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The Maintenance of ATM Dependent G2/M Checkpoint Arrest Following Exposure to Ionizing Radiation
http://hdl.handle.net/10069/21794
http://hdl.handle.net/10069/21794856139d3-b02c-4b46-833d-784cbe2d5602
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
acta_53_supl_19.pdf (70.9 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2009-05-01 | |||||
| タイトル | ||||||
| タイトル | The Maintenance of ATM Dependent G2/M Checkpoint Arrest Following Exposure to Ionizing Radiation | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Cell cycle checkpoints | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | DNA damage response | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | ATM signalling | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Radiation sensitivity | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 著者 |
Shibata, Atsushi
× Shibata, Atsushi× Barton, Olivia× Noon, T. Angela× Dahm, Kirsten× Deckbar, Dorothee× Goodarzi, A. Aaron× Lobrich, Markus× Jeggo, A. Penny |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The G2/M checkpoint is important in preventing cells with unrepaired DNA double strand breaks (DSBs) entering mitosis, an event which is likely to result in genomic instability. We recently reported that checkpoint arrest is maintained until close to completion of DSB repair and that the duration of checkpoint arrest depends on the dose and DSB repair capacity rather than lasting for a fixed period of time. ATM leads to phosphorylation of Chk1/2 in G2 phase following exposure to ionizing radiation. These transducer kinases can phosphorylate and inhibit Cdc25 activity, which is the phosphatase regulating mitotic entry. In this study we dissect three processes that contribute to the maintenance of checkpoint arrest in irradiated G2 phase cells. First, the ATR-Chk1 pathway contributes to maintaining checkpoint arrest, although it is dispensable for the initial activation of checkpoint arrest. Second, ongoing ATM to Chk2 signalling from unrepaired DSBs contributes to checkpoint arrest. This process plays a greater role in a repair defective background. Finally, slow decay of the initially activated Chk2 also contributes to the maintenance of checkpoint arrest. 53BP1 and MDC1 defective cells show an initial checkpoint defect after low doses but are proficient in initial activation of arrest after high doses. After higher radiation doses, however, 53BP1-/- and MDC1-/- MEFs fail to maintain checkpoint arrest. Furthermore 53BP1-/- and MDC1-/- MEFs display elevated mitotic breakage even after high doses. We show that the defect in the maintenance of checkpoint arrest conferred by 53BP1 and MDC1 deficiency substantially enhances chromosome breakage. | |||||
| 書誌情報 |
Acta medica Nagasakiensia 巻 53, 号 supl., p. 19-21, 発行日 2009-03 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00016055 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA00508430 | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 関係URI | ||||||
| 関連名称 | http://joi.jlc.jst.go.jp/JST.JSTAGE/amn/53.S19 | |||||
| 引用 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Acta medica Nagasakiensia, 53(supl.), pp.19-21 ; 2009 | |||||
