MBNL1 and myotonic dystrophy type 1: Similarly, RT-PCR analysis of MBNL1 splicing pattern across exon 7 region indicated that the ratio of MBNL1 exon 7 inclusion on total MBNL1 (MBNLex7/MBNLex7+MBNL1Δ7) is 52% in DM1, 59% DM2 and 33% in control samples.