NM_001232.4:c.752G>T

Variant names:

• chr1-115725539-C-A
• rs200265771
• NM_001232.4:c.752G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001232.4(CASQ2):​c.752G>T​(p.Arg251Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000141 in 1,420,296 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R251C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0000080 (0 hom., cov: 29)
  • Exomes 𝑓: 7.7e-7 (0 hom.)
• Consequence: CASQ2 NM_001232.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.17
• Publications: 3 publications found

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 Gene-Disease associations (from GenCC):

• catecholaminergic polymorphic ventricular tachycardia

  Inheritance: AD, AR Classification: DEFINITIVE, MODERATE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• catecholaminergic polymorphic ventricular tachycardia 2

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P, Genomics England PanelApp
• hypertrophic cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CASQ2	NM_001232.4	c.752G>T	p.Arg251Leu	missense_variant	Exon 7 of 11	ENST00000261448.6	NP_001223.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CASQ2	ENST00000261448.6	c.752G>T	p.Arg251Leu	missense_variant	Exon 7 of 11	1	NM_001232.4	ENSP00000261448.5

Frequencies

GnomAD3 genomes AF: 0.00000804 AC: 1 AN: 124390 Hom.: 0 Cov.: 29

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000158

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00000404 AC: 1 AN: 247550 AF XY: 0.00000747

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000897

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 7.72e-7 AC: 1 AN: 1295906 Hom.: 0 Cov.: 45 AF XY: 0.00000153 AC XY: 1 AN XY: 651682

African (AFR) AF: 0.00 AC: 0 AN: 30280

American (AMR) AF: 0.00 AC: 0 AN: 44008

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24780

East Asian (EAS) AF: 0.00 AC: 0 AN: 38270

South Asian (SAS) AF: 0.00 AC: 0 AN: 82864

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51858

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4370

European-Non Finnish (NFE) AF: 0.00000104 AC: 1 AN: 965034

Other (OTH) AF: 0.00 AC: 0 AN: 54442

GnomAD4 genome AF: 0.00000804 AC: 1 AN: 124390 Hom.: 0 Cov.: 29 AF XY: 0.0000173 AC XY: 1 AN XY: 57952

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 31408

American (AMR) AF: 0.00 AC: 0 AN: 9872

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3328

East Asian (EAS) AF: 0.00 AC: 0 AN: 4308

South Asian (SAS) AF: 0.00 AC: 0 AN: 3972

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 5660

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 216

European-Non Finnish (NFE) AF: 0.0000158 AC: 1 AN: 63164

Other (OTH) AF: 0.00 AC: 0 AN: 1592

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Uncertain	0.062	T
BayesDel_noAF	Benign	-0.15
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.59	D
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.017	T
MetaRNN	Uncertain	0.58	D
MetaSVM	Benign	-0.62	T
MutationAssessor	Benign	1.5	L
PhyloP100		5.2
PrimateAI	Uncertain	0.55	T
PROVEAN	Uncertain	-3.0	D
REVEL	Uncertain	0.41
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.041	D
Polyphen		0.083	B
Vest4		0.60
MutPred		0.63		Loss of disorder (P = 0.04);
MVP		0.88
MPC		0.057
ClinPred		0.96	D
GERP RS		5.3
Varity_R		0.78
gMVP		0.64
Mutation Taster		=32/68	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs200265771; hg19: chr1-116268160;