ENST00000356978.9	NP_008819.1
CALM1	NM_001363670.2	c.160A>G	p.Ile54Val	missense_variant	3/6		NP_001350599.1
CALM1	NM_001363669.2	c.49A>G	p.Ile17Val	missense_variant	3/6		NP_001350598.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CALM1	ENST00000356978.9	c.157A>G	p.Ile53Val	missense_variant	3/6	1	NM_006888.6	ENSP00000349467	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 03, 2017

In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C25"). This variant has not been reported in the literature in individuals with a CALM1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with valine at codon 53 of the CALM1 protein (p.Ile53Val). The isoleucine residue is highly conserved and there is a small physicochemical difference between isoleucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.012	T
BayesDel_noAF	Benign	-0.22
CADD	Uncertain	25
DANN	Benign	0.93
Eigen	Benign	0.018
Eigen_PC	Benign	0.15
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.95	D;.;D;.;.;.
M_CAP	Pathogenic	0.40	D
MetaRNN	Uncertain	0.57	D;D;D;D;D;D
MetaSVM	Benign	-0.56	T
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.87	D
PROVEAN	Benign	-0.81	N;N;N;.;N;N
REVEL	Uncertain	0.33
Sift4G	Benign	0.31	T;T;T;T;T;T
Polyphen		0.0050	.;.;B;.;.;.
Vest4		0.36, 0.40, 0.38, 0.38, 0.40
MutPred		0.61		.;.;Gain of disorder (P = 0.1589);.;.;.;
MVP		0.89
MPC		1.6
ClinPred		0.98	D
GERP RS		3.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.39
gMVP		0.80

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: rs1555365887; hg19: chr14-90867725;