TOP2 synergizes with BAF chromatin remodeling for both resolution and formation of facultative heterochromatin.
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Abstract | The resolution and formation of facultative heterochromatin are essential for development, reprogramming, and oncogenesis. The mechanisms underlying these changes are poorly understood owing to the difficulty of studying heterochromatin dynamics and structure in vivo. We devised an in vivo approach to investigate these mechanisms and found that topoisomerase II (TOP2), but not TOP1, synergizes with BAF (mSWI/SNF) ATP-dependent chromatin remodeling complexes genome-wide to resolve facultative heterochromatin to accessible chromatin independent of transcription. This indicates that changes in DNA topology that take place through (de-)catenation rather than the release of torsional stress through swiveling are necessary for heterochromatin resolution. TOP2 and BAF cooperate to recruit pluripotency factors, which explains some of the instructive roles of BAF complexes. Unexpectedly, we found that TOP2 also plays a role in the re-formation of facultative heterochromatin; this finding suggests that facultative heterochromatin and accessible chromatin exist at different states of catenation or other topologies, which might be critical to their structures. |
Year of Publication | 2017
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Journal | Nat Struct Mol Biol
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Volume | 24
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Issue | 4
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Pages | 344-352
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Date Published | 2017 Apr
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ISSN | 1545-9985
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DOI | 10.1038/nsmb.3384
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PubMed ID | 28250416
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PubMed Central ID | PMC5395302
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Grant list | K99 CA184043 / CA / NCI NIH HHS / United States
R01 NS046789 / NS / NINDS NIH HHS / United States
R37 NS046789 / NS / NINDS NIH HHS / United States
K99 CA187565 / CA / NCI NIH HHS / United States
R01 CA163915 / CA / NCI NIH HHS / United States
T32 GM007790 / GM / NIGMS NIH HHS / United States
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