rs727504523

chr11-47347478-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000256.3(MYBPC3):c.853G>A(p.Asp285Asn) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. 2/2 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYBPC3 NM_000256.3 missense, splice_region
• Scores: Splicing: ADA: 0.8815
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.17

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.853G>A	p.Asp285Asn	missense_variant, splice_region_variant	9/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.853G>A	p.Asp285Asn	missense_variant, splice_region_variant	9/35	5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.853G>A	p.Asp285Asn	missense_variant, splice_region_variant	9/34	5		A2
MYBPC3	ENST00000544791.1	c.853G>A	p.Asp285Asn	missense_variant, splice_region_variant, NMD_transcript_variant	9/27	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Apr 12, 2013

The Asp285Asn variant in MYBPC3 has not been reported in individuals with cardio myopathy. Data from large population studies is insufficient to assess the frequ ency of this variant. Computational analyses (biochemical amino acid properties, conservation, AlignGVGD, PolyPhen2, and SIFT) do not provide strong support for or against an impact to the protein. At this time, additional information is ne eded to fully assess the clinical significance of this variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
CardioboostCm	Uncertain	0.67
BayesDel_addAF	Benign	-0.054	T
BayesDel_noAF	Benign	-0.32
Cadd	Pathogenic	27
Dann	Uncertain	1.0
DEOGEN2	Benign	0.23	T;T;T
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.82	T;T;T
M_CAP	Pathogenic	0.37	D
MetaRNN	Uncertain	0.45	T;T;T
MetaSVM	Uncertain	-0.28	T
MutationAssessor	Uncertain	2.8	M;.;.
MutationTaster	Benign	0.99	D;D;D
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-2.0	N;N;N
REVEL	Benign	0.23
Sift	Uncertain	0.012	D;D;D
Sift4G	Uncertain	0.031	D;D;D
Polyphen		0.97	D;.;.
Vest4		0.24
MutPred		0.42		Gain of MoRF binding (P = 0.0858);Gain of MoRF binding (P = 0.0858);Gain of MoRF binding (P = 0.0858);
MVP		0.89
MPC		0.78
ClinPred		0.98	D
GERP RS		4.5
Varity_R		0.16
gMVP		0.34

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.88
dbscSNV1_RF	Benign	0.54
SpliceAI score (max)		0.060		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: rs727504523; hg19: chr11-47369029;