2004 Fiscal Year Final Research Report Summary
Molecular system ensuring genomic inheritance through successive generations
| Project/Area Number |
14208088
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Cell biology
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
KISHIMOTO Takeo Tokyo Institute of Technology, Grad. Sch. Biosci. & Biotech., Professor, 大学院生命理工学研究科, 教授 (00124222)
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| Co-Investigator(Kenkyū-buntansha) |
OHSUMI Keita Tokyo Institute of Technology, Grad. Sch. Biosci. & Biotech., Associate Professor, 大学院生命理工学研究科, 助教授 (20221822)
TACHIBANA Kazunori Tokyo Institute of Technology, Grad. Sch. Biosci. & Biotech., Assistant Professor, 大学院生命理工学研究科, 助手 (60212031)
OKUMURA Eiichi Tokyo Institute of Technology, Grad. Sch. Biosci. & Biotech., Assistant Professor, 大学院生命理工学研究科, 助手 (00323808)
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| Project Period (FY) |
2002 – 2004
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| Keywords | cell cycle control / nuclear formation / meiosis / fertilization / DNA replication / signal transduction / cyclin-CDK / Mos-MAPK |
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| Research Abstract |
Molecular mechanisms that ensure genomic inheritance through successive generations have been studied, based on the cell cycle control and the nuclear formation. Our findings are summarized below.
1. Meiotic cell cycle progression : Almost complete signaling pathway that leads to meiotic reinitiation in starfish oocytes has been revealed to be composed of the putative receptor for maturation-inducing hormone, 1-MeAde / Gβ1γ2 / I-β type PI3-kinase / PDK1 and putative PDK2 / Akt (PKB) / Cdc2-cyclin B / Plk1. After meiotic reinitiation, p90Rsk is activated immediately downstream of the Mos-MAPK pathway to regulate positively both meiosis I to II transition and G1-phase arrest after completion of meiosis II.
2. Formation of male and female pronuclei : Cell-free extracts derived from Xenopus oocytes or eggs were utilized to analyze these processes. Upon fertiliztion, NAP1 functions as a molecular chaperone for histone H1 at the chromatin remodeling in sperm nuclei. During oocyte maturation, the ability of nuclear import that depends on importin α is accelerated, and the LI-type nuclear lamin is newly synthesized, possibly providing a clue to understand how the ability for nuclear formation is acquired in this period.
3. Initiation of S-phase upon fertilization : In unfertilized mature eggs of starfish, MCMs are already loaded onto chromatin in female pronucleus, but the loading of Cdc45, which allows the loading of DNA polymerase a to DNA, is prevented downstream of the Mos-MAPK-p90Rsk pathway. Abolishment of p90Rsk activity is sufficient for initiation of DNA replication, thus providing a clue to answer the classic question in biology how fertilization initiates S-phase.
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Research Products
(21 results)
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[Journal Article] Nucleosome assembly protein-1 is a linker histone chaperone in Xenopus eggs.2005
Author(s)
Shintomi, K., Iwabuchi, M., Saeki, H., Ura, K., Kishimoto, T., Ohsumi, K.
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Journal Title
Proc.Natl.Acad.Sci.USA 102
Pages: 8210-8215
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] PDK1 is required for the hormonal signalling pathway leading to meiotic resumption in starfish oocytes.2004
Author(s)
Hiraoka, D., Hori-Oshima, S., Fukuhara, T., Tachibana, K., Okumura, E., Kishimoto, T.
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Journal Title
Dev.Biol. 276
Pages: 330-336
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Distinct regulators for Plk1 activation in starfish meiotic and early embryonic cycles.2003
Author(s)
Okano-Uchida, T., Okumura, E., Iwashita, M., Yoshida, H., Tachibana, K., Kishimoto, T.
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Journal Title
EMBO J. 22
Pages: 5633-5642
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Akt inhibits Myt1 in the signalling pathway that leads to meiotic G2/M-phase transition.2002
Author(s)
Okumura, E., Fukuhara, T., Yoshida, H., Hanada, S., Kozutsumi, R., Mori, M., Tachibana, K., Kishimoto, T.
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Journal Title
Nature Cell Biol. 4
Pages: 111-116
Description
「研究成果報告書概要(欧文)」より
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[Book] 発生における細胞増殖制御2004
Author(s)
竹内隆, 岸本健雄(編集)
Total Pages
198
Publisher
シュプリンガーフェアラーク東京
Description
「研究成果報告書概要(和文)」より
