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DNMT3L interacts with transcription factors to target DNMT3L/DNMT3B to specific DNA sequences: role of the DNMT3L/DNMT3B/p65-NFκB complex in the (de-)methylation of TRAF1.

Biochimie. 2014 Sep;104:36-49. Epub 2014 Jun 18
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摘要


DNMT3L i.e. DNA (cytosine-5)-methyltransferase 3-like protein, is devoid of cytosine methyltransferase activity, despite clear homology to DNMT3A and DNMT3B, due to the mutation of key catalytic residues. However, DNMT3L participates in de novo methylation reactions through its direct interaction with DNMT3A and DNMT3B. In the present study, we investigated if DNMT3L interacts also directly with transcription factors (TFs). Using TF arrays, we identified 73 TFs that interacted with DNMT3L, 13 of which (ASH2L, ATF1, ATF3, BLZF1, CDX2, CERM, E2F3, E2F4, GCNF, GTF2I, GTF3C5, NFkB-p65 and RXRα) interacted only with DNMT3L, but not with DNMT3A/B. By focusing on the interaction with NFkB-p65, we demonstrate that DNMT3L forms a complex with DNMT3B and NFkB-p65 and that this complex is required for the control of DNA methylation at the TRAF1 promoter in the T98G glioma cell line. In addition, our experiments describe the DNA methylation at TRAF1 as being dynamic with a demethylation phase involving TET3. Thus, our data suggests that DNMT3L can address DNMT3A/B to specific sites by directly interacting with TFs that do not directly interact with DNMT3A/B. In summary, our data provide a new avenue for the direction of site-specific de novo DNA methylation catalyzed by DNMT3A/B.

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