Variant: NM_000257.4(MYH7):c.1208G>A (p.Arg403Gln)

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CA010365

14087 (ClinVar)

Gene: MYH7 (HGNC:4625)

Condition: hypertrophic cardiomyopathy

Inheritance Mode: Autosomal dominant inheritance

UUID: ae1c8298-2afe-4242-9a38-eea990986d41

Approved on: 2016-12-15

Published on: 2018-11-16

HGVS expressions

NM_000257.4(MYH7):c.1208G>A (p.Arg403Gln)
NM_000257.4:c.1208G>A
NC_000014.9:g.23429278C>T
CM000676.2:g.23429278C>T
NC_000014.8:g.23898487C>T
CM000676.1:g.23898487C>T
NC_000014.7:g.22968327C>T
NG_007884.1:g.11384G>A
ENST00000355349.4:c.1208G>A
ENST00000355349.3:c.1208G>A
NM_000257.3:c.1208G>A

Pathogenic

• Met criteria codes: PS3 PP1_Strong PS4 PP3 PM1 PM5 PM2

Expert Panel

Cardiomyopathy VCEP

Criteria Specification Information

Criteria Specification: ClinGen Cardiomyopathy Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for MYH7 Version 2.0.0

Evidence submitted by expert panel

Cardiomyopathy VCEP

The c.1208G>A (p.Arg403Gln) variant in MYH7 has been reported in >30 individuals with hypertrophic cardiomyopathy and segregated with disease in >30 affected family members (PS4 and PP1_Strong; PMID:1638703; PMID:1975517; PMID:7789380; PMID:12975413; PMID:24268868; PMID:10725281; PMID:20800588; PMID:12707239; PMID:27532257; AGCMC Sydney ClinVar SCV000692503.1; Invitae ClinVar SCV000253815.4; Partners LMM ClinVar SCV000059359.5; SHaRe consortium, PMID: 30297972). Mouse model indicates that this variant disrupts the function of MYH7 and leads to a phenotype consistent with HCM (PS3: PMID:8614836). This variant was absent from large population studies (PM2; http://exac.broadinstitute.org). This variant lies in the head region of the protein (aa 181-937) and missense variants in this region are statistically more likely to be disease-associated (PM1; PMID:27532257). Computational prediction tools and conservation analysis suggest that this variant may impact the protein (PP3). A different pathogenic missense variant has been previously identified at this codon which may indicate that this residue is critical to the function of the protein (PM5; c.1207C>T (p.Arg403Trp) - Variation ID 14102). In summary, this variant meets criteria to be classified as pathogenic for hypertrophic cardiomyopathy in an autosomal dominant manner. MYH7-specific ACMG/AMP criteria applied (PMID:29300372): PS3; PS4; PP1_ Strong; PM1; PM2; PM5; PP3

Met criteria codes

• PS3: In vivo mouse model with R403Q. Homozygous mice died 7 days after birth, heterozygous mice survived 1 year but had cardiac histopathology and dysfunction resembling HCM.
• PP1_Strong: >30 segregations (including ClinVar SCV000692503.1; ClinVar SCV000059359.5)
• PS4: >25 probands with HCM (including data from: ClinVar SCV000692503.1; ClinVar SCV000253815.4; ClinVar SCV000059359.5; SHaRe data)
• PP3: Tools predict damaging
• PM1: Variants in head region of the protein (aa 181-937) are statistically more likely to be disease-associated
• PM5: c.1207C>T (p.Arg403Trp) - Variation ID 14102 - Pathogenic by ClinGen Expert Panel
• PM2: Absent from ExAC