For example, in myotonic dystrophy, an autosomal dominant genetic disorder, the expanded repeats ((CTG)n repeat expansion in the 3′ untranslated region of the DMPK gene for DM1 and (CCTG)n repeat expansion in intron 1 of the ZNF9 gene for DM2) are toxic as the repeats can form a stable structured RNA that aberrantly sequesters with proteins such as MBNL1 in the nucleus. The gene discussed is MBNL1; the disease is myotonic dystrophy.