chr14-23382439-T-C

Position:

• chr14-23382439-T-C

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2 PP2 BP4_Strong

The NM_002471.4(MYH6):​c.5785A>G​(p.Ile1929Val) 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. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYH6 NM_002471.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.131

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 Likely_benign. 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=0.0433338).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH6	NM_002471.4	c.5785A>G	p.Ile1929Val	missense_variant	38/39	ENST00000405093.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH6	ENST00000405093.9	c.5785A>G	p.Ile1929Val	missense_variant	38/39	5	NM_002471.4	P1
MYH6	ENST00000651452.1	n.1012A>G		non_coding_transcript_exon_variant	2/3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

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

Jun 18, 2020

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. 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 and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with MYH6-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with valine at codon 1929 of the MYH6 protein (p.Ile1929Val). The isoleucine residue is weakly conserved and there is a small physicochemical difference between isoleucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	17
DANN	Benign	0.67
DEOGEN2	Benign	0.24	T;T
Eigen	Benign	-0.82
Eigen_PC	Benign	-0.70
FATHMM_MKL	Benign	0.20	N
LIST_S2	Benign	0.84	T;.
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.043	T;T
MetaSVM	Benign	-0.92	T
MutationAssessor	Benign	-0.34	N;N
MutationTaster	Benign	0.80	N;N
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-0.050	N;N
REVEL	Benign	0.17
Sift	Benign	1.0	T;T
Sift4G	Benign	0.80	T;T
Polyphen		0.0	B;B
Vest4		0.22
MutPred		0.12		Gain of MoRF binding (P = 0.1079);Gain of MoRF binding (P = 0.1079);
MVP		0.62
MPC		0.21
ClinPred		0.047	T
GERP RS		4.0
Varity_R		0.037
gMVP		0.17

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

Publications

LitVar

Other links and lift over

dbSNP: rs1890889294; hg19: chr14-23851648;