rs3755863

This candidate gene association study tested 35 tagging SNPs across PPARGC1A in 2,101 Danish and Estonian children from the European Youth Heart Study, finding nominally significant associations with BMI (rs10018239, p=0.039), waist circumference (rs7656250, rs8192678, rs3755863, rs10018239; p=0.002-0.043), systolic blood pressure (rs2970869, p=0.018), aerobic fitness (rs7656250, rs13117172; p=0.002-0.008), and fasting glucose (rs7657071, rs11724368; p=0.002-0.045). However, none of these associations remained significant after correction for multiple comparisons, suggesting PPARGC1A variation has only modest effects on metabolic and cardiovascular traits in children.

This study characterized an Ashkenazi Jewish (AJ) population-specific genetic signature using genome-wide SNP data from 1,312 AJ individuals. Using ADMIXTURE and principal components analysis, the authors identified allelic patterns that differentiate AJ from European and Middle Eastern populations. Gene Ontology enrichment analysis of the AJ-specific genetic signature revealed enrichment in genes involved in transepithelial chloride transport (including CFTR with rs213950 showing V158M variant) and equilibrioception (PCDH15, CLRN1), implicating these pathways in the elevated prevalence of cystic fibrosis and Usher syndrome in Ashkenazi Jews. The study also identified disease-relevant alleles including MTHFR C677T (rs1801133), SH2B3 rs3184504 associated with type 1 diabetes/celiac disease, and MC1R rs1805005, and provided a validated set of 103 ancestry informative markers (AIMs) for population stratification correction.