ABLIM1 splicing is abnormal in skeletal muscle of patients with DM 1 and regulated by MBNL , CELF and PTBP 1

• Published in: Genes to cells : devoted to molecular & cellular mechanisms 2015-02, Vol.20 (2), p.121-134
• Main Authors: Ohsawa, Natsumi, Koebis, Michinori, Mitsuhashi, Hiroaki, Nishino, Ichizo, Ishiura, Shoichi
• Format: Article
• Language: English
• ISSN: 1356-9597; 1365-2443
• DOI: 10.1111/gtc.12201

Myotonic dystrophy type 1 ( DM 1) is an RNA ‐mediated disorder characterized by muscle weakness, cardiac defects and multiple symptoms and is caused by expanded CTG repeats within the 3′ untranslated region of the DMPK gene. In this study, we found abnormal splicing of actin‐binding LIM protein 1 ( ABLIM1 ) in skeletal muscles of patients with DM 1 and a DM 1 mouse model ( HSA LR ). An exon 11 inclusion isoform is expressed in skeletal muscle and heart of non‐ DM 1 individuals, but not in skeletal muscle of patients with DM 1 or other adult human tissues. Moreover, we determined that ABLIM1 splicing is regulated by several splice factors, including MBNL family proteins, CELF 1, 2 and 6, and PTBP 1, using a cellular splicing assay. MBNL proteins promoted the inclusion of ABLIM1 exon 11, but other proteins and expanded CUG repeats repressed exon 11 of ABLIM1 . This result is consistent with the hypothesis that MBNL proteins are trapped by expanded CUG repeats and inactivated in DM 1 and that CELF 1 is activated in DM 1. However, activation of PTBP 1 has not been reported in DM 1. Our results suggest that the exon 11 inclusion isoform of ABLIM1 may have a muscle‐specific function, and its abnormal splicing could be related to muscle symptoms of DM 1.