15-42410446-C-T

Position:

• chr15-42410446-C-T

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000070.3(CAPN3):​c.2134C>T​(p.Leu712Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,868 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. L712L) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: CAPN3 NM_000070.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 1.84

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 16 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_000070.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.977
• PP5: Variant 15-42410446-C-T is Pathogenic according to our data. Variant chr15-42410446-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 195450.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr15-42410446-C-T is described in Lovd as [Pathogenic]. Variant chr15-42410446-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CAPN3	NM_000070.3	c.2134C>T	p.Leu712Phe	missense_variant	20/24	ENST00000397163.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CAPN3	ENST00000397163.8	c.2134C>T	p.Leu712Phe	missense_variant	20/24	1	NM_000070.3	P2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461868 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727232

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 30, 2016	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Athena Diagnostics	Apr 15, 2020	Not found in the total gnomAD dataset, and the data is high quality. Found in at least one patient with expected phenotype for this gene. Predicted to have a damaging effect on the protein. In multiple individuals, this variant has been seen with a single recessive pathogenic variant in the same gene, suggesting this variant may also be pathogenic. -

Muscular dystrophy, limb-girdle, autosomal dominant 4 Pathogenic:1

Pathogenic, flagged submission

clinical testing

Baylor Genetics

Jun 15, 2023

- -

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

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Nov 01, 2022

For these reasons, this variant has been classified as Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CAPN3 protein function. ClinVar contains an entry for this variant (Variation ID: 195450). This missense change has been observed in individual(s) with clinical features of autosomal recessive limb-girdle muscular dystrophy (PMID: 17562833, 30919934). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 712 of the CAPN3 protein (p.Leu712Phe). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.29
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	T;.;.;D;.;.;.;.;.;.;.;.
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D;.;D;.;D;.;D
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.66	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.64	T
REVEL	Pathogenic	0.85
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D;D;D;D;D;D
Polyphen		0.99, 0.99	.;D;D;D;.;.;.;.;.;.;.;.
Vest4		0.84
MutPred		0.92		.;.;.;Gain of methylation at K711 (P = 0.0466);.;.;.;.;.;.;.;.;
MVP		0.95
MPC		0.62
ClinPred		1.0	D
GERP RS		3.8
Varity_R		0.76
gMVP		0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs794727318; hg19: chr15-42702644;