NM_002465.4:c.776T>G

Variant names:

• chr12-101642529-T-G
• rs1421405659
• NM_002465.4:c.776T>G

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3_Moderate

The NM_002465.4(MYBPC1):​c.776T>G​(p.Leu259Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L259P) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYBPC1 NM_002465.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.67
• Publications: 6 publications found

Genes affected

MYBPC1 (HGNC:7549): (myosin binding protein C1) This gene encodes a member of the myosin-binding protein C family. Myosin-binding protein C family members are myosin-associated proteins found in the cross-bridge-bearing zone (C region) of A bands in striated muscle. The encoded protein is the slow skeletal muscle isoform of myosin-binding protein C and plays an important role in muscle contraction by recruiting muscle-type creatine kinase to myosin filaments. Mutations in this gene are associated with distal arthrogryposis type I. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

MYBPC1 Gene-Disease associations (from GenCC):

• arthrogryposis, distal, type 1B

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• myopathy, congenital, with tremor

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• lethal congenital contracture syndrome 4

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• digitotalar dysmorphism

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• lethal congenital contracture syndrome 3

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_002465.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-101642529-T-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 522829.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.878

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002465.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC1	NM_002465.4	MANE Select	c.776T>G	p.Leu259Arg	missense	Exon 11 of 32	NP_002456.2
	MYBPC1	NM_001404675.1		c.776T>G	p.Leu259Arg	missense	Exon 11 of 30	NP_001391604.1
	MYBPC1	NM_001254718.3		c.701T>G	p.Leu234Arg	missense	Exon 9 of 30	NP_001241647.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC1	ENST00000361466.7	TSL:1 MANE Select	c.776T>G	p.Leu259Arg	missense	Exon 11 of 32	ENSP00000354849.2
	MYBPC1	ENST00000361685.6	TSL:1	c.776T>G	p.Leu259Arg	missense	Exon 11 of 31	ENSP00000354845.2
	MYBPC1	ENST00000545503.6	TSL:1	c.701T>G	p.Leu234Arg	missense	Exon 9 of 30	ENSP00000440034.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.84
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.29
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.16	T
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Uncertain	0.29	D
MetaRNN	Pathogenic	0.88	D
MetaSVM	Uncertain	0.018	D
MutationAssessor	Pathogenic	3.3	M
PhyloP100		7.7
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-5.1	D
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.87
MutPred		0.68		Gain of catalytic residue at Y242 (P = 0.011)
MVP		0.87
MPC		2.7
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.85
gMVP		0.84
Mutation Taster		=19/81	disease causing

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

Other links and lift over

dbSNP: rs1421405659; hg19: chr12-102036307;