| Project/Area Number |
12680703
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 University of Science |
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Principal Investigator |
KENJI Matsuno Faculty of Industrial Science andTechnology, Associate Professor, 基礎工学部, 助教授 (60318227)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Notch / β-amyloid / Alzheimer's deaease / Presenilin / Drosophila / Genetic screen / proteinase / Cell signaling / β-アミロイド / β-アミロイド前駆体タンパク質 / Presenilin / アルツハイマー症候群 / γ-Secretase |
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| Research Abstract |
Local cell-cell interactions are essential for the development of multicellular organisms. Notch signaling is involved in cell-cell communications that regulate a broad spectrum of cell-fate determinations in organisms ranging from the fly to mammals.
In Drpfophila, Notch encodes a 300-kDa single-pass transmembrane receptor. There are strong evidences supporting the idea that the ligand-dependent activation of Notch induces proteolytic cleavage of Notch itself, so that the intracellular domain of Notch is released from the cell mdmbrane and moves to the nucleus. This cleavage was shown to depend on the function of Presenilin and a γ-secretase-like proteinase. It has been known that Presenilin and the γ-secretase-like proteinase also cleave β-Amyloid precursor protein (β-APP) to generate the pathogenic β-Amyloid polypeptides. Namely, it suggests that Notch and β-APP are common substrates for and the γ-secretase-like p roteinase.
In this study, we screened genes that were essential for Notch signaling, because they may encode the γ-secretase-like proteinase or a protein essential for a function of the γ-secretase-like proteinase. . We found a mutant, named as neurotic, is a novel maternal neurogenic gene. In all organs tested, the function of neurotic is essential for Notch signaling, neurotic interacted genetically with mutations of the genes involved in Notch signaling. We identified a genomic region that contains neurotic locus as a single transcription unit. Currently, the function of neurotic in Notch signaling is investigated.
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