rs267606907

chr14-23396329-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PP2 PP3 BS2

The NM_002471.4(MYH6):c.2384G>A(p.Arg795Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000294 in 1,461,806 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R795W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000029 (0 hom.)
• Consequence: MYH6 NM_002471.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts P:1 U:4
• Conservation: PhyloP100: 6.00

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]

(HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PP2: Missense variant where missense usually causes diseases, MYH6
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.831
• BS2: High AC in GnomAdExome at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH6	NM_002471.4	c.2384G>A	p.Arg795Gln	missense_variant	20/39	ENST00000405093.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH6	ENST00000405093.9	c.2384G>A	p.Arg795Gln	missense_variant	20/39	5	NM_002471.4	P1
	ENST00000702194.1			upstream_gene_variant

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000398 AC: 10 AN: 251344 Hom.: 0 AF XY: 0.0000442 AC XY: 6 AN XY: 135852

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.000595

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000294 AC: 43 AN: 1461806 Hom.: 0 Cov.: 32 AF XY: 0.0000371 AC XY: 27 AN XY: 727208

Gnomad4 AFR exome AF: 0.0000597

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.000612

Gnomad4 EAS exome AF: 0.0000756

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000135

Gnomad4 OTH exome AF: 0.0000993

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000865 Hom.: 0

Bravo AF: 0.0000227

ExAC AF: 0.0000330 AC: 4

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypertrophic cardiomyopathy 14 Pathogenic:1 Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Dec 29, 2020	Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. This variant has been observed in an individual with late-onset hypertrophic cardiomyopathy (PMID: 11815426). ClinVar contains an entry for this variant (Variation ID: 14147). This variant is present in population databases (rs267606907, ExAC 0.02%). This sequence change replaces arginine with glutamine at codon 795 of the MYH6 protein (p.Arg795Gln). The arginine residue is moderately conserved and there is a small physicochemical difference between arginine and glutamine. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 29, 2002	- -

Dilated cardiomyopathy 1EE;C2750467:Hypertrophic cardiomyopathy 14;C3279790:Atrial septal defect 3;C3279791:Sick sinus syndrome 3, susceptibility to;C3495498:Hypertrophic cardiomyopathy 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 10, 2021

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Feb 08, 2023

Identified in patients with HCM in published literature (Niimura et al., 2002; Chung et al., 2021); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 28518168, 33658040, 33407484, 11815426) -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 29, 2021

The p.R795Q variant (also known as c.2384G>A), located in coding exon 18 of the MYH6 gene, results from a G to A substitution at nucleotide position 2384. The arginine at codon 795 is replaced by glutamine, an amino acid with highly similar properties. This variant was reported in one individual from a late onset hypertrophic cardiomyopathy (HCM) cohort, as well as in an exome cohort with cardiovascular details not provided (Niimura H et al. Circulation, 2002 Jan;105:446-51; Whiffin N et al. Genet Med, 2017 10;19:1151-1158). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Pathogenic	0.31
Cadd	Pathogenic	28
Dann	Pathogenic	1.0
DEOGEN2	Pathogenic	0.89	D;D
Eigen	Pathogenic	0.72
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.84	T;.
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.83	D;D
MetaSVM	Pathogenic	0.87	D
MutationAssessor	Pathogenic	3.5	H;H
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.71	T
PROVEAN	Uncertain	-2.9	D;D
REVEL	Pathogenic	0.75
Sift	Benign	0.054	T;T
Sift4G	Uncertain	0.0070	D;D
Polyphen		1.0	D;D
Vest4		0.72
MVP		0.85
MPC		1.2
ClinPred		0.95	D
GERP RS		4.8
Varity_R		0.21
gMVP		0.94

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: rs267606907; hg19: chr14-23865538;