11-47335074-G-T

Position:

• chr11-47335074-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_000256.3(MYBPC3):​c.2873C>A​(p.Thr958Asn) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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. T958I) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.48

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.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-47335074-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.2873C>A	p.Thr958Asn	missense_variant	27/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.2873C>A	p.Thr958Asn	missense_variant	27/35	5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.2873C>A	p.Thr958Asn	missense_variant	26/34	5		A2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypertrophic cardiomyopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 21, 2017

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 do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with MYBPC3-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with asparagine at codon 958 of the MYBPC3 protein (p.Thr958Asn). The threonine residue is moderately conserved and there is a small physicochemical difference between threonine and asparagine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.60
CardioboostCm	Benign	0.017
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	21
DANN	Benign	0.97
DEOGEN2	Benign	0.34	T;T;T
Eigen	Uncertain	0.24
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.81	T;T;T
M_CAP	Uncertain	0.23	D
MetaRNN	Uncertain	0.51	D;D;D
MetaSVM	Benign	-0.76	T
MutationAssessor	Benign	1.7	L;.;.
MutationTaster	Benign	0.61	N;N;N
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-1.9	N;N;N
REVEL	Benign	0.18
Sift	Benign	0.30	T;T;T
Sift4G	Uncertain	0.032	D;D;D
Vest4		0.36
MVP		0.89
MPC		0.60
ClinPred		0.64	D
GERP RS		5.2
Varity_R		0.41
gMVP		0.54

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs376504548; hg19: chr11-47356625;