Six hESC lines were subjected to myogenic differentiation: three non-DM1 cell lines (VUB01, VUB02, VUB06) and three DM1 cell lines (VUB03-DM1, VUB19-DM1, VUB24-DM1), carrying each a differently sized CTG repeat expansion in the DMPK locus (Seriola et al., 2011; De Temmerman et al., 2008) (Table 1). This evidence concerns the gene DMPK and myotonic dystrophy type 1.