The nucleosome acidic patch and H2A ubiquitination underlie mSWI/SNF recruitment in synovial sarcoma.

The nucleosome acidic patch and H2A ubiquitination underlie mSWI/SNF recruitment in synovial sarcoma.
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DOI:
10.1038/s41594-020-0466-9
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发表时间:
2020-09
影响因子:
16.8
通讯作者:
Kadoch C
Kadoch C
中科院分区:
生物学1区
文献类型:
--
作者:
McBride MJ;Mashtalir N;Winter EB;Dao HT;Filipovski M;D'Avino AR;Seo HS;Umbreit NT;St Pierre R;Valencia AM;Qian K;Zullow HJ;Jaffe JD;Dhe-Paganon S;Muir TW;Kadoch C

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Interactions between chromatin-associated proteins and the histone landscape play major roles in dictating genome topology and gene expression. Cancer-specific fusion oncoproteins, which display unique chromatin localization patterns, often lack classical DNA-binding domains, presenting challenges in identifying mechanisms governing their site-specific chromatin targeting and function. Here we identify a minimal region of the human SS18-SSX fusion oncoprotein (the hallmark driver of synovial sarcoma) that mediates a direct interaction between the mSWI/SNF complex and the nucleosome acidic patch. This binding results in altered mSWI/SNF composition and nucleosome engagement, driving cancer-specific mSWI/SNF complex targeting and gene expression. Furthermore, the C-terminal region of SSX confers preferential affinity to repressed, H2AK119Ub-marked nucleosomes, underlying the selective targeting to polycomb-marked genomic regions and synovial sarcoma–specific dependency on PRC1 function. Together, our results describe a functional interplay between a key nucleosome binding hub and a histone modification that underlies the disease-specific recruitment of a major chromatin remodeling complex. A combination of cell-based and biochemical approaches reveals how oncogenic fusion protein SS18-SSX directs BAF complexes to H2AK119Ub-modified nucleosomes to remodel chromatin at cancer-specific gene targets.
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