Left ventricular structure and function in relation to steroid biosynthesis genes in a white population

Area of Science:

• Cardiology
• Genetics
• Biochemistry

Background:

• Endogenous ouabain (EO) and aldosterone are steroid hormones implicated in left ventricular (LV) hypertrophy and cardiac remodeling.
• Cholesterol side-chain cleavage enzyme (CYP11A1) and 3β-hydroxysteroid dehydrogenase (HSD3B1) are critical enzymes in steroid biosynthesis.

Purpose of the Study:

• To investigate the association between genetic variations in CYP11A1 and HSD3B1 and LV structure and function.
• To explore the relationship between specific single nucleotide polymorphisms (SNPs) and haplotypes of these genes and cardiac parameters.

Main Methods:

• Echocardiography and Doppler imaging were used to assess LV structure and diastolic function in 532 individuals.
• Genotyping was performed for tag SNPs in CYP11A1 (rs2279357, rs11638442, rs2073475) and HSD3B1 (rs2236780, rs3765945, rs6203).
• Statistical analyses accounted for covariables and family clusters.

Main Results:

• Decreased LV mass index was observed across different genotypes of CYP11A1 (rs2279357, rs11638442, rs2073475).
• Carriers of the CYP11A1 TCG haplotype exhibited lower LV mass and LV mass index.
• Carriers of the HSD3B1 GCC haplotype showed altered mitral annular velocities, resulting in a lower Ea/Aa ratio, indicative of impaired diastolic function.

Conclusions:

• LV mass and diastolic function appear to be associated with genetic variations in steroid biosynthesis enzymes.
• Further studies are needed to confirm these findings in diverse populations.