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Lysine-specific demethylase 2A enhances binding of various nuclear factors to CpG-rich genomic DNAs by action of its CXXC-PHD domain.

Sci Rep. 2019 Apr 02;9(1):5496
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摘要


The lysine-specific demethylase 2A gene (KDM2A) is ubiquitously expressed and its transcripts consist of several alternatively spliced forms, including KDM2A and the shorter form N782 that lacks the 3' end encoding F-box and LRR. KDM2A binds to numerous CpG-rich genomic loci and regulates various cellular activities; however, the mechanism of the pleiotropic function is unknown. Here, we identify the mechanism of KDM2A played by its CXXC-PHD domain. KDM2A is necessary for a rapid proliferation of post-natal keratinocytes while its 3' end eclipses the stimulatory effect. EGFP-N782 binds to chromatin together with the XRCC5/6 complex, and the CXXC-PHD domain regulates the CpG-rich IGFBPL1 promoter. In vitro, CXXC-PHD enhances binding of nuclear extract ORC3 to the CpG-rich promoter, but not to the AT-rich DIP2B promoter to which ORC3 binds constitutively. Furthermore, CXXC-PHD recruits 94 nuclear factors involved in replication, ribosome synthesis, and mitosis, including POLR1A to the IGFBPL1 promoter. This recruitment is unprecedented; however, the result suggests that these nuclear factors bind to their cognate loci, as substantiated by the result that CXXC-PHD recruits POLR1A to the rDNA promoter. We propose that CXXC-PHD promotes permissiveness for nuclear factors to interact, but involvement of the XRCC5/6 complex in the recruitment is undetermined.

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