15-42394255-G-T

Variant names:

• chr15-42394255-G-T
• rs1555421263
• NM_000070.3:c.1030-1G>T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000070.3(CAPN3):​c.1030-1G>T variant causes a splice acceptor, intron change. The variant allele was found at a frequency of 0.00000356 in 1,403,510 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000036 (0 hom.)
• Consequence: CAPN3 NM_000070.3 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.84
• Publications: 0 publications found

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]

CAPN3 Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• autosomal recessive limb-girdle muscular dystrophy type 2A

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Myriad Women’s Health, Labcorp Genetics (formerly Invitae)
• muscular dystrophy, limb-girdle, autosomal dominant 4

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• muscular dystrophy, limb-girdle, autosomal dominant

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ENSG00000258461 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 7, offset of 13, new splice context is: gcttaatgtcccgttcaaAGgtg. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-42394255-G-T is Pathogenic according to our data. Variant chr15-42394255-G-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3241003.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CAPN3	NM_000070.3	c.1030-1G>T		splice_acceptor_variant, intron_variant	Intron 7 of 23	ENST00000397163.8	NP_000061.1
CAPN3	NM_024344.2	c.1030-1G>T		splice_acceptor_variant, intron_variant	Intron 7 of 22		NP_077320.1
CAPN3	NM_173087.2	c.886-1G>T		splice_acceptor_variant, intron_variant	Intron 6 of 20		NP_775110.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CAPN3	ENST00000397163.8	c.1030-1G>T		splice_acceptor_variant, intron_variant	Intron 7 of 23	1	NM_000070.3	ENSP00000380349.3
ENSG00000258461	ENST00000495723.1	n.*826-1G>T		splice_acceptor_variant, intron_variant	Intron 11 of 25	2		ENSP00000492063.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000356 AC: 5 AN: 1403510 Hom.: 0 Cov.: 31 AF XY: 0.00000144 AC XY: 1 AN XY: 692626

African (AFR) AF: 0.00 AC: 0 AN: 31908

American (AMR) AF: 0.00 AC: 0 AN: 36132

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25210

East Asian (EAS) AF: 0.00 AC: 0 AN: 36226

South Asian (SAS) AF: 0.00 AC: 0 AN: 79476

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49618

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5704

European-Non Finnish (NFE) AF: 0.00000463 AC: 5 AN: 1081036

Other (OTH) AF: 0.00 AC: 0 AN: 58200

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Jan 11, 2024

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Uncertain	0.030
CADD	Pathogenic	32
DANN	Uncertain	0.98
Eigen	Pathogenic	0.88
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		4.8
GERP RS		5.4

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.95
SpliceAI score (max)		0.80		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.77		Position offset: 14
DS_AL_spliceai		0.80		Position offset: 1

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

Other links and lift over

dbSNP: rs1555421263; hg19: chr15-42686453;