Key result
The MYH7 A797T mutation was associated with a 61% disease penetrance for hypertrophic cardiomyopathy and generally a favorable prognosis, though survival was significantly worse in one specific pedigree (p=0.024).
Why the study?
What is the phenotypic expression and prognosis associated with the South African founder MYH7 A797T mutation in hypertrophic cardiomyopathy?
What is the phenotypic expression and prognosis associated with the South African founder MYH7 A797T mutation in hypertrophic cardiomyopathy?
The MYH7 A797T founder mutation in South African HCM patients generally confers a benign prognosis despite significant hypertrophy, highlighting the role of genetic and environmental modifiers in disease expression.
Supports favorable prognosis counseling for this founder mutation; extends modifier data in HCM but leaves pedigree risks open.
Genotype-phenotype correlations provide another perspective in studies seeking to identify the factors that underlie the clinical variability that is a feature of several inherited diseases. This approach has been particularly revealing in investigations into the molecular causes and phenotypic heterogeneity associated with hypertrophic cardiomyopathy (HCM), a common inherited primary cardiac disorder.1 2 Although, as its name suggests, hypertrophy may be a noticeable feature of the disease, it is not invariant, nor does the degree of hypertrophy necessarily correlate with the risk of sudden cardiac death (SCD), which is the most feared consequence of HCM.
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Johanna C. Moolman‐Smook (2000) conducted a letter in Hypertrophic cardiomyopathy (n=69). MYH7 A797T mutation vs. Unexposed relatives / TNNT2 R92W mutation carriers was evaluated on Disease penetrance and survival. The MYH7 A797T mutation was associated with a 61% disease penetrance for hypertrophic cardiomyopathy and generally a favorable prognosis, though survival was significantly worse in one specific pedigree (p=0.024).
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