rs397516778

Positions:

• chr14-23382524-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_002471.4(MYH6):​c.5700G>C​(p.Lys1900Asn) 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 pathogenic 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: 0.730

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 5 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.867

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH6	NM_002471.4	c.5700G>C	p.Lys1900Asn	missense_variant	38/39	ENST00000405093.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH6	ENST00000405093.9	c.5700G>C	p.Lys1900Asn	missense_variant	38/39	5	NM_002471.4	P1
MYH6	ENST00000651452.1	n.927G>C		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

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 31, 2012

The Lys1900Asn variant in MYH6 has not been reported in the literature nor previ ously identified by our laboratory. Lysine (Lys) at position 1900 is highly cons erved in mammals and evolutionarily distant species, though computational analys es (biochemical amino acid properties, AlignGVGD, PolyPhen2, and SIFT) do not pr ovide strong support for or against an impact to the protein. Additional informa tion is needed to fully assess the clinical significance of the Lys1900Asn varia nt. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.89
BayesDel_addAF	Uncertain	0.022	T
BayesDel_noAF	Benign	-0.21
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.71	D;D
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Benign	0.66	D
LIST_S2	Uncertain	0.89	D;.
M_CAP	Uncertain	0.26	D
MetaRNN	Pathogenic	0.87	D;D
MetaSVM	Uncertain	0.50	D
MutationAssessor	Uncertain	2.7	M;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.76	T
PROVEAN	Uncertain	-3.4	D;D
REVEL	Uncertain	0.58
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.048	D;D
Polyphen		1.0	D;D
Vest4		0.84
MutPred		0.54		Loss of ubiquitination at K1900 (P = 0.0059);Loss of ubiquitination at K1900 (P = 0.0059);
MVP		0.90
MPC		0.99
ClinPred		0.99	D
GERP RS		3.2
Varity_R		0.63
gMVP		0.57

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: rs397516778; hg19: chr14-23851733;