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2017 ; 45
(6
): 3102-3115
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Non-CpG methylation by DNMT3B facilitates REST binding and gene silencing in
developing mouse hearts
#MMPMID27956497
Zhang D
; Wu B
; Wang P
; Wang Y
; Lu P
; Nechiporuk T
; Floss T
; Greally JM
; Zheng D
; Zhou B
Nucleic Acids Res
2017[Apr]; 45
(6
): 3102-3115
PMID27956497
show ga
The dynamic interaction of DNA methylation and transcription factor binding in
regulating spatiotemporal gene expression is essential for embryogenesis, but the
underlying mechanisms remain understudied. In this study, using mouse models and
integration of in vitro and in vivo genetic and epigenetic analyses, we show that
the binding of REST (repressor element 1 (RE1) silencing transcription factor;
also known as NRSF) to its cognate RE1 sequences is temporally regulated by
non-CpG methylation. This process is dependent on DNA methyltransferase 3B
(DNMT3B) and leads to suppression of adult cardiac genes in developing hearts. We
demonstrate that DNMT3B preferentially mediates non-CpG methylation of
REST-targeted genes in the developing heart. Downregulation of DNMT3B results in
decreased non-CpG methylation of RE1 sequences, reduced REST occupancy, and
consequently release of the transcription suppression during later cardiac
development. Together, these findings reveal a critical gene silencing mechanism
in developing mammalian hearts that is regulated by the dynamic interaction of
DNMT3B-mediated non-CpG methylation and REST binding.