Abstract:
:SWI/SNF (switch/sucrose nonfermenting) complexes regulate transcription through chromatin remodeling and opposing gene silencing by Polycomb group (PcG) proteins. Genes encoding SWI/SNF components are critical for normal development and frequently mutated in human cancer. We characterized the in vivo contributions of SWI/SNF and PcG complexes to proliferation-differentiation decisions, making use of the reproducible development of the nematode Caenorhabditis elegans. RNA interference, lineage-specific gene knockout, and targeted degradation of SWI/SNF BAF components induced either overproliferation or acute proliferation arrest of precursor cells, depending on residual protein levels. Our data show that a high SWI/SNF BAF dosage is needed to arrest cell division during differentiation and to oppose PcG-mediated repression. In contrast, a low SWI/SNF protein level is necessary to sustain cell proliferation and hyperplasia, even when PcG repression is blocked. These observations show that incomplete inactivation of SWI/SNF components can eliminate a tumor-suppressor activity while maintaining an essential transcription regulatory function.
journal_name
Sci Advjournal_title
Science advancesauthors
van der Vaart A,Godfrey M,Portegijs V,van den Heuvel Sdoi
10.1126/sciadv.aay3823subject
Has Abstractpub_date
2020-05-20 00:00:00pages
eaay3823issue
21issn
2375-2548pii
aay3823journal_volume
6pub_type
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