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Hypertrophic cardiomyopathy repealing tenets in South Africa
Insights
South African hypertrophic cardiomyopathy (HCM) research identified nine causal mutations, five unique to the region, aiding genetic diagnosis. This enables precise management and prognostication for families affected by this heart condition.
Area of Science:
- Cardiology
- Genetics
- Molecular Biology
Background:
- Hypertrophic cardiomyopathy (HCM) is a prevalent cardiac disorder associated with sudden death risk.
- Genotype-phenotype correlations for HCM are not universally applicable across diverse populations.
- South African-specific data on HCM causal mutations are essential.
Purpose of the Study:
- To identify causal mutations for hypertrophic cardiomyopathy in South African subjects.
- To investigate genotype/phenotype correlations within the South African population.
- To establish DNA-based diagnostic and prognostic tools for familial HCM.
Main Methods:
- DNA-based techniques were employed to screen for mutations in South African HCM patients.
- Affected individuals and family members underwent genetic analysis, echocardiography, and electrocardiography.
- Detected mutations were traced in family members to assess carrier status and clinical presentation.
Main Results:
- Nine distinct HCM-causing mutations were identified in three genes among 24 index cases.
- Five of these mutations were unique to South Africa, with three exhibiting a founder effect.
- Mutations correlated with variable hypertrophy but were independent of sudden death risk; many carriers lacked clinical HCM diagnosis.
Conclusions:
- Rigorous diagnosis of index cases is crucial for identifying causal HCM mutations.
- DNA-based diagnosis allows for unequivocal identification of at-risk family members, irrespective of clinical status.
- This approach facilitates personalized patient management, prognostication, and genetic counseling, offering significant time and cost savings.
Abstract:
Hypertrophic cardiomyopathy (HCM), a common primary cardiac disorder with an increased risk of sudden death, affects all population groups in South Africa. Distinct causal mutations in multiple sarcomeric protein-encoding genes correlate with the risk of sudden death. Such genotype/phenotype correlations cannot be extrapolated geographically or ethnically, necessitating the generation of South African-specific data. We used DNA-based techniques to search for the causal mutations in a panel of South African HCM-affected subjects (37 with unequivocal HCM, 47 with HCM-like disease). Mutations detected were traced in family members and carriers assessed by echocardiography and electrocardiography. Nine different HCM-causing mutations (5 unique to South Africa, 3 showing a founder effect) were identified in 3 genes in 24 index cases (57% HCM group, 6% HCM-like group). The different mutations were associated with variable hypertrophy, independent of the risk of sudden death. The disease was generally familial and many at-risk mutation carriers did not meet clinical diagnostic criteria for HCM. Rigorous diagnosis of index cases facilitates detection of causal mutations, which allows for unequivocal DNA-based diagnosis of at-risk family members, regardless of age or clinical status. This permits focused patient management, informed prognostication and realistic counselling for this insidious disease, as well as time and cost savings.
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