Abstract
Despite important roles in mammalian gene regulation, the critical targeting mechanism of DNA methylation for specific DNA sequences remains unclear. Recently, small non-coding RNAs were reported to be essential for DNA methylation in plants as well as in mice, suggesting that small non-coding RNAs might interact with DNA methyltransferases (DNMTs) to provide them with target sequence information. In the present study, we attempted to detect and isolate microRNAs by immunoprecipitation (IP) that might be associated with human DNMT3a. When analyzed by gel electrophoresis after radioisotope-labeling, DNMT3a IP revealed no detectable levels of microRNA. RNA from DNMT3a IP was also analyzed with microRNA microarray and with subsequent RT-PCR. The results showed no specific enrichment of candidate microRNAs in the DNMT3a IP. DNMT3a was not directly associated with microRNAs. But, other classes of small non-coding RNA could still be implicated with DNMTs in a specific tissue such as testis where such RNA species are highly abundant.
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs12265-010-9167-9/MediaObjects/12265_2010_9167_Fig1_HTML.gif)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs12265-010-9167-9/MediaObjects/12265_2010_9167_Fig2_HTML.gif)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs12265-010-9167-9/MediaObjects/12265_2010_9167_Fig3_HTML.gif)
Similar content being viewed by others
References
Aravin, A. A., Sachidanandam, R., Girard, A., Fejes-Toth, K., & Hannon, G. J. (2007). Developmentally regulated piRNA clusters implicate MILI in transposon control. Science, 316, 744–747.
Bird, A. (2007). Perceptions of epigenetics. Nature, 447, 396–398.
Chen, C., Ridzon, D. A., Broomer, A. J., et al. (2005). Real-time quantification of microRNAs by stem-loop RT-PCR. Nucleic Acids Research, 33, e179.
Edwards, C. A., & Ferguson-Smith, A. C. (2007). Mechanisms regulating imprinted genes in clusters. Current Opinion in Cell Biology, 19, 281–289.
Esteller, M. (2007). Epigenetic gene silencing in cancer: the DNA hypermethylome. Human Molecular Genetics, 16, R50–R59.
Futscher, B. W., Oshiro, M. M., Wozniak, R. J., et al. (2002). Role for DNA methylation in the control of cell type specific maspin expression. Nature Genetics, 31, 175–179.
Girard, A., Sachidanandam, R., Hannon, G. J., & Carmell, M. A. (2006). A germline-specific class of small RNAs binds mammalian Piwi proteins. Nature, 442, 199–202.
Heard, E., Clerc, P., & Avner, P. (1997). X-chromosome inactivation in mammals. Annual Review of Genetics, 31, 571–610.
Hutvágner, G., & Zamore, P. D. (2002). A microRNA in a multiple-turnover RNAi enzyme complex. Science, 297, 2056–2060.
Hwang, H. W., Wentzel, E. A., & Mendell, J. T. (2007). A hexanucleotide element directs microRNA nuclear import. Science, 315, 97–100.
Jeffery, L., & Nakielny, S. (2004). Components of the DNA methylation system of chromatin control are RNA-binding proteins. Journal of Biological Chemistry, 279, 49479–49487.
Kawasaki, H., & Taira, K. (2006). Retraction: induction of DNA methylation and gene silencing by short interfering RNAs in human cells. Nature, 441, 1176.
Kim, G. D., Ni, J., Kelesoglu, N., Roberts, R. J., & Pradhan, S. (2002). Co-operation and communication between the human maintenance and de novo DNA (cytosine-5) methyltransferases. EMBO Journal, 21, 4183–4195.
Klose, R. J., & Bird, A. P. (2006). Genomic DNA methylation: the mark and its mediators. Trends in Biochemical Sciences, 31, 89–97.
Kuramochi-Miyagawa, S., Watanabe, T., Gotoh, K., et al. (2008). DNA methylation of retrotransposon genes is regulated by Piwi family members MILI and MIWI2 in murine fetal testes. Genes and Development, 22, 908–917.
Laemmli, U. K. (1970). Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature, 227, 680–685.
Lagos-Quintana, M., Rauhut, R., Lendeckel, W., & Tuschl, T. (2001). Identification of novel genes coding for small expressed RNAs. Science, 294, 853–858.
Lagos-Quintana, M., Rauhut, R., Meyer, J., Borkhardt, A., & Tuschl, T. (2003). New microRNAs from mouse and human. RNA, 9, 175–179.
