14-23403367-G-T

Variant names:

• chr14-23403367-G-T
• rs752600386
• NM_002471.4:c.879C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_002471.4(MYH6):​c.879C>A​(p.Asn293Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N293Y) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: MYH6 NM_002471.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.11
• Publications: 1 publications found

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]

MYH6 Gene-Disease associations (from GenCC):

• hypertrophic cardiomyopathy 14

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Laboratory for Molecular Medicine
• Keppen-Lubinsky syndrome

  Inheritance: AD Classification: MODERATE Submitted by: Illumina
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• atrial septal defect 3

  Inheritance: AD Classification: LIMITED Submitted by: G2P
• dilated cardiomyopathy

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

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYH6	NM_002471.4	c.879C>A	p.Asn293Lys	missense_variant	Exon 10 of 39	ENST00000405093.9	NP_002462.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYH6	ENST00000405093.9	c.879C>A	p.Asn293Lys	missense_variant	Exon 10 of 39	5	NM_002471.4	ENSP00000386041.3
MYH6	ENST00000557461.2	n.946C>A		non_coding_transcript_exon_variant	Exon 10 of 14	5

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.41
BayesDel_addAF	Benign	-0.094	T
BayesDel_noAF	Benign	-0.37
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.78	D;D
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.25
FATHMM_MKL	Uncertain	0.79	D
LIST_S2	Benign	0.76	T;.
M_CAP	Benign	0.082	D
MetaRNN	Uncertain	0.44	T;T
MetaSVM	Benign	-0.36	T
MutationAssessor	Benign	1.9	M;M
PhyloP100		1.1
PrimateAI	Uncertain	0.73	T
PROVEAN	Uncertain	-3.5	D;D
REVEL	Benign	0.29
Sift	Uncertain	0.0090	D;D
Sift4G	Uncertain	0.025	D;D
Polyphen		0.18	B;B
Vest4		0.50
MutPred		0.54		Gain of catalytic residue at N293 (P = 5e-04);Gain of catalytic residue at N293 (P = 5e-04);
MVP		0.73
MPC		0.98
ClinPred		0.95	D
GERP RS		3.0
Varity_R		0.42
gMVP		0.66
Mutation Taster		=54/46	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: rs752600386; hg19: chr14-23872576;