MYBPC3 p.Arg502Trp

Variant names:

• chr11-47342698-G-A
• rs375882485
• NM_000256.3:c.1504C>T
• MYBPC3 p.Arg502Trp

GermlineCancer (beta)

Variant summary

Our verdict is Pathogenic.

+12 Pathogenic

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 12 classification points (ACMG Germline Pathogenicity v2019). PS3PM1PM5PP5_Strong

The NM_000256.3(MYBPC3):c.1504C>T (p.Arg502Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a cumulative frequency of 0.000144 (AC=233) in the gnomAD database across 1,613,896 control chromosomes (no homozygotes observed). The grpmax filtering allele frequency (95% CI) is 0.000167. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic/Likely Pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV004834613: "A functional study has shown that this variant causes a loss of protein function with no evidence of the transcript or protein degradation and may alter kinetics of cardiac muscle contraction and relaxation (PMID:30554920)."" and additional evidence is available in ClinVar. A different missense at the same amino acid position has been reported as Pathogenic/Likely Pathogenic in ClinVar: p.R502Q: Pathogenic (ClinVar VariationId 42541, 3 stars) Other variants at the same amino acid position have been reported in ClinVar (not pathogenic): p.R502= (synonymous): Likely_benign (ClinVar VariationId 629638, 1 star) This exact variant is curated in the UniProt human variants database as Uncertain Significance.

• Frequency:
  • Genomes: 𝑓 0.000085 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00015 (0 hom.)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:39 O:2
• Conservation: PhyloP100: 4.49
• Publications: 84 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: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• 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, G2P
• atrial fibrillation

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

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

  Inheritance: AD, AR Classification: LIMITED Submitted by: ClinGen
• familial dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: G2P

Classification according to ACMG Germline Pathogenicity v2019

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

Classification was made for transcript:

Our verdict: Pathogenic. The variant received 12 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	PS3Functional studies show damaging effect		Well-established functional study supports damaging effect (PS3); SCV004834613: "A functional study has shown that this variant causes a loss of protein function with no evidence of the transcript or protein degradation and may alter kinetics of cardiac muscle contraction and relaxation (PMID: 30554920)."; SCV000208031: Published functional studies using cardiomyocytes derived from induced pluripotent stem cells demonstrate R502W alters protein function (Cohn et al., 2019);; SCV000604327: Functional analyses suggest the variant protein has impaired interaction with sarcomeric binding partner proteins (Zhang 2014). PMID: 25058872.; SCV000696313: Structure study predicted the R502W mutation and other HCM-linked mutations found within the same C3 domain, may directly disrupt the interaction of cMyBP-C with other sarcomeric proteins (Zhang_2014).; SCV001357620: "A functional study has shown that this variant causes a loss of protein function with no evidence of the transcript or protein degradation, and may alter kinetics of cardiac muscle contraction and relaxation (PMID: 30554920)."
	PM1Mutational hot spot or critical domain		Missense neighbourhood hotspot (≥2 P/LP within ±8 AA, OR ≥ 5 vs. background) — PM1; In-domain: 0 pathogenic, 0 benign rare missense variants.; ±8 AA neighbourhood: 4 pathogenic, 1 benign (OR vs. background: 15.0).
	PM5Novel missense at known pathogenic residue		Different pathogenic missense at same AA residue in ClinVar (PM5); ClinVar contains a germline Pathogenic/Likely Pathogenic entry at the same amino acid position with a different amino acid change: p.R502Q: Pathogenic (ClinVar VariationId 42541, 3 stars); Other variants at the same amino acid residue (not pathogenic): p.R502= (synonymous): Likely_benign (ClinVar VariationId 629638, 1 star)
	PP5Reputable source reports pathogenic		ClinVar 2-star pathogenic — strong (PP5); ClinVar submissions overwhelmingly pathogenic (≥10 total, ≥80% P/LP, <10% B/LB) — strong (PP5, count-based); ClinVar germline classification: Pathogenic/Likely Pathogenic, 2 star(s). ClinVar submissions strongly and reliably favor pathogenicity (39/39 total P/LP).

