Genetic Variant CASQ2:c.738-11_738-5dupTTTTTTT (chr1-115725557-G-GAAAAAAA) – 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.738-11_738-5dupTTTTTTT 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 0.000026 ( 0 hom., cov: 0)

Exomes 𝑓: 0.00012 ( 3 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:

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ACMG classification

Classification was made for transcript

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

BS2

High Homozygotes in GnomAdExome4 at 3 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CASQ2	NM_001232.4 link	c.738-11_738-5dupTTTTTTT		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_738-4insTTTTTTT		splice_region_variant, intron_variant	Intron 6 of 10	1	NM_001232.4	ENSP00000261448.5		O14958-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

114022

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000325

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:

0.0000353

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.000123

AC:

158

AN:

1288622

Hom.:

Cov.:

AF XY:

0.000128

AC XY:

AN XY:

641920

show subpopulations

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

African (AFR)

AF:

0.000282

AC:

AN:

28372

American (AMR)

AF:

0.000943

AC:

AN:

31818

Ashkenazi Jewish (ASJ)

AF:

0.000176

AC:

AN:

22766

East Asian (EAS)

AF:

0.000302

AC:

AN:

36472

South Asian (SAS)

AF:

0.000275

AC:

AN:

72734

European-Finnish (FIN)

AF:

0.0000269

AC:

AN:

37150

Middle Eastern (MID)

AF:

0.000272

AC:

AN:

3680

European-Non Finnish (NFE)

AF:

0.0000728

AC:

AN:

1002130

Other (OTH)

AF:

0.000187

AC:

AN:

53500

⚠️ 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: 0.321

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.0000263

AC:

AN:

114022

Hom.:

Cov.:

AF XY:

0.0000189

AC XY:

AN XY:

52878

show subpopulations

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

African (AFR)

AF:

0.0000325

AC:

AN:

30800

American (AMR)

AF:

0.00

AC:

AN:

10300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2992

East Asian (EAS)

AF:

0.00

AC:

AN:

3824

South Asian (SAS)

AF:

0.00

AC:

AN:

3288

European-Finnish (FIN)

AF:

0.00

AC:

AN:

3528

Middle Eastern (MID)

AF:

0.00

AC:

AN:

246

European-Non Finnish (NFE)

AF:

0.0000353

AC:

AN:

56732

Other (OTH)

AF:

0.00

AC:

AN:

1544

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000103), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

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

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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1-115725557-GAAAAAAAAAAAAAAA-GAAAAAAAAAAAAAAAAAAAAAA

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