Cited by 264Neurobiology and Insect Physiology ResearchNeuroscience and Neuropharmacology ResearchVisual perception and processing mechanisms

Synaptic circuits and their variations within different columns in the visual system of Drosophila

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Takemura, Shin-ya, Xu, C. Shan, Lu, Zhiyuan, Rivlin, Patricia K., Parag, Toufiq, Olbris, Donald J., Plaza, Stephