Previously, we identified misregulation of SORBS1 exon 25 splicing in both DM1 and MBNL1/2 double‐knockout human‐induced pluripotent stem cells (hiPSC)‐derived skeletal muscle cells, suggesting a potential role in DM1 physiopathology. The gene discussed is MBNL1; the disease is myotonic dystrophy type 1.