Journal
NATURE GENETICS
Volume 52, Issue 12, Pages 1271-1281Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41588-020-00736-4
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Funding
- National Cancer Institute through Outstanding Investigator Award [R35CA197569]
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Recent progress relating to the catalytic and non-catalytic functions of histone modifying complexes warrants a fresh look at the role of histone modifications and the histone code model. Histone-modifying enzymes are implicated in the control of diverse DNA-templated processes including gene expression. Here, we outline historical and current thinking regarding the functions of histone modifications and their associated enzymes. One current viewpoint, based largely on correlative evidence, posits that histone modifications are instructive for transcriptional regulation and represent an epigenetic 'code'. Recent studies have challenged this model and suggest that histone marks previously associated with active genes do not directly cause transcriptional activation. Additionally, many histone-modifying proteins possess non-catalytic functions that overshadow their enzymatic activities. Given that much remains unknown regarding the functions of these proteins, the field should be cautious in interpreting loss-of-function phenotypes and must consider both cellular and developmental context. In this Perspective, we focus on recent progress relating to the catalytic and non-catalytic functions of the Trithorax-COMPASS complexes, Polycomb repressive complexes and Clr4/Suv39 histone-modifying machineries.
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