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2002 Fiscal Year Final Research Report Summary

Molecular anatomy of synaptic development in the microbrain

Research Project

Project/Area Number 11168210
Research Category

Grant-in-Aid for Scientific Research on Priority Areas (A)

Allocation TypeSingle-year Grants
Review Section Biological Sciences
Research InstitutionThe University of Tokyo

Principal Investigator

SUZUKI Emiko  Inst. Medical Science, Univ. Tokyo, Research Associate, 医科学研究所, 助手 (20173891)

Project Period (FY) 1999 – 2001
Keywordssynapse / Drosophila / microbrain / mutant / neural network / immunocytochemisty / electron microscopy
Research Abstract

The neural network in the microbrain is quite precise at the single cell level. We have investigated how such elaborated systems are formed under genetic control, focusing on the synapse formation. Using Drosophila, in which many genetic tools are available, we have examined the subcellular localizations of several proteins that are involved in synaptic development by immunoelectron microscopy. And by the ultrastructural analysis of genetic mutants or ectopic expression experiments, we could get following results concerning the genetic mechanisms of the cell-specific formation of microbrain synapses.
1. Analysis of proteins involved in synapse formation (HIG, SIF, TRIO etc.) : HIG was localized in synaptic clefts. And the HIG expression experiments in mutant pupae indicated that it is required for synapse formation. SIF and TRIO are GTP-GDP exchange factors, and they were shown to regulate synapse morphogenesis. SIF localized in the pre-synaptic peri-active zone, and appeared to function in coordination with Fas2. TRIO was distributed in all regions of a neuron, and was shown to be involved in axonal elongation.
2. Ultrastructural analysis of identified synapses by single cell labeling :
(1) By crossing Ga14 enhancer trap lines with a UAS-WGA line, or a UAS-GFP or a UAS-CD8 : : GFP line, we could identified synaptic terminal of single cells in the electron microscope.
(2) By crossing GAL4 enhancer trap lines and a UAS-gap-GFP line we demonstrated that the filopodia elongated from growth cones and target cells intermingle each other and increase adhesional structures, using fluorescence microscopy and electron microscopy. And, the ectopic expression of target recognition molecules such as Fas3 and Toll, indicated that this process is mediated by these molecules.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] M.Hoshino: "Neural expression of hikaru genki protein during embryonic and larval development of Drosophila melanogaster"Dev.Genes Evol.. 209. 1-9 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tabuchi: "The GAL4/UAS system as a powerful tool for tracing Drosophila transsynaptic neural pathways"J.Neurosci.Res.. 59. 94-99 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Suzuki: "The ultrastructural interactions of identidies pre-and postsynaptic cells during synaptic target recognition in Drosophila embryos"J.Neurobiol.. 43. 448-459 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Awasaki: "The Drosophila TRIO plays an essential role for patterning of axons by regulating their directional extension"Neuron. 26. 119-132 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ritzenthaler: "Myopodia : Postsynaptic filopodia that interact with innervating motoneuron axons"Nature neurosci.. 3. 1012-1017 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Sone: "Synaptic development is controlled in the periactive zones of Drosophila"Development. 127. 4157-4168 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Tsunoda: "Independent anchoring and assembly mechanisms of INAD-signaling complexes in Drosophila Photoreceptors"J.Neurosci.. 21. 150-158 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Eguchi(ed.): "Atlas of Arthropod Sensory Receptors"Springer-Verlag. 220 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Hoshino: "Neural expression of hikaru genki protein during embryonic and larval developmet of Drosophila melanogaster"Dev. Genes Evol.. 209. 1-9 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Tabuchi: "The Gal4/UAS-WGA system as a powerful tool for tracing Drosophila transsynaptic neural pathways"J. Neurosci. Res.. 59. 94-99 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E. Suzuki: "The Ultrastructural interactions of identified pre- and postsynaptic cells during synaptic target recognition in Drosophila embryos"J. Neurobiol.. 43. 448-459 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Awasaki: "The Drosophila TRIO plays an essential role for patterning of axons by regulating their directional extension"Neuron. 26. 119-132 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Ritzenthaler: "Myopodia : Postsynaptic fllopodia that interact with innervating motoneuron axons"Nature Neurosci.. 3. 1012-1017 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Sone: "Synaptic development is controlled in the periactive zones of Drosophila"Development. 127. 4157-4168 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Tsunoda: "Independent anchoring and assembly mechamisms of INAD-signaling complexes in Drosophila photoreceptors"J. Neurosci.. 21. 150-158 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E. Eguchi (ed.): "Atlas of Arthropod Sensory Receptors"Springer-Verlag. 220 (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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