14-23386519-C-T

Position:

• chr14-23386519-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_002471.4(MYH6):​c.4755G>A​(p.Met1585Ile) variant causes a missense 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: MYH6 NM_002471.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.639

Genes affected

MYH6 (HGNC:7576): (myosin heavy chain 6) Cardiac muscle myosin is a hexamer consisting of two heavy chain subunits, two light chain subunits, and two regulatory subunits. This gene encodes the alpha heavy chain subunit of cardiac myosin. The gene is located approximately 4kb downstream of the gene encoding the beta heavy chain subunit of cardiac myosin. Mutations in this gene cause familial hypertrophic cardiomyopathy and atrial septal defect 3. [provided by RefSeq, Feb 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MYH6. . Gene score misZ 0.85843 (greater than the threshold 3.09). Trascript score misZ 4.1282 (greater than threshold 3.09). GenCC has associacion of gene with dilated cardiomyopathy, hypertrophic cardiomyopathy, Keppen-Lubinsky syndrome, atrial septal defect 3, familial isolated dilated cardiomyopathy, hypertrophic cardiomyopathy 14.
• BP4: Computational evidence support a benign effect (MetaRNN=0.12968725).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYH6	NM_002471.4	c.4755G>A	p.Met1585Ile	missense_variant	33/39	ENST00000405093.9	NP_002462.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYH6	ENST00000405093.9	c.4755G>A	p.Met1585Ile	missense_variant	33/39	5	NM_002471.4	ENSP00000386041	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 70

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypertrophic cardiomyopathy 14 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 01, 2016

In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a MYH6-related disease. This sequence change replaces methionine with isoleucine at codon 1585 of the MYH6 protein (p.Met1585Ile). The methionine residue is weakly conserved and there is a small physicochemical difference between methionine and isoleucine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Benign	-0.074	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	23
DANN	Benign	0.87
DEOGEN2	Benign	0.33	T;T
Eigen	Benign	-0.56
Eigen_PC	Benign	-0.32
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.81	T;.
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.13	T;T
MetaSVM	Benign	-0.85	T
MutationAssessor	Benign	-0.43	N;N
MutationTaster	Benign	0.99	D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	0.060	N;N
REVEL	Benign	0.20
Sift	Benign	1.0	T;T
Sift4G	Benign	0.66	T;T
Polyphen		0.0010	B;B
Vest4		0.25
MutPred		0.34		Gain of catalytic residue at M1585 (P = 0.1107);Gain of catalytic residue at M1585 (P = 0.1107);
MVP		0.52
MPC		0.29
ClinPred		0.19	T
GERP RS		4.3
Varity_R		0.19
gMVP		0.48

Splicing

Name	Calibrated prediction	Score	Prediction
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

Publications

LitVar

Other links and lift over

dbSNP: rs1060501427; hg19: chr14-23855728; COSMIC: COSV62448063; COSMIC: COSV62448063;