Int. J. Mol. Sci. 2013, 14(7), 14647-14658; doi:10.3390/ijms140714647
Article

miR-29 Represses the Activities of DNA Methyltransferases and DNA Demethylases

Received: 29 May 2013; in revised form: 25 June 2013 / Accepted: 25 June 2013 / Published: 12 July 2013
(This article belongs to the Special Issue Advances in Cancer Diagnosis)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Members of the microRNA-29 (miR-29) family directly target the DNA methyltransferases, DNMT3A and DNMT3B. Disturbances in the expression levels of miR-29 have been linked to tumorigenesis and tumor aggressiveness. Members of the miR-29 family are currently thought to repress DNA methylation and suppress tumorigenesis by protecting against de novo methylation. Here, we report that members of the miR-29 family repress the activities of DNA methyltransferases and DNA demethylases, which have opposing roles in control of DNA methylation status. Members of the miR-29 family directly inhibited DNA methyltransferases and two major factors involved in DNA demethylation, namely tet methylcytosine dioxygenase 1 (TET1) and thymine DNA glycosylase (TDG). Overexpression of miR-29 upregulated the global DNA methylation level in some cancer cells and downregulated DNA methylation in other cancer cells, suggesting that miR-29 suppresses tumorigenesis by protecting against changes in the existing DNA methylation status rather than by preventing de novo methylation of DNA.
Keywords: cancer; DNA demethylation; microRNA; miR-29; TDG; TET1
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MDPI and ACS Style

Morita, S.; Horii, T.; Kimura, M.; Ochiya, T.; Tajima, S.; Hatada, I. miR-29 Represses the Activities of DNA Methyltransferases and DNA Demethylases. Int. J. Mol. Sci. 2013, 14, 14647-14658.

AMA Style

Morita S, Horii T, Kimura M, Ochiya T, Tajima S, Hatada I. miR-29 Represses the Activities of DNA Methyltransferases and DNA Demethylases. International Journal of Molecular Sciences. 2013; 14(7):14647-14658.

Chicago/Turabian Style

Morita, Sumiyo; Horii, Takuro; Kimura, Mika; Ochiya, Takahiro; Tajima, Shoji; Hatada, Izuho. 2013. "miR-29 Represses the Activities of DNA Methyltransferases and DNA Demethylases." Int. J. Mol. Sci. 14, no. 7: 14647-14658.

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