Activity-Independent Prespecification of Synaptic Partners in the Visual Map of Drosophila

P. Robin Hiesinger, Rong G Zhai, Yi Zhou, Tong Wey Koh, Sunil Q. Mehta, Karen L. Schulze, Yu Cao, Patrik Verstreken, Thomas R. Clandinin, Karl Friedrich Fischbach, Ian A. Meinertzhagen, Hugo J. Bellen

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Specifying synaptic partners and regulating synaptic numbers are at least partly activity-dependent processes during visual map formation in all systems investigated to date [1-5]. In Drosophila, six photoreceptors that view the same point in visual space have to be sorted into synaptic modules called cartridges in order to form a visuotopically correct map [6, 7]. Synapse numbers per photoreceptor terminal and cartridge are both precisely regulated [8-10]. However, it is unknown whether an activity-dependent mechanism or a genetically encoded developmental program regulates synapse numbers. We performed a large-scale quantitative ultrastructural analysis of photoreceptor synapses in mutants affecting the generation of electrical potentials (norpA, trp;trpl), neurotransmitter release (hdc, syt), vesicle endocytosis (synj), the trafficking of specific guidance molecules during photoreceptor targeting (sec15), a specific guidance receptor required for visual map formation (Dlar), and 57 other novel synaptic mutants affecting 43 genes. Remarkably, in all these mutants, individual photoreceptors form the correct number of synapses per presynaptic terminal independently of cartridge composition. Hence, our data show that each photoreceptor forms a precise and constant number of afferent synapses independently of neuronal activity and partner accuracy. Our data suggest cell-autonomous control of synapse numbers as part of a developmental program of activity-independent steps that lead to a "hard-wired" visual map in the fly brain.

Original languageEnglish
Pages (from-to)1835-1843
Number of pages9
JournalCurrent Biology
Volume16
Issue number18
DOIs
StatePublished - Sep 19 2006
Externally publishedYes

Fingerprint

synapse
photoreceptors
Synapses
Drosophila
mutants
Chemical analysis
Neurotransmitter Agents
Brain
Genes
Presynaptic Terminals
endocytosis
neurotransmitters
Endocytosis
Diptera
Molecules
quantitative analysis
brain
receptors
genes
cells

Keywords

  • MOLNEURO

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Hiesinger, P. R., Zhai, R. G., Zhou, Y., Koh, T. W., Mehta, S. Q., Schulze, K. L., ... Bellen, H. J. (2006). Activity-Independent Prespecification of Synaptic Partners in the Visual Map of Drosophila. Current Biology, 16(18), 1835-1843. https://doi.org/10.1016/j.cub.2006.07.047

Activity-Independent Prespecification of Synaptic Partners in the Visual Map of Drosophila. / Hiesinger, P. Robin; Zhai, Rong G; Zhou, Yi; Koh, Tong Wey; Mehta, Sunil Q.; Schulze, Karen L.; Cao, Yu; Verstreken, Patrik; Clandinin, Thomas R.; Fischbach, Karl Friedrich; Meinertzhagen, Ian A.; Bellen, Hugo J.

In: Current Biology, Vol. 16, No. 18, 19.09.2006, p. 1835-1843.

Research output: Contribution to journalArticle

Hiesinger, PR, Zhai, RG, Zhou, Y, Koh, TW, Mehta, SQ, Schulze, KL, Cao, Y, Verstreken, P, Clandinin, TR, Fischbach, KF, Meinertzhagen, IA & Bellen, HJ 2006, 'Activity-Independent Prespecification of Synaptic Partners in the Visual Map of Drosophila', Current Biology, vol. 16, no. 18, pp. 1835-1843. https://doi.org/10.1016/j.cub.2006.07.047
Hiesinger, P. Robin ; Zhai, Rong G ; Zhou, Yi ; Koh, Tong Wey ; Mehta, Sunil Q. ; Schulze, Karen L. ; Cao, Yu ; Verstreken, Patrik ; Clandinin, Thomas R. ; Fischbach, Karl Friedrich ; Meinertzhagen, Ian A. ; Bellen, Hugo J. / Activity-Independent Prespecification of Synaptic Partners in the Visual Map of Drosophila. In: Current Biology. 2006 ; Vol. 16, No. 18. pp. 1835-1843.
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