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_000256.3. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	MYBPC3 NM_000256.3	MANE Select	c.1504C>T p.Arg502Trp	missense	Exon 17 of 35	Prot: NP_000247.2 UniProt:

MYBPC3 NM_000256.3

MANE Select

HGVSc / HGVSpc.1504C>Tp.Arg502Trp

Exon rankExon 17 of 35

missense

Prot: NP_000247.2UniProt: Q14896-1A5YM48

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	MYBPC3 ENST00000545968.6	TSL:5MANE Select	c.1504C>T p.Arg502Trp	missense	Exon 17 of 35	Prot: ENSP00000442795.1 UniProt:
	MYBPC3 ENST00000399249.6	TSL:5	c.1504C>T p.Arg502Trp	missense	Exon 16 of 34	Prot: ENSP00000382193.2 UniProt:
	MYBPC3 ENST00000544791.1	TSL:5	n.1504C>T	non_coding_transcript_exon	Exon 17 of 27	Prot: ENSP00000444259.1 UniProt:

MYBPC3 ENST00000545968.6

TSL:5MANE Select

HGVSc / HGVSpc.1504C>Tp.Arg502Trp

Exon rankExon 17 of 35

missense

Prot: ENSP00000442795.1UniProt: Q14896-1

MYBPC3 ENST00000399249.6

TSL:5

HGVSc / HGVSpc.1504C>Tp.Arg502Trp

Exon rankExon 16 of 34

missense

Prot: ENSP00000382193.2UniProt: A8MXZ9

MYBPC3 ENST00000544791.1

TSL:5

HGVSc / HGVSpn.1504C>T

Exon rankExon 17 of 27

non_coding_transcript_exon

Prot: ENSP00000444259.1UniProt: F5GZR4

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 6 sources Large-scale international reference populations
GnomAD3 genomes	AF: 0.0000854	AC:13	Hom:0	AN:152198	Cov:33
GnomAD2 exomes	AF: 0.0000401	AC:10	Hom:	AN:249240	Cov:
GnomAD4 exome	AF: 0.000151	AC:220	Hom:0	AN:1461698	Cov:31
GnomAD4 genome	AF: 0.0000854	AC:13	Hom:0	AN:152198	Cov:33
TOPMed (Bravo)	AF: 0.0000756	AC:	Hom:	AN:	Cov:
ALFA (dbGaP/dbSNP Allele Frequency Aggregator)	AF: 0.000121	AC:28	Hom:0	AN:232282	Cov:
Local & regional cohorts 3 sources Population-specific and national genomic databases
ESP6500 (Exome Variant Server)	AF: 0.0000779	AC:1	Hom:	AN:12838	Cov:
ToMMo 61KJPN (+60KJPN MNV)	AF: 0.0000160	AC:2	Hom:0	AN:122464	Cov:
UK10K	AF: 0.000264	AC:2	Hom:	AN:7562	Cov:

Showing 9 sources

Case/control cohorts

Cohort	Cases			Controls
	AF	AC	AN	AF	AC	AN
BipEx(Bipolar disorder (including schizoaffective))	0.0000352	1	28420	0.000208	6	28844
Epi25(Epilepsy)	0.000167	7	41958	0.0000598	4	66888
SCHEMA(Schizophrenia)	0.0000985	12	121836	0.0000630	12	190566

Showing 3 cohortsAllele count / allele number. AF is computed from the counts for ASC (not provided by the source).

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
13	-	-	not provided (13)
9	-	-	Hypertrophic cardiomyopathy 4 (9)
5	-	-	Hypertrophic cardiomyopathy (6)
3	-	-	Cardiovascular phenotype (3)
3	-	-	MYBPC3-related disorder (3)
2	-	-	Cardiomyopathy (2)
1	-	-	Hypertrophic cardiomyopathy 1 (1)
1	-	-	Left ventricular noncompaction 10 (1)
1	-	-	MYBPC3-related cardiomyopathies (1)
1	-	-	Primary familial hypertrophic cardiomyopathy (1)
-	-	-	Hypertrophic cardiomyopathy 4;C3715165:Left ventricular noncompaction 10 (1)

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Pathogenic	24
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.34
CADD	Pathogenic	30
CardioboostCm	Pathogenic	0.93
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.80	D
Eigen	Uncertain	0.62
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.96	D
GPN-Star LLR	N/A	-6.9
GPN-Star score	N/A	6.6
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	0.12	D
Mutation Taster	N/A	0/100	disease causing (ClinVar)
MutationAssessor	Pathogenic	3.5	H
PhyloP100	Uncertain	4.5
popEVE	Benign	-3.5
PrimateAI	Uncertain	0.73	T
PROVEAN	Pathogenic	-6.6	D
REVEL	Uncertain	0.64
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Varity_R	N/A	0.72
VESM-3B	Benign	-11

Showing 28 of 28 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.020
SpliceAI score (max)	Benign	0.0	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs375882485;

hg19: chr11-47364249;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar