rs727502911

Positions:

• chr1-115768523-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Moderate BP6_Moderate

The NM_001232.4(CASQ2):​c.19T>C​(p.Phe7Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,698 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CASQ2 NM_001232.4 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 1.59

Genes affected

CASQ2 (HGNC:1513): (calsequestrin 2) The protein encoded by this gene specifies the cardiac muscle family member of the calsequestrin family. Calsequestrin is localized to the sarcoplasmic reticulum in cardiac and slow skeletal muscle cells. The protein is a calcium binding protein that stores calcium for muscle function. Mutations in this gene cause stress-induced polymorphic ventricular tachycardia, also referred to as catecholaminergic polymorphic ventricular tachycardia 2 (CPVT2), a disease characterized by bidirectional ventricular tachycardia that may lead to cardiac arrest. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.086378604).
• BP6: Variant 1-115768523-A-G is Benign according to our data. Variant chr1-115768523-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 162823.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CASQ2	NM_001232.4	c.19T>C	p.Phe7Leu	missense_variant	1/11	ENST00000261448.6	NP_001223.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CASQ2	ENST00000261448.6	c.19T>C	p.Phe7Leu	missense_variant	1/11	1	NM_001232.4	ENSP00000261448	P1
CASQ2	ENST00000488931.2	c.-223-35T>C		intron_variant, NMD_transcript_variant		3		ENSP00000518226

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459698 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726284

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.01e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Sep 26, 2014

Phe7Lue in exon 1 of CASQ2: This variant is not expected to have clinical signif icance due to a lack of conservation across species, including mammals. Of note, 17 mammals have a leucine (Leu) at this position despite moderate nearby amino acid conservation. In addition, computational prediction tools do not suggest a high likelihood of impact to the protein. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	15
DANN	Benign	0.85
DEOGEN2	Benign	0.068	T
Eigen	Benign	-0.83
Eigen_PC	Benign	-0.66
FATHMM_MKL	Benign	0.44	N
LIST_S2	Benign	0.57	T
M_CAP	Benign	0.0079	T
MetaRNN	Benign	0.086	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.68	N
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	0.41	N
REVEL	Benign	0.13
Sift	Benign	0.66	T
Sift4G	Benign	1.0	T
Polyphen		0.0	B
Vest4		0.074
MutPred		0.57		Loss of MoRF binding (P = 0.1121);
MVP		0.48
MPC		0.052
ClinPred		0.062	T
GERP RS		2.2
Varity_R		0.035
gMVP		0.24

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs727502911; hg19: chr1-116311144;