“By not accounting for shared environmental factors, scientists may overestimate the importance of genetic variation by an average of 47 per cent, the study found.”
María Muñoz, Ricardo Pong-Wong, Oriol Canela-Xandri, Konrad Rawlik, Chris S Haley, Albert Tenesa. Evaluating the contribution of genetics and familial shared environment to common disease using the UK Biobank. Nature Genetics, 2016; DOI: 10.1038/ng.3618