rs144383442

chr15-42387779-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Strong BP6 BP7

The NM_000070.3(CAPN3):c.525C>T(p.Asp175=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000955 in 1,614,144 control chromosomes in the GnomAD database, including 2 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 0.00062 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00099 (2 hom.)
• Consequence: CAPN3 NM_000070.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:4
• Conservation: PhyloP100: -1.93

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 Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.51).
• BP6: Variant 15-42387779-C-T is Benign according to our data. Variant chr15-42387779-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 197103.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=1, Uncertain_significance=3}. Variant chr15-42387779-C-T is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-1.93 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CAPN3	NM_000070.3	c.525C>T	p.Asp175=	synonymous_variant	4/24	ENST00000397163.8
CAPN3	NM_024344.2	c.525C>T	p.Asp175=	synonymous_variant	4/23
CAPN3	NM_173087.2	c.525C>T	p.Asp175=	synonymous_variant	4/21

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CAPN3	ENST00000397163.8	c.525C>T	p.Asp175=	synonymous_variant	4/24	1	NM_000070.3	P2

Frequencies

GnomAD3 genomes AF: 0.000624 AC: 95 AN: 152156 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000458

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.000188

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00113

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000620 AC: 156 AN: 251452 Hom.: 0 AF XY: 0.000655 AC XY: 89 AN XY: 135890

Gnomad AFR exome AF: 0.000246

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000392

Gnomad FIN exome AF: 0.000323

Gnomad NFE exome AF: 0.00114

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.000989 AC: 1446 AN: 1461870 Hom.: 2 Cov.: 32 AF XY: 0.000997 AC XY: 725 AN XY: 727240

Gnomad4 AFR exome AF: 0.000179

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000533

Gnomad4 FIN exome AF: 0.000449

Gnomad4 NFE exome AF: 0.00121

Gnomad4 OTH exome AF: 0.000430

GnomAD4 genome AF: 0.000624 AC: 95 AN: 152274 Hom.: 0 Cov.: 32 AF XY: 0.000618 AC XY: 46 AN XY: 74446

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.000458

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.000188

Gnomad4 NFE AF: 0.00113

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.00122 Hom.: 0

Bravo AF: 0.000661

EpiCase AF: 0.000927

EpiControl AF: 0.00119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

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

Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Apr 17, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 29, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not provided Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jul 03, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 01, 2019	- -

Limb-Girdle Muscular Dystrophy, Recessive Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

Athena Diagnostics

Dec 22, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.51
Cadd	Benign	6.0
Dann	Benign	0.79

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.20		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.20		Position offset: -26

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

Publications

LitVar

Other links and lift over

dbSNP: rs144383442; hg19: chr15-42679977; COSMIC: COSV58825884;