rs140732380

chr14-23405317-G-A

Variant summary

Our verdict is Benign. Variant got -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS2

The NM_002471.4(MYH6):c.408C>T(p.Ala136=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000434 in 1,614,128 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00024 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00045 (0 hom.)
• Consequence: MYH6 NM_002471.4 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: -8.62

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 Benign. Variant got -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 14-23405317-G-A is Benign according to our data. Variant chr14-23405317-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 239173.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-8.62 with no splicing effect.
• BS2: High AC in GnomAd at 37 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH6	NM_002471.4	c.408C>T	p.Ala136=	synonymous_variant	5/39	ENST00000405093.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH6	ENST00000405093.9	c.408C>T	p.Ala136=	synonymous_variant	5/39	5	NM_002471.4	P1
MYH6	ENST00000557461.2	n.475C>T		non_coding_transcript_exon_variant	5/14	5

Frequencies

GnomAD3 genomes AF: 0.000243 AC: 37 AN: 152190 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000193

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000382

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000183 AC: 46 AN: 251480 Hom.: 0 AF XY: 0.000184 AC XY: 25 AN XY: 135910

Gnomad AFR exome AF: 0.000308

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000316

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000454 AC: 664 AN: 1461820 Hom.: 0 Cov.: 34 AF XY: 0.000443 AC XY: 322 AN XY: 727212

Gnomad4 AFR exome AF: 0.0000896

Gnomad4 AMR exome AF: 0.000224

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000696

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.000555

Gnomad4 OTH exome AF: 0.000431

GnomAD4 genome AF: 0.000243 AC: 37 AN: 152308 Hom.: 0 Cov.: 32 AF XY: 0.000228 AC XY: 17 AN XY: 74488

Gnomad4 AFR AF: 0.000193

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000382

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000458 Hom.: 0

Bravo AF: 0.000219

EpiCase AF: 0.000654

EpiControl AF: 0.000533

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 05, 2024

- -

Hypertrophic cardiomyopathy 14 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 15, 2024

- -

Cardiomyopathy Benign:1

Benign, criteria provided, single submitter

clinical testing

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Feb 27, 2018

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Feb 08, 2019

- -

MYH6-related disorder Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 07, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Cardiovascular phenotype Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 04, 2018

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
Cadd	Benign	0.17
Dann	Benign	0.82

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: rs140732380; hg19: chr14-23874526;