CNBP and Proximal myotonic myopathy: Myotonic dystrophy type 2 (DM2; MIM#602668) is an autosomal dominant multisystemic disorder caused by a (CCTG)n repeat expansion in intron 1 of CNBP gene (previously ZNF9) on chromosome 3q21.3 (Liquori et al., 2001).