Genetic Variant CASQ2:c.738-6_738-5dupTT (chr1-115725557-G-GAA) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The NM_001232.4(CASQ2):c.738-6_738-5dupTT variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.00041 ( 0 hom., cov: 0)

Exomes 𝑓: 0.0044 ( 16 hom. )

Consequence

CASQ2
NM_001232.4 splice_region, intron

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.516

Publications

3 publications found

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 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

CASQ2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BS2

High Homozygotes in GnomAdExome4 at 16 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CASQ2	NM_001232.4 link	c.738-6_738-5dupTT		splice_region_variant, intron_variant	Intron 6 of 10	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.738-5_738-4insTT		splice_region_variant, intron_variant	Intron 6 of 10	1	NM_001232.4	ENSP00000261448.5		O14958-1

Frequencies

GnomAD3 genomes

AF:

0.000412

AC:

AN:

113962

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000617

Gnomad AMI

AF:

0.00130

Gnomad AMR

AF:

0.000485

Gnomad ASJ

AF:

0.000334

Gnomad EAS

AF:

0.00105

Gnomad SAS

AF:

0.000912

Gnomad FIN

AF:

0.000283

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000229

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00435

AC:

5575

AN:

1280466

Hom.:

Cov.:

AF XY:

0.00458

AC XY:

2922

AN XY:

637704

show subpopulations

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

African (AFR)

AF:

0.0141

AC:

395

AN:

28040

American (AMR)

AF:

0.0216

AC:

673

AN:

31136

Ashkenazi Jewish (ASJ)

AF:

0.00838

AC:

189

AN:

22550

East Asian (EAS)

AF:

0.00797

AC:

288

AN:

36118

South Asian (SAS)

AF:

0.00933

AC:

670

AN:

71832

European-Finnish (FIN)

AF:

0.00556

AC:

205

AN:

36856

Middle Eastern (MID)

AF:

0.00355

AC:

AN:

3662

European-Non Finnish (NFE)

AF:

0.00296

AC:

2950

AN:

997080

Other (OTH)

AF:

0.00361

AC:

192

AN:

53192

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.317

Heterozygous variant carriers

441

882

1324

1765

2206

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

100

200

300

400

500

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000413

AC:

AN:

113934

Hom.:

Cov.:

AF XY:

0.000416

AC XY:

AN XY:

52858

show subpopulations

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

African (AFR)

AF:

0.000616

AC:

AN:

30822

American (AMR)

AF:

0.000485

AC:

AN:

10304

Ashkenazi Jewish (ASJ)

AF:

0.000334

AC:

AN:

2990

East Asian (EAS)

AF:

0.00105

AC:

AN:

3814

South Asian (SAS)

AF:

0.000920

AC:

AN:

3260

European-Finnish (FIN)

AF:

0.000283

AC:

AN:

3528

Middle Eastern (MID)

AF:

0.00

AC:

AN:

224

European-Non Finnish (NFE)

AF:

0.000229

AC:

AN:

56682

Other (OTH)

AF:

0.00

AC:

AN:

1542

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.378

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0204

Hom.:

284

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.52

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over