rs886037902

Variant names:

• chr11-47346368-TCC-T
• rs886037902
• NM_000256.3:c.927_928delGG

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PVS1 PM2 PP3 PP5_Very_Strong

The NM_000256.3(MYBPC3):​c.927_928delGG​(p.Asp310LeufsTer22) variant causes a frameshift, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYBPC3 NM_000256.3 frameshift, splice_region
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 2.90

Genes affected

MYBPC3 (HGNC:7551): (myosin binding protein C3) MYBPC3 encodes the cardiac isoform of myosin-binding protein C. Myosin-binding protein C is a myosin-associated protein found in the cross-bridge-bearing zone (C region) of A bands in striated muscle. MYBPC3 is expressed exclusively in heart muscle and is a key regulator of cardiac contraction. Mutations in this gene are a frequent cause of familial hypertrophic cardiomyopathy. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Pathogenic. Variant got 19 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 11-47346368-TCC-T is Pathogenic according to our data. Variant chr11-47346368-TCC-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 254155.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYBPC3	NM_000256.3	c.927_928delGG	p.Asp310LeufsTer22	frameshift_variant, splice_region_variant	Exon 12 of 35	ENST00000545968.6	NP_000247.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYBPC3	ENST00000545968.6	c.927_928delGG	p.Asp310LeufsTer22	frameshift_variant, splice_region_variant	Exon 12 of 35	5	NM_000256.3	ENSP00000442795.1
MYBPC3	ENST00000399249.6	c.927_928delGG	p.Asp310LeufsTer22	frameshift_variant, splice_region_variant	Exon 11 of 34	5		ENSP00000382193.2
MYBPC3	ENST00000544791.1	n.927_928delGG		splice_region_variant, non_coding_transcript_exon_variant	Exon 12 of 27	5		ENSP00000444259.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypertrophic cardiomyopathy 4 Pathogenic:1

Feb 09, 2016

Center for Medical Genetics Ghent, University of Ghent

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been identified in large population databases (Gnomad, 1000 Genomes, Go NL, Exome Variant Server) and is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The variant segregates with disease in two unrelated families. -

Hypertrophic cardiomyopathy Pathogenic:1

Oct 31, 2018

Center for Human Genetics, University of Leuven

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.61		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.35		Position offset: 0
DS_AL_spliceai		0.61		Position offset: 2

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

Publications

LitVar

Other links and lift over

dbSNP: rs886037902; hg19: chr11-47367919;