Lee, R. C., Feinbaum, R. L., & Ambros, V. (1993). The C. elegans heterochronic gene lin-4 encodes small RNAs with antisense complementarity to lin-14. Cell, 75, 843–854.
Lee, Y., Ahn, C., Han, J., Choi, H., Kim, J., Yim, J., et al. (2003). The nuclear RNase III Drosha initiates microRNA processing. Nature, 425, 415–419.
Li, E., Bestor, T. H., & Jaenisch, R. (1992). Targeted mutation of the DNA methyltransferase gene results in embryonic lethality. Cell, 69, 915–926.
Lund, E., Guttinger, S., Calado, A., Dahlberg, J. E., & Kutay, U. (2004). Nuclear export of microRNA precursors. Science, 303, 95–98.
Margot, J. B., Cardoso, M. C., & Leonhardt, H. (2001). Mammalian DNA methyltransferases show different subnuclear distributions. Journal of Cellular Biochemistry, 83, 373–379.
Margot, J. B., Ehrenhofer-Murray, A. E., & Leonhardt, H. (2003). Interactions within the mammalian DNA methyltransferase family. BMC Molecular Biology, 4, 7.
Matzke, M., Kanno, T., Huettel, B., Daxinger, L., & Matzke, A. J. (2007). Targets of RNA-directed DNA methylation. Current Opinion in Plant Biology, 10, 512–519.
Morris, K. V., Chan, S. W., Jacobsen, S. E., & Looney, D. J. (2004). Small interfering RNA-induced transcriptional gene silencing in human cells. Science, 305, 1289–1292.
Mourelatos, Z., Dostie, J., Paushkin, S., Sharma, A., Charroux, B., Abel, L., et al. (2002). miRNPs: a novel class of ribonucleoproteins containing numerous microRNAs. Genes and Development, 16, 720–728.
Murchison, E. P., Partridge, J. F., Tam, O. H., Cheloufi, S., & Hannon, G. J. (2005). Characterization of Dicer-deficient murine embryonic stem cells. Proceedings of the National Academy of Sciences of the United States of America, 102, 12135–12140.
Okano, M., Bell, D. W., Haber, D. A., & Li, E. (1999). DNA methyltransferases Dnmt3a and Dnmt3b are essential for de novo methylation and mammalian development. Cell, 99, 247–257.
Park, C. W., Chen, Z., Kren, B. T., & Steer, C. J. (2004). Double-stranded siRNA targeted to the huntingtin gene does not induce DNA methylation. Biochemical and Biophysical Research Communications, 323, 275–280.
Sakai, T., Toguchida, J., Ohtani, N., Yandell, D. W., Rapaport, J. M., & Dryja, T. P. (1991). Allele-specific hypermethylation of the retinoblastoma tumor-suppressor gene. American Journal of Human Genetics, 48, 880–888.
Suetake, I., Shinozaki, F., Miyagawa, J., Takeshima, H., & Tajima, S. (2004). DNMT3L stimulates the DNA methylation activity of Dnmt3a and Dnmt3b through a direct interaction. Journal of Biological Chemistry, 279, 27816–27823.
Thomson, J. M., Parker, J., Perou, C. M., & Hammond, S. M. (2004). A custom microarray platform for analysis of microRNA gene expression. Nature Methods, 1, 47–53.
Ting, A. H., Schuebel, K. E., Herman, J. G., & Baylin, S. B. (2005). Short double-stranded RNA induces transcriptional gene silencing in human cancer cells in the absence of DNA methylation. Nature Genetics, 37, 906–910.
Yekta, S., Shih, I. H., & Bartel, D. P. (2004). MicroRNA-directed cleavage of HOXB8 mRNA. Science, 304, 594–596.
Zeng, Y., & Cullen, B. R. (2003). Sequence requirements for micro RNA processing and function in human cells. RNA, 9, 112–123.
Zhu, H., Geiman, T. M., Xi, S., Jiang, Q., Schmidtmann, A., Chen, T., et al. (2006). Lsh is involved in de novo methylation of DNA. EMBO Journal, 25, 335–345.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Park, C.W., Zeng, Y. & Steer, C.J. Human DNA Methyltransferase 3a does not Associate with MicroRNAs in the Regulation of DNA Methylation. J. of Cardiovasc. Trans. Res. 3, 290–295 (2010). https://doi.org/10.1007/s12265-010-9167-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12265-010-9167-9