rs146664754

Variant names:

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_StrongBS1BS2

The NM_001232.4(CASQ2):c.567C>G(p.Phe189Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000752 in 1,613,870 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00077 ( 3 hom. )

Consequence

CASQ2
NM_001232.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:10B:8

Conservation

PhyloP100: 1.71

Variant links:

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]

CASQ2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -12 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.05320248).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000532 (81/152284) while in subpopulation AMR AF= 0.000719 (11/15302). AF 95% confidence interval is 0.000495. There are 0 homozygotes in gnomad4. There are 43 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CASQ2	NM_001232.4 link	c.567C>G	p.Phe189Leu	missense_variant	Exon 5 of 11	ENST00000261448.6	NP_001223.2	O14958-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CASQ2	ENST00000261448.6 link	c.567C>G	p.Phe189Leu	missense_variant	Exon 5 of 11	1	NM_001232.4	ENSP00000261448.5		O14958-1
CASQ2	ENST00000488931.2 link	n.291C>G		non_coding_transcript_exon_variant	Exon 6 of 13	3		ENSP00000518226.1

Frequencies

GnomAD3 genomes

AF:

0.000532

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000720

Gnomad ASJ

AF:

0.00691

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000647

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000716

AC:

180

AN:

251354

Hom.:

AF XY:

0.000721

AC XY:

AN XY:

135842

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000867

Gnomad ASJ exome

AF:

0.00863

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000413

Gnomad OTH exome

AF:

0.00180

GnomAD4 exome

AF:

0.000775

AC:

1132

AN:

1461586

Hom.:

Cov.:

AF XY:

0.000763

AC XY:

555

AN XY:

727120

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.000872

Gnomad4 ASJ exome

AF:

0.00842

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000139

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000699

Gnomad4 OTH exome

AF:

0.00118

GnomAD4 genome

AF:

0.000532

AC:

AN:

152284

Hom.:

Cov.:

AF XY:

0.000578

AC XY:

AN XY:

74452

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.000719

Gnomad4 ASJ

AF:

0.00691

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000647

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.00113

Hom.:

Bravo

AF:

0.000612

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00130

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00105

AC:

ExAC

AF:

0.000692

AC:

EpiCase

AF:

0.000600

EpiControl

AF:

0.000474

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:10Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:3Benign:2

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Dec 05, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22198169, 24025405, 21618644, 22421959, 21454795, 23022705, 27538377, 21063088, 28818208, 28404607, 34426522, 25651173, 26671417, 18543230, 37937776) -

Mar 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

CASQ2: PM2:Supporting -

Sep 03, 2014

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Catecholaminergic polymorphic ventricular tachycardia 2

Uncertain:4

Aug 13, 2015

Knight Diagnostic Laboratories, Oregon Health and Sciences University

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

May 15, 2023

New York Genome Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 09, 2021

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Uncertain:1Benign:1

Dec 06, 2013

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The Phe189Leu variant in CASQ2 has been reported in the heterozygous state in 1 individual with CPVT (Liu 2008). This variant is present at low frequency in var ious large populations, for example in 0.1% (9/8600) of European American chromo somes screened by the NHLBI Exome Sequencing Project (http://evs.gs.washington.e du/EVS/; dbSNP rs146664754). Studies have shown that the Phe189Leu variant may i mpactthe protein (Eckey 2010). However, this in vitro assay may not accurately r epresent biological function. Computational analyses (biochemical amino acid pro perties, conservation, AlignGVGD, PolyPhen2, and SIFT) suggest that the Phe189Le u variant may impact the protein, though this information is not predictive enou gh to determine pathogenicity. In summary, the available information for this va riant is somewhat conflicting. Additional information is needed to fully assess its clinical significance. -

Feb 24, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: CASQ2 c.567C>G (p.Phe189Leu) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00075 in 1613870 control chromosomes, predominantly at a frequency of 0.0082 within the Ashkenazi Jewish subpopulation in the gnomAD database, including 2 homozygotes. The observed variant frequency within Ashkenazi Jewish control individuals in the gnomAD database is approximately 5 fold of the estimated maximal expected allele frequency for a pathogenic variant in CASQ2 causing Catecholaminergic Polymorphic Ventricular Tachycardia phenotype (0.0016). To our knowledge, no experimental evidence demonstrating this variants impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 162814). Based on the evidence outlined above, the variant was classified as likely benign. -

Cardiomyopathy

Uncertain:1Benign:1

Nov 04, 2019

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 24, 2019

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Polymorphic ventricular tachycardia

Uncertain:1

Apr 05, 2018

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Sudden unexplained death

Benign:1

Feb 09, 2018

Agnes Ginges Centre for Molecular Cardiology, Centenary Institute

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: research

The CASQ2 Phe189Leu variant has been previously reported in 2 CPVT families (Liu QQ, et al, 2008) and one sudden death case (Rajagopalan A & Pollanen MS, 2016). An in vitro functional study performed on Xenopus oocytes, has shown that the variant causes a reduction in hERG function and reduces flexbility of the CASQ2 protein, which suggests it may play a role in the aetiology of CPVT (Eckey K, et al., 2010). However, the use of an in vitro assay on amphibian oocytes may not reflect the actual biological function of the mutated protein in the mammalian heart. The CASQ2 Phe189Leu variant is present in the Exome Aggregation Consortium dataset (MAF= 0.0007, http://exac.broadinstitute.org/) and is particularly common in the European population; allele frequency=0.091, which is higher then expected for an inherited heart condition. We identified this variant in a case of sudden unexplained death in a young male. Genetic testing in this individual also identified two other variants (NEBL Gln682* & PKP2 Glu85Metfs*260), both of which are very rare. Furthermore, one study identified a substantial overrepresentation of CPVT-associated variants in an exome population database (ESP), the authors predict that these variants are not the monogenic cause of CPVT (Jabbari J, et al, 2013). In summary, based on the high allele frequency in the general population and lack of established functional data in mammalian models or other strong data supportive of a pathogenic role, we classify CASQ2 Phe189Leu as "likely benign". -

Catecholaminergic polymorphic ventricular tachycardia 1

Benign:1

Jan 22, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Benign:1

May 29, 2018

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

CASQ2-related disorder

Benign:1

Sep 15, 2022

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.96

BayesDel_addAF

Uncertain

0.040

BayesDel_noAF

Pathogenic

0.24

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.63

Eigen

Uncertain

0.39

Eigen_PC

Uncertain

0.34

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.94

M_CAP

Uncertain

0.098

MetaRNN

Benign

0.053

MetaSVM

Uncertain

0.052

MutationAssessor

Uncertain

2.8

PrimateAI

Uncertain

0.70

PROVEAN

Pathogenic

-4.8

REVEL

Pathogenic

0.70

Sift

Uncertain

0.022

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.77

MutPred

0.97

Loss of sheet (P = 0.0817);

MVP

0.92

MPC

0.34

ClinPred

0.11

GERP RS

3.8

Varity_R

0.87

gMVP

0.75

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over