19-50435786-C-A

Variant names:

• chr19-50435786-C-A
• rs1355213778
• NM_004533.4:c.120C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_004533.4(MYBPC2):​c.120C>A​(p.Pro40Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,680 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P40P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: MYBPC2 NM_004533.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.961
• Publications: 0 publications found

Genes affected

MYBPC2 (HGNC:7550): (myosin binding protein C2) This gene encodes a member of the myosin-binding protein C family. This family includes the fast-, slow- and cardiac-type isoforms, each of which is a myosin-associated protein found in the cross-bridge-bearing zone (C region) of A bands in striated muscle. The protein encoded by this locus is referred to as the fast-type isoform. Mutations in the related but distinct genes encoding the slow-type and cardiac-type isoforms have been associated with distal arthrogryposis, type 1 and hypertrophic cardiomyopathy, respectively. [provided by RefSeq, Jul 2012]

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.61).
• BP7: Synonymous conserved (PhyloP=-0.961 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004533.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC2	NM_004533.4	MANE Select	c.120C>A	p.Pro40Pro	synonymous	Exon 3 of 28	NP_004524.3	A0A140VJQ0

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC2	ENST00000357701.6	TSL:1 MANE Select	c.120C>A	p.Pro40Pro	synonymous	Exon 3 of 28	ENSP00000350332.4	Q14324
	MYBPC2	ENST00000966357.1		c.120C>A	p.Pro40Pro	synonymous	Exon 3 of 28	ENSP00000636416.1
	MYBPC2	ENST00000966353.1		c.249C>A	p.Pro83Pro	synonymous	Exon 4 of 29	ENSP00000636412.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457680 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 724400

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33390

American (AMR) AF: 0.00 AC: 0 AN: 44448

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26026

East Asian (EAS) AF: 0.0000253 AC: 1 AN: 39560

South Asian (SAS) AF: 0.00 AC: 0 AN: 85710

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53246

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5752

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1109450

Other (OTH) AF: 0.00 AC: 0 AN: 60098

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.61
CADD	Benign	0.20
DANN	Benign	0.55
PhyloP100		-0.96

Splicing

Name	Calibrated prediction	Score	Prediction
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

Other links and lift over

dbSNP: rs1355213778; hg19: chr19-50939043;