Human leukocyte antigens in hypertrophic cardiomyopathy patients in South India

Area of Science:

• Immunogenetics
• Cardiovascular Medicine
• Human Genetics

Background:

• Hypertrophic cardiomyopathy (HCM) is a cardiac condition defined by significant ventricular hypertrophy, impaired diastolic function, and forceful ventricular contractions.
• The genetic underpinnings of HCM are complex, with a growing interest in the role of specific human leukocyte antigen (HLA) genes in its pathogenesis.

Purpose of the Study:

• To investigate the association between specific human leukocyte antigen (HLA) alleles and haplotypes and hypertrophic cardiomyopathy (HCM) in a South Indian population.
• To explore the potential role of immunogenetic factors in the development of HCM.

Main Methods:

• A case-control study was conducted involving 14 South Indian patients with hypertrophic cardiomyopathy (HCM) and left ventricular obstruction.
• Eighty-one age- and sex-matched healthy individuals from the same ethnic background served as controls.
• Human leukocyte antigen (HLA) typing for HLA-A, HLA-B, and HLA-DR loci was performed using standard serological assays, with extended incubation for DR antigens. Statistical analyses included odds ratios, frequency calculations, chi-squared tests, p-values, and haplotype frequency estimations.

Main Results:

• Significantly elevated levels of HLA-B51 and HLA-DR2 were observed in HCM patients compared to controls.
• Conversely, HLA-A19, HLA-B7, and HLA-DR4 were found at decreased frequencies in the HCM group.
• The haplotype B51-DR2-DQ3 demonstrated a significant association with hypertrophic cardiomyopathy in this South Indian cohort.

Conclusions:

• The study indicates a significant association between specific human leukocyte antigen (HLA) genes and hypertrophic cardiomyopathy (HCM) in South India.
• These findings suggest that genes within the HLA region and associated immunogenetic factors may play a crucial role in the pathogenesis of HCM.