VPS39 and myotonic dystrophy type 1: Table 1 details another five splicing events found in corneal endothelial samples from patients with TNR repeat expansions that are also known to be differentially spliced in DM1 (VEGFA, VPS39, AKAP13, SOS1, and NFIX), emphasizing the similarity in cellular phenotype to a known TNR expansion disease (29, –, 32).