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• W1509063235 endingPage "70" @default.
• W1509063235 startingPage "63" @default.
• W1509063235 abstract "Transcription by RNA polymerase I (pol I) regulates the rate of ribosome biogenesis and the biosynthetic potential of the cell; therefore, it plays an important role in the control of cell growth. Differentiation of the human promyelocytic leukemic cell line U937 is accompanied by drastic decreases in pol I transcriptional activity. We have used cell-free extracts prepared from undifferentiated and differentiated U937 cells to investigate the molecular mechanisms responsible for this inhibitory process. Our analysis indicates that the activity of the TATA binding protein (TBP)/TBP-associated factor (TAF) complex selectivity factor 1 (SL1), one of the factors required for accurate and promoter-specific transcription by RNA pol I, is severely repressed in differentiated U937 cells. Moreover, the reduction in SL1 activity is not a consequence of a decrease in SL1, because there is no detectable difference in the abundance of TBP or TAFs before and after U937 cell differentiation. In conclusion, our results indicate that the selectivity factor SL1 is an important target for the regulation of pol I transcription during cell differentiation." @default.
• W1509063235 created "2016-06-24" @default.
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• W1509063235 date "2000-01-01" @default.
• W1509063235 modified "2023-09-23" @default.
• W1509063235 title "Inhibition of RNA polymerase I transcription in differentiated myeloid leukemia cells by inactivation of selectivity factor 1." @default.
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• W1509063235 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10672904" @default.
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