rs730880535

Positions:

• chr11-47343063-C-A
• chr11-47343063-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM5

The NM_000256.3(MYBPC3):​c.1309G>T​(p.Val437Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000822 in 1,460,644 control chromosomes in the GnomAD database, including 1 homozygotes. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V437M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000082 (1 hom.)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.610

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 Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a domain Ig-like C2-type 2 (size 90) in uniprot entity MYPC3_HUMAN there are 25 pathogenic changes around while only 8 benign (76%) in NM_000256.3
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-47343063-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.1309G>T	p.Val437Leu	missense_variant	15/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.1309G>T	p.Val437Leu	missense_variant	15/35	5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.1309G>T	p.Val437Leu	missense_variant	14/34	5		A2
MYBPC3	ENST00000544791.1	c.1309G>T	p.Val437Leu	missense_variant, NMD_transcript_variant	15/27	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000822 AC: 12 AN: 1460644 Hom.: 1 Cov.: 31 AF XY: 0.0000138 AC XY: 10 AN XY: 726504

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: 0.0000465

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000720

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ExAC AF: 0.0000165 AC: 2

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
CardioboostCm	Uncertain	0.12
BayesDel_addAF	Benign	-0.015	T
BayesDel_noAF	Benign	-0.26
CADD	Benign	14
DANN	Benign	0.83
DEOGEN2	Benign	0.25	T;T;T
Eigen	Benign	-0.74
Eigen_PC	Benign	-0.79
FATHMM_MKL	Benign	0.56	D
LIST_S2	Uncertain	0.87	D;D;D
M_CAP	Uncertain	0.26	D
MetaRNN	Uncertain	0.51	D;D;D
MetaSVM	Benign	-0.57	T
MutationAssessor	Uncertain	2.4	M;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.8	N;N;N
REVEL	Uncertain	0.30
Sift	Benign	0.16	T;D;T
Sift4G	Uncertain	0.047	D;D;D
Vest4		0.63
MVP		0.71
MPC		0.40
ClinPred		0.17	T
GERP RS		1.8
Varity_R		0.13
gMVP		0.52

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.31		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.31		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: rs730880535; hg19: chr11-47364614;