Abstract
The Ets transcription factor PU.1 is a hematopoietic master regulator essential for the development of myeloid and B-cell lineages. As we previously reported, PU.1 sometimes represses transcription on forming a complex with mSin3A–histone deacetyl transferase–MeCP2. Here, we show an interaction between PU.1 and DNA methyltransferases, DNA methyltransferase (Dnmt)3a and Dnmt3b (Dnmt3s). Glutathione-S-transferase pulldown assay revealed that PU.1 directly interacted with the ATRX domain of Dnmt3s through the ETS domain. Dnmt3s repressed the transcriptional activity of PU.1 on a reporter construct with trimerized PU.1-binding sites. The repression was recovered by addition of 5-aza-deoxycitidine, a DNA methyltransferase inhibitor, but not trichostatin A, a histone deacetylase inhibitor. Bisulfite sequence analysis revealed that several CpG sites in the promoter region neighboring the PU.1-binding sites were methylated when Dnmt3s were coexpressed with PU.1. We also showed that the CpG sites in the p16INK4A promoter were methylated by overexpression of PU.1 in NIH3T3 cells, accompanied by a downregulation of p16INK4A gene expression. These results suggest that PU.1 may downregulate its target genes through an epigenetic modification such as DNA methylation.
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Abbreviations
- GST:
-
glutathione-S-transferase
- G418:
-
geneticin
- Tris:
-
2-amino-2-hydroxymethyl-1,3-propanediol
- DMEM:
-
Dulbecco's modified Eagle's minimum essential medium
- HEPES:
-
2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid
- MOPS:
-
3-morpholinopropanesulfonic acid
- PVDF:
-
polyvinylidene fluoride
- PMSF:
-
phenylmethylsulfonyl fluoride
- EDTA:
-
ethylenediamine-N, N, N′, N′-tetraacetic acid
- SDS:
-
sodium dodecylsulfate
- DOC:
-
sodium deoxycholate
- NP-40:
-
Nodiet P-40
- 5-AZAdC:
-
5-aza-deoxycitidine
- TSA:
-
trichostatin A
- HDAC:
-
histone deacetyl transferase
- CBP:
-
CRE-binding protein
- Dnmt:
-
DNA methyltransferase
- GAPDH:
-
glyceraldehyde-3-phosphate dehydrogenase
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Acknowledgements
We wish to thank Dr I Kitabayashi, National Cancer Center, Tokyo, Japan, for expression plasmids of mSin3A and HDAC1, and Dr C Jones, The Salk Institute, La Jolla CA, USA, for pTK-100-Luc reporter plasmid. We also thank Dr N Kondoh, National Defense Medical College, Saitama, Japan, for the helpful advice with respect to bisulfite sequencing analysis. This work was mainly supported by a Grant-in-Aid for Encouragement of Young Scientist (to MS) from the Ministry of Education, Science and Culture of Japan, and a Grant from the Nishi Foundation, Tokyo, Japan. Financial support for TO from Dr J Akiyama, OBGYN Akiyama Memorial Hospital, Hakodate, Dr K Watanabe, Watanabe Clinic, Shizuoka and Dr S Kurakata, Sankyo Ltd, Tokyo, Japan is also acknowledged.
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Suzuki, M., Yamada, T., Kihara-Negishi, F. et al. Site-specific DNA methylation by a complex of PU.1 and Dnmt3a/b. Oncogene 25, 2477–2488 (2006). https://doi.org/10.1038/sj.onc.1209272
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DOI: https://doi.org/10.1038/sj.onc.1209272
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