Primary hypertrophic cardiomyopathy (HCM) is predominantly a genetic disease causing left ventricular hypertrophy in the absence of other cardiac and systemic metabolic diseases. Currently, limited da Show more
Primary hypertrophic cardiomyopathy (HCM) is predominantly a genetic disease causing left ventricular hypertrophy in the absence of other cardiac and systemic metabolic diseases. Currently, limited data exist on the prevalence of clinically actionable gene variants for primary HCM in South Asian Indian (SAI) patients, which are necessary for minimizing disparities in interpreting ancestry-specific variants. The ClinGen Hereditary Cardiovascular Disorders Gene Curation Expert Panel categorized HCM-causing genes into 5 categories according to their clinical relevance: definitive, strong, moderate, limited, and disputed. However, comprehensive studies examining this classification in SAI patients are lacking. Whole-exome sequencing was performed for 335 primary SAI patients with HCM, including all known cardiovascular genes and clinically actionable gene categories to determine their allele frequencies. SAI HCM exomes revealed a total of 193 pathogenic/likely pathogenic variants and variants of uncertain significance across 26 clinically actionable genes in 119 (35.52%) of 335 cases. The SAI HCM exhibited significantly fewer variants in the 12 definitive category genes compared with other global HCM cohorts (15.77% versus 43.23%; The clinically actionable gene variants in SAI HCM differed significantly from other global HCM cohorts, specifically Show less
Mutations in Myosin Binding Protein C ( We carried out targeted direct sequencing of We detected 34 single nucleotide variations in The present comprehensive study on
Heart failure is a leading cause of mortality in South Asians. However, its genetic etiology remains largely unknown. Cardiomyopathies due to sarcomeric mutations are a major monogenic cause for heart Show more
Heart failure is a leading cause of mortality in South Asians. However, its genetic etiology remains largely unknown. Cardiomyopathies due to sarcomeric mutations are a major monogenic cause for heart failure (MIM600958). Here, we describe a deletion of 25 bp in the gene encoding cardiac myosin binding protein C (MYBPC3) that is associated with heritable cardiomyopathies and an increased risk of heart failure in Indian populations (initial study OR = 5.3 (95% CI = 2.3-13), P = 2 x 10(-6); replication study OR = 8.59 (3.19-25.05), P = 3 x 10(-8); combined OR = 6.99 (3.68-13.57), P = 4 x 10(-11)) and that disrupts cardiomyocyte structure in vitro. Its prevalence was found to be high (approximately 4%) in populations of Indian subcontinental ancestry. The finding of a common risk factor implicated in South Asian subjects with cardiomyopathy will help in identifying and counseling individuals predisposed to cardiac diseases in this region. Show less