RSPH6A and myotonic dystrophy type 1: The use of single nucleotide polymorphism (SNP) information for the assessment of total and allelic expression of a region that covers > 150 kbp around the DM1 repeat revealed that the expression of FBX046, BHMG1, SIX5, DMPK, DMWD, RSPH6A, and SYMPK was not significantly different in myoblasts with and without the (CTG)2600 repeat (Figure 2A).