Gene-echocardiography: refining genotype-phenotype correlations in hypertrophic cardiomyopathy

Area of Science:

• Cardiovascular Genetics
• Molecular Cardiology
• Medical Diagnostics

Background:

• Hypertrophic cardiomyopathy (HCM) is a primary genetic heart disease.
• Understanding genotype-phenotype correlations is crucial for personalized medicine in HCM.
• Existing research highlights genetic underpinnings but requires further elucidation of specific hypertrophic patterns.

Purpose of the Study:

• To investigate the association between distinct hypertrophic patterns and specific genetic variants in hypertrophic cardiomyopathy (HCM).
• To establish a foundation for advancing personalized management strategies through a "gene-echocardiography" approach.
• To enhance the precision and efficiency of genetic counseling and testing in HCM.

Main Methods:

• Whole Exome Sequencing (WES) was performed on 392 HCM-affected families.
• Echocardiographic data were collected and analyzed in conjunction with genetic findings.
• Correlation analysis was conducted to link specific gene mutations with observed hypertrophic patterns.

Main Results:

• HCM patients with gene mutations showed increased septal and interventricular septal thickness compared to those without.
• Mid-septal hypertrophy correlated with myosin binding protein C3 (MYBPC3) variants.
• Apical hypertrophy was linked to alpha kinase 3 (ALPK3) mutations, while titin (TTN) and obscurin (OBSCN) mutations showed uniform distribution.
• Specific hypertrophic patterns were associated with myosin heavy chain 7 (MYH7), troponin I3 (TNNI3), tropomyosin 1 (TPM1), and troponin T2 (TNNT2) variants.

Conclusions:

• A strong correlation exists between hypertrophic patterns and genetic variants in HCM.
• The identified
• gene-echocardiography
• concept offers valuable diagnostic insights.
• Findings support enhanced genetic testing and personalized management for HCM patients.