NM_000070.3:c.985G>A

Variant names:

• chr15-42392678-G-A
• rs1085307995
• NM_000070.3:c.985G>A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000070.3(CAPN3):​c.985G>A​(p.Gly329Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,714 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 (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CAPN3 NM_000070.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 4.78

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]

ENSG00000258461 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.968
• PP5: Variant 15-42392678-G-A is Pathogenic according to our data. Variant chr15-42392678-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 427161.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr15-42392678-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CAPN3	NM_000070.3	c.985G>A	p.Gly329Arg	missense_variant	Exon 7 of 24	ENST00000397163.8	NP_000061.1
CAPN3	NM_024344.2	c.985G>A	p.Gly329Arg	missense_variant	Exon 7 of 23		NP_077320.1
CAPN3	NM_173087.2	c.841G>A	p.Gly281Arg	missense_variant	Exon 6 of 21		NP_775110.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CAPN3	ENST00000397163.8	c.985G>A	p.Gly329Arg	missense_variant	Exon 7 of 24	1	NM_000070.3	ENSP00000380349.3
ENSG00000258461	ENST00000495723.1	n.*781G>A		non_coding_transcript_exon_variant	Exon 11 of 26	2		ENSP00000492063.1
ENSG00000258461	ENST00000495723.1	n.*781G>A		3_prime_UTR_variant	Exon 11 of 26	2		ENSP00000492063.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461714 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727162

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

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

Mar 25, 2024

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Mar 01, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 329 of the CAPN3 protein (p.Gly329Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal recessive limb-girdle muscular dystrophy (LGMD) (PMID: 21520333, 28915917; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 427161). 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 with a positive predictive value of 95%. Experimental studies have shown that this missense change affects CAPN3 function (PMID: 16627476). For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:1

May 11, 2015

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The G329R variant was previously reported in a patient with limb-girdle muscular dystrophy type 2A (LGMD2A) who had a second variant on the other allele (CAPN3 LOVD). It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The G329R variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species, and multiple missense variants in nearby residues (V320F, Y322H, G333D, H334Y/L/Q) have also been reported in the Human Gene Mutation Database in association with limb-girdle muscular dystrophy (Stenson et al., 2014). In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Therefore, this variant is a strong candidate for a pathogenic variant, however the possibility that it is a benign variant cannot be excluded. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.41
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.66	D;.;.;D
Eigen	Uncertain	0.67
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D;D;D;D
M_CAP	Pathogenic	0.61	D
MetaRNN	Pathogenic	0.97	D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.1	.;M;.;M
PrimateAI	Uncertain	0.67	T
PROVEAN	Uncertain	-3.5	.;D;D;D
REVEL	Pathogenic	0.86
Sift	Uncertain	0.018	.;D;T;D
Sift4G	Uncertain	0.053	T;D;D;D
Polyphen		1.0	.;D;D;D
Vest4		0.85
MutPred		0.83		.;Gain of MoRF binding (P = 0.0064);.;Gain of MoRF binding (P = 0.0064);
MVP		0.96
MPC		0.69
ClinPred		0.99	D
GERP RS		4.4
Varity_R		0.97
gMVP		0.94

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs1085307995; hg19: chr15-42684876; COSMIC: COSV58823750;