Abstract
Horizontal pleiotropy, where one variant has independent effects on multiple traits, is important for our understanding of the genetic architecture of human phenotypes. We developed a method to quantify horizontal pleiotropy using genome-wide association summary statistics and applied it to 372 heritable phenotypes measured in 361,194 UK Biobank individuals. We observed horizontal pleiotropy is: 1) pervasive throughout the human genome; 2) especially prominent among highly polygenic phenotypes; 3) detected in 24,968 variants in 7,831 loci; and 4) enriched in active regulatory regions. Our results highlight the central role horizontal pleiotropy plays in the genetic architecture of human phenotypes.
Footnotes
Fixed an error in the calculation of polygenicity-corrected pleiotropy score; added additional text discussing definitions of pleiotropy; added updated link to GitHub repository containing code and data.