Involvement of human ORC and TRF2 in pre-replication complex assembly at telomeres

Yasutoshi Tatsumi, Kai Ezura, Kazumasa Yoshida, Takashi Yugawa, Mako Narisawa-Saito, Tohru Kiyono, Satoshi Ohta, Chikashi Obuse, Masatoshi Fujita

研究成果: ジャーナルへの寄稿記事

32 引用 (Scopus)

抄録

The origin recognition complex (ORC) binds to replication origins to regulate the cell cycle-dependent assembly of pre-replication complexes (pre-RCs). We have found a novel link between pre-RC assembly regulation and telomere homeostasis in human cells. Biochemical analyses showed that human ORC binds to TRF2, a telomere sequence-binding protein that protects telomeres and functions in telomere length homeostasis, via the ORC1 subunit. Immunostaining further revealed that ORC and TRF2 partially co-localize in nuclei, whereas chromatin immuno- precipitation analyses confirmed that pre-RCs are assembled at telomeres in a cell cycle-dependent manner. Over-expression of TRF2 stimulated ORC and MCM binding to chromatin and RNAi-directed TRF2 silencing resulted in reduced ORC binding and pre-RC assembly at telomeres. As expected from previous reports, TRF2 silencing induced telomere elongation. Interestingly, ORC1 silencing by RNAi weakened the TRF2 binding as well as the pre-RC assembly at telomeres, suggesting that ORC and TRF2 interact with each other to achieve stable binding. Furthermore, ORC1 silencing also resulted in modest telomere elongation. These data suggest that ORC might be involved in telomere homeostasis in human cells.

元の言語英語
ページ(範囲)1045-1059
ページ数15
ジャーナルGenes to Cells
13
発行部数10
DOI
出版物ステータス出版済み - 12 1 2008
外部発表Yes

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Origin Recognition Complex
Telomere
Telomere Homeostasis
RNA Interference
Chromatin
Cell Cycle
Telomere-Binding Proteins
Replication Origin

All Science Journal Classification (ASJC) codes

  • Genetics
  • Cell Biology

これを引用

Involvement of human ORC and TRF2 in pre-replication complex assembly at telomeres. / Tatsumi, Yasutoshi; Ezura, Kai; Yoshida, Kazumasa; Yugawa, Takashi; Narisawa-Saito, Mako; Kiyono, Tohru; Ohta, Satoshi; Obuse, Chikashi; Fujita, Masatoshi.

:: Genes to Cells, 巻 13, 番号 10, 01.12.2008, p. 1045-1059.

研究成果: ジャーナルへの寄稿記事

Tatsumi, Y, Ezura, K, Yoshida, K, Yugawa, T, Narisawa-Saito, M, Kiyono, T, Ohta, S, Obuse, C & Fujita, M 2008, 'Involvement of human ORC and TRF2 in pre-replication complex assembly at telomeres', Genes to Cells, 巻. 13, 番号 10, pp. 1045-1059. https://doi.org/10.1111/j.1365-2443.2008.01224.x
Tatsumi, Yasutoshi ; Ezura, Kai ; Yoshida, Kazumasa ; Yugawa, Takashi ; Narisawa-Saito, Mako ; Kiyono, Tohru ; Ohta, Satoshi ; Obuse, Chikashi ; Fujita, Masatoshi. / Involvement of human ORC and TRF2 in pre-replication complex assembly at telomeres. :: Genes to Cells. 2008 ; 巻 13, 番号 10. pp. 1045-1059.
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abstract = "The origin recognition complex (ORC) binds to replication origins to regulate the cell cycle-dependent assembly of pre-replication complexes (pre-RCs). We have found a novel link between pre-RC assembly regulation and telomere homeostasis in human cells. Biochemical analyses showed that human ORC binds to TRF2, a telomere sequence-binding protein that protects telomeres and functions in telomere length homeostasis, via the ORC1 subunit. Immunostaining further revealed that ORC and TRF2 partially co-localize in nuclei, whereas chromatin immuno- precipitation analyses confirmed that pre-RCs are assembled at telomeres in a cell cycle-dependent manner. Over-expression of TRF2 stimulated ORC and MCM binding to chromatin and RNAi-directed TRF2 silencing resulted in reduced ORC binding and pre-RC assembly at telomeres. As expected from previous reports, TRF2 silencing induced telomere elongation. Interestingly, ORC1 silencing by RNAi weakened the TRF2 binding as well as the pre-RC assembly at telomeres, suggesting that ORC and TRF2 interact with each other to achieve stable binding. Furthermore, ORC1 silencing also resulted in modest telomere elongation. These data suggest that ORC might be involved in telomere homeostasis in human cells.",
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