Valine codon 103 (GTC) in exon 1 was changed to isoleucine (ATC) (p.V103I) using an sgRNA (CCGUAUCCGUACUGUUUAAC) and an ssODN template with CRISPR/Cas9 technology. This mutation mimics the same human variant associated with protection against obesity and increased adiposity in people of European descent. (J:305517)