NM_000256.3:c.2217G>A

Variant names:

• chr11-47338611-C-T
• rs786204348
• NM_000256.3:c.2217G>A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Moderate BP6 BP7

The NM_000256.3(MYBPC3):​c.2217G>A​(p.Glu739Glu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYBPC3 NM_000256.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 0.0520

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_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.32).
• BP6: Variant 11-47338611-C-T is Benign according to our data. Variant chr11-47338611-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 407331.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.
• BP7: Synonymous conserved (PhyloP=0.052 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYBPC3	NM_000256.3	c.2217G>A	p.Glu739Glu	synonymous_variant	Exon 23 of 35	ENST00000545968.6	NP_000247.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYBPC3	ENST00000545968.6	c.2217G>A	p.Glu739Glu	synonymous_variant	Exon 23 of 35	5	NM_000256.3	ENSP00000442795.1
MYBPC3	ENST00000399249.6	c.2217G>A	p.Glu739Glu	synonymous_variant	Exon 22 of 34	5		ENSP00000382193.2
MYBPC3	ENST00000544791.1	n.2217G>A		non_coding_transcript_exon_variant	Exon 23 of 27	5		ENSP00000444259.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hypertrophic cardiomyopathy;C1960469:Left ventricular noncompaction Uncertain:1

Oct 15, 2020

Petrovsky National Research Centre of Surgery, The Federal Agency for Scientific Organizations

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

We observed a c.2217G>A (p.E739K) genetic variant in a 39-y.o. female patient with left ventricular non-compaction and myocardium hypertrophy. Additionally, in a proband we observed the genetic variant p.Q1233*, also in MYBPC3 gene. Both genetic variants were in a heterozygous state. The p.E739K genetic variant was classified as probably pathogenic by various online resources. However, in the absence of family screening results and functional studies, the genetic variant p.E739K could be classified as the variant of unknown clinical significance only. -

Hypertrophic cardiomyopathy Benign:1

Dec 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.32
CADD	Benign	7.6
DANN	Benign	0.58

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: rs786204348; hg19: chr11-47360162;