15-42409845-G-T

Variant names:

• chr15-42409845-G-T
• rs768374736
• NM_000070.3:c.2050+1G>T

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_000070.3(CAPN3):​c.2050+1G>T variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000157 in 1,272,654 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 0.0000016 (0 hom.)
• Consequence: CAPN3 NM_000070.3 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 10.0
• Publications: 4 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 10 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 3.3, offset of 29, new splice context is: gggGTgggt. 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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000070.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CAPN3	NM_000070.3	MANE Select	c.2050+1G>T		splice_donor intron	N/A	NP_000061.1
	CAPN3	NM_024344.2		c.2032+1G>T		splice_donor intron	N/A	NP_077320.1
	CAPN3	NM_173087.2		c.1774+1G>T		splice_donor intron	N/A	NP_775110.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CAPN3	ENST00000397163.8	TSL:1 MANE Select	c.2050+1G>T		splice_donor intron	N/A	ENSP00000380349.3
	CAPN3	ENST00000357568.8	TSL:1	c.2032+1G>T		splice_donor intron	N/A	ENSP00000350181.3
	CAPN3	ENST00000349748.8	TSL:1	c.1774+1G>T		splice_donor intron	N/A	ENSP00000183936.4

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251028 AF XY: 0.00000737

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000157 AC: 2 AN: 1272654 Hom.: 0 Cov.: 37 AF XY: 0.00000157 AC XY: 1 AN XY: 636152

African (AFR) AF: 0.00 AC: 0 AN: 28688

American (AMR) AF: 0.00 AC: 0 AN: 41826

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21680

East Asian (EAS) AF: 0.00 AC: 0 AN: 30920

South Asian (SAS) AF: 0.00 AC: 0 AN: 83344

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48474

Middle Eastern (MID) AF: 0.000198 AC: 1 AN: 5040

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 961760

Other (OTH) AF: 0.0000196 AC: 1 AN: 50922

GnomAD4 genome Cov.: 29

Alfa AF: 0.0000172 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	36
DANN	Uncertain	0.99
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.98
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		10
GERP RS		4.8
Mutation Taster		=0/100	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.93
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.70		Position offset: -26
DS_DL_spliceai		1.0		Position offset: -1

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

Other links and lift over

dbSNP: rs768374736; hg19: chr15-42702043;