MBNL1 and myotonic dystrophy type 1: We recently identified SORBS1 exon 25 as one of the most significantly differentially spliced exons (DSEs) in DM1‐affected human‐induced pluripotent stem cells (hiPSC)‐derived skeletal muscle cells, and in cells lacking MBNL isoforms 1 and 2 of MBNL (MBNL DKO) [11].