MBNL1 and myotonic dystrophy type 1: The breadth of splicing dysregulation within the DM1 cohort is further demonstrated via visualization of select disease-specific events, including CLCN1 exon 7a (e7a), CACNA1S e29, INSR e11, ATP2A1 e22, and MBNL1 e5 (Figure 1D) (14–18, 20, 37–39).