rs730880573

Variant names:

• chr11-47351485-G-A
• rs730880573
• NM_000256.3:c.46C>T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 1P and 0B. PP3

The NM_000256.3(MYBPC3):​c.46C>T​(p.Pro16Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000974 in 1,437,692 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 Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000097 (0 hom.)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5
• Conservation: PhyloP100: 9.37

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 1 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.807

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYBPC3	NM_000256.3	c.46C>T	p.Pro16Ser	missense_variant	Exon 2 of 35	ENST00000545968.6	NP_000247.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYBPC3	ENST00000545968.6	c.46C>T	p.Pro16Ser	missense_variant	Exon 2 of 35	5	NM_000256.3	ENSP00000442795.1
MYBPC3	ENST00000399249.6	c.46C>T	p.Pro16Ser	missense_variant	Exon 2 of 34	5		ENSP00000382193.2
MYBPC3	ENST00000544791.1	n.46C>T		non_coding_transcript_exon_variant	Exon 2 of 27	5		ENSP00000444259.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000171 AC: 4 AN: 234360 Hom.: 0 AF XY: 0.0000156 AC XY: 2 AN XY: 128092

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000298

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000285

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000974 AC: 14 AN: 1437692 Hom.: 0 Cov.: 36 AF XY: 0.0000113 AC XY: 8 AN XY: 710534

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000228

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: 0.0000119

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000381 Hom.: 0

Bravo AF: 0.0000189

ExAC AF: 0.0000166 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Apr 05, 2019

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Pro16Ser variant in MYBPC3 has not been previously reported in individuals with cardiomyopathy, but has been identified in 1/47636 European chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs730880573). Computational prediction tools and conservation analysis suggest that the variant may impact the protein, though this information is not predictive enough to determine pathogenicity. In summary, the clinical significance of the p.Pro16Ser variant is uncertain. -

Apr 27, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function -

Hypertrophic cardiomyopathy 4;C3715165:Left ventricular noncompaction 10 Uncertain:1

Apr 14, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hypertrophic cardiomyopathy Uncertain:1

Dec 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 16 of the MYBPC3 protein (p.Pro16Ser). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with MYBPC3-related conditions. ClinVar contains an entry for this variant (Variation ID: 180979). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype Uncertain:1

Apr 08, 2025

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2, PS4_supp -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.65
CardioboostCm	Uncertain	0.13
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
CADD	Pathogenic	26
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.40	T;T;T
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.81	D;D;D
MetaSVM	Uncertain	-0.19	T
MutationAssessor	Pathogenic	3.0	M;.;.
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-3.1	D;D;D
REVEL	Uncertain	0.36
Sift	Uncertain	0.0070	D;D;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0	D;.;.
Vest4		0.73
MutPred		0.59		Gain of phosphorylation at P16 (P = 0.0103);Gain of phosphorylation at P16 (P = 0.0103);Gain of phosphorylation at P16 (P = 0.0103);
MVP		0.90
MPC		0.83
ClinPred		0.80	D
GERP RS		4.3
Varity_R		0.63
gMVP		0.64

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs730880573; hg19: chr11-47373036;