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- W2110035824 abstract "Mammalian SWI/SNF-related complexes are ATPase-powered nucleosome remodeling assemblies crucial for proper development and tissue-specific gene expression. The ATPase activity of the complexes is also critical for tumor suppression. The complexes contain seven or more noncatalytic subunits; only one of which, hSNF5/Ini1/BAF47, has been individually identified as a tumor suppressor thus far. The noncatalytic subunits include p270/ARID1A, which is of particular interest because tissue array analysis corroborated by screening of tumor cell lines indicates that p270 may be deficient in as many as 30% of renal carcinomas and 10% of breast carcinomas. The complexes can also include an alternative ARID1B subunit, which is closely related to p270, but the product of an independent gene. The respective importance of p270 and ARID1B in the control of cell proliferation was explored here using a short interfering RNA approach and a cell system that permits analysis of differentiation-associated cell cycle arrest. The p270-depleted cells fail to undergo normal cell cycle arrest on induction, as evidenced by continued synthesis of DNA. These lines fail to show other characteristics typical of arrested cells, including up-regulation of p21 and down-regulation of cyclins. The requirement for p270 is evident separately in both the up-regulation of p21 and the down-regulation of E2F-responsive products. In contrast, the ARID1B-depleted lines behaved like the parental cells in these assays. Thus, p270-containing complexes are functionally distinct from ARID1B-containing complexes. These results provide a direct biological basis to support the implication from tumor tissue screens that deficiency of p270 plays a causative role in carcinogenesis." @default.
- W2110035824 created "2016-06-24" @default.
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- W2110035824 date "2005-10-15" @default.
- W2110035824 modified "2023-09-30" @default.
- W2110035824 title "The p270 (<i>ARID1A/SMARCF1</i>) Subunit of Mammalian SWI/SNF-Related Complexes Is Essential for Normal Cell Cycle Arrest" @default.
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- W2110035824 doi "https://doi.org/10.1158/0008-5472.can-05-1225" @default.
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