15-42402897-TC-T

Position:

• chr15-42402897-TC-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000070.3(CAPN3):​c.1642del​(p.Arg548AlafsTer47) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CAPN3 NM_000070.3 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.95

Genes affected

CAPN3 (HGNC:1480): (calpain 3) Calpain, a heterodimer consisting of a large and a small subunit, is a major intracellular protease, although its function has not been well established. This gene encodes a muscle-specific member of the calpain large subunit family that specifically binds to titin. Mutations in this gene are associated with limb-girdle muscular dystrophies type 2A. Alternate promoters and alternative splicing result in multiple transcript variants encoding different isoforms and some variants are ubiquitously expressed. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-42402897-TC-T is Pathogenic according to our data. Variant chr15-42402897-TC-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 558200.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr15-42402897-TC-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CAPN3	NM_000070.3	c.1642del	p.Arg548AlafsTer47	frameshift_variant	13/24	ENST00000397163.8	NP_000061.1
CAPN3	NM_024344.2	c.1642del	p.Arg548AlafsTer108	frameshift_variant	13/23		NP_077320.1
CAPN3	NM_173087.2	c.1498del	p.Arg500AlafsTer70	frameshift_variant	12/21		NP_775110.1
CAPN3	NM_173088.2	c.106del	p.Arg36AlafsTer47	frameshift_variant	2/13		NP_775111.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CAPN3	ENST00000397163.8	c.1642del	p.Arg548AlafsTer47	frameshift_variant	13/24	1	NM_000070.3	ENSP00000380349	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type 2A Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Counsyl

May 04, 2018

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1555422293; hg19: chr15-42695095;