Generation of a set of genetically modified long QT syndrome induced pluripotent stem cell lines carrying knock-in variants rs120074178 (KCNQ1 c.569G &gt; A; p.Arg190Gln) and rs137854600 (SCN5A c.4865G &gt; A; p.Arg1622Gln) and isogenic control lines. This evidence concerns the gene KCNQ1 and Prolonged QT interval.