rs1329919535

chr11-47342016-G-Achr11-47342016-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM5 PP3_Strong

The NM_000256.3(MYBPC3):c.1765C>T(p.Arg589Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000769 in 1,430,368 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R589H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000077 (0 hom.)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:4
• Conservation: PhyloP100: 2.44

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 Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a domain Ig-like C2-type 4 (size 89) in uniprot entity MYPC3_HUMAN there are 43 pathogenic changes around while only 10 benign (81%) in NM_000256.3
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-47342016-G-C is described in Lovd as [Likely_pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.947

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.1765C>T	p.Arg589Cys	missense_variant	18/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.1765C>T	p.Arg589Cys	missense_variant	18/35	5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.1765C>T	p.Arg589Cys	missense_variant	17/34	5		A2
MYBPC3	ENST00000544791.1	c.1765C>T	p.Arg589Cys	missense_variant, NMD_transcript_variant	18/27	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000997 AC: 2 AN: 200544 Hom.: 0 AF XY: 0.00000927 AC XY: 1 AN XY: 107850

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000231

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000769 AC: 11 AN: 1430368 Hom.: 0 Cov.: 32 AF XY: 0.00000847 AC XY: 6 AN XY: 708664

Gnomad4 AFR exome AF: 0.0000304

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000261

Gnomad4 SAS exome AF: 0.0000243

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000639

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypertrophic cardiomyopathy Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jan 16, 2022	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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 520358). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 25351510, 28408708, 28790153). This variant is present in population databases (no rsID available, gnomAD 0.002%). This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 589 of the MYBPC3 protein (p.Arg589Cys). -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Dec 01, 2023	This missense variant replaces arginine with cysteine at codon 589 of the MYBPC3 protein. Computational prediction suggests that this variant may have a deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in at least 2 individuals affected with hypertrophic cardiomyopathy (PMID: 25351510, 28408708). This variant has been identified in 2/200544 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 14, 2021

Identified in patients with HCM in the published literature; however, at least one individual harbored an additional cardiogenetic variant (Lopes et al., 2015; Burns et al., 2017); Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 520358; Landrum et al., 2016); This variant is associated with the following publications: (PMID: 28790153, 25351510) -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 30, 2017

The p.R589C variant (also known as c.1765C>T), located in coding exon 18 of the MYBPC3 gene, results from a C to T substitution at nucleotide position 1765. The arginine at codon 589 is replaced by cysteine, an amino acid with highly dissimilar properties. This alteration has been reported in two hypertrophic cardiomyopathy (HCM) cohorts; however, clinical details were limited (Lopes LR et al. Heart. 2015;101:294-301; Ingles J et al. Circ Cardiovasc Genet. 2017;10(2):e001620). Based on data from gnomAD, the T allele was reported in 2 of 197602 (0.001%) total alleles. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.63
CardioboostCm	Uncertain	0.76
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.41
Cadd	Pathogenic	30
Dann	Pathogenic	1.0
DEOGEN2	Pathogenic	0.89	D;T;T
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.95	D;D;D
M_CAP	Pathogenic	0.32	D
MetaRNN	Pathogenic	0.95	D;D;D
MetaSVM	Uncertain	0.55	D
MutationAssessor	Pathogenic	3.9	H;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.67	T
PROVEAN	Pathogenic	-7.1	D;.;D
REVEL	Pathogenic	0.83
Sift	Pathogenic	0.0	D;.;D
Sift4G	Pathogenic	0.0	D;D;D
Vest4		0.90
MVP		0.97
MPC		0.97
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.74
gMVP		0.90

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1329919535; hg19: chr11-47363567;