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• W2000216767 abstract "Sirtuins, also designated class III histone deacetylases, are implicated in the regulation of cell division, apoptosis, DNA damage repair, genomic silencing and longevity. The nucleolar Sirtuin7 (SIRT7) was reported to be involved in the regulation of ribosomal gene (rDNA) transcription, but there are no data concerning the regulation of SIRT7 during the cell cycle. Here we have analyzed the behavior of endogenous SIRT7 during mitosis, while rDNA transcription is repressed. SIRT7 remains associated with nucleolar organizer regions, as does the RNA polymerase I machinery. SIRT7 directly interacts with the rDNA transcription factor UBF. Moreover, SIRT7 is phosphorylated via the CDK1-cyclin B pathway during mitosis and dephosphorylated by a phosphatase sensitive to okadaic acid at the exit from mitosis before onset of rDNA transcription. Interestingly, dephosphorylation events induce a conformational modification of the carboxy-terminal region of SIRT7 before the release of mitotic repression of rDNA transcription. As SIRT7 activity is required to resume rDNA transcription in telophase, we propose that this conformational modification regulates onset of rDNA transcription." @default.
• W2000216767 created "2016-06-24" @default.
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• W2000216767 date "2009-02-15" @default.
• W2000216767 modified "2023-10-16" @default.
• W2000216767 title "Involvement of SIRT7 in resumption of rDNA transcription at the exit from mitosis" @default.
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• W2000216767 doi "https://doi.org/10.1242/jcs.042382" @default.
• W2000216767 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2714433" @default.
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• W2000216767 hasPublicationYear "2009" @default.
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