Effect of the [CCTG]n repeat expansion on ZNF9 expression in myotonic dystrophy type II (DM2) |
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Authors: | Botta Annalisa Caldarola Sara Vallo Laura Bonifazi Emanuela Fruci Doriana Gullotta Francesca Massa Roberto Novelli Giuseppe Loreni Fabrizio |
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Institution: | Department of Biopathology, Tor Vergata University, Rome, Italy. |
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Abstract: | Myotonic dystrophy is caused by two different mutations: a (CTG)n expansion in 3' UTR region of the DMPK gene (DM1) and a (CCTG)n expansion in intron 1 of the ZNF9 gene (DM2). The most accredited mechanism for DM pathogenesis is an RNA gain-of-function. Other findings suggest a contributory role of DMPK-insufficiency in DM1. To address the issue of ZNF9 role in DM2, we have analyzed the effects of (CCTG)n expansion on ZNF9 expression in lymphoblastoid cell lines (n=4) from DM2 patients. We did not observe any significant alteration in ZNF9 mRNA and protein levels, as shown by QRT-PCR and Western blot analyses. Additional RT-PCR experiments demonstrated that ZNF9 pre-mRNA splicing pattern, which includes two isoforms, is unmodified in DM2 cells. Our results indicate that the (CCTG)n expansion in the ZNF9 intron does not appear to have a direct consequence on the expression of the gene itself. |
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