NM_000256.3:c.3191-7C>T

Variant names:

• chr11-47333340-G-A
• rs373012629
• NM_000256.3:c.3191-7C>T

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_Strong BP6

The NM_000256.3(MYBPC3):​c.3191-7C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000425 in 1,410,228 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). The gene MYBPC3 is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000043 (0 hom.)
• Consequence: MYBPC3 NM_000256.3 splice_region, intron
• Scores: Splicing: ADA: 0.0001342
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4 B:4
• Conservation: PhyloP100: 1.10
• Publications: 1 publications found

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]

MYBPC3 Gene-Disease associations (from GenCC):

• hypertrophic cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• hypertrophic cardiomyopathy 4

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• left ventricular noncompaction 10

  Inheritance: AD, AR Classification: DEFINITIVE, MODERATE, LIMITED Submitted by: Ambry Genetics
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• atrial fibrillation

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• congenital heart disease

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• dilated cardiomyopathy

  Inheritance: AR, AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Specifications for MYBPC3 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• BP6: Variant 11-47333340-G-A is Benign according to our data. Variant chr11-47333340-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 304947.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000256.3. 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
	MYBPC3	NM_000256.3	MANE Select	c.3191-7C>T		splice_region intron	N/A	NP_000247.2	Q14896-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC3	ENST00000545968.6	TSL:5 MANE Select	c.3191-7C>T		splice_region intron	N/A	ENSP00000442795.1	Q14896-1
	MYBPC3	ENST00000399249.6	TSL:5	c.3191-7C>T		splice_region intron	N/A	ENSP00000382193.2	A8MXZ9

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000550 AC: 1 AN: 181902 AF XY: 0.0000102

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000128

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000425 AC: 60 AN: 1410228 Hom.: 0 Cov.: 34 AF XY: 0.0000417 AC XY: 29 AN XY: 696068

African (AFR) AF: 0.00 AC: 0 AN: 32356

American (AMR) AF: 0.00 AC: 0 AN: 38720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24442

East Asian (EAS) AF: 0.00 AC: 0 AN: 37506

South Asian (SAS) AF: 0.00 AC: 0 AN: 80220

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49860

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5634

European-Non Finnish (NFE) AF: 0.0000535 AC: 58 AN: 1083230

Other (OTH) AF: 0.0000343 AC: 2 AN: 58260

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000263 Hom.: 0

Bravo AF: 0.0000189

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	2	Hypertrophic cardiomyopathy (3)
-	1	1	Cardiomyopathy (2)
-	1	-	Dilated Cardiomyopathy, Dominant (1)
-	1	-	Left ventricular noncompaction cardiomyopathy (1)
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	8.4
DANN	Benign	0.58
PhyloP100		1.1
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00013
dbscSNV1_RF	Benign	0.0040
SpliceAI score (max)		0.010		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: rs373012629; hg19: chr11-47354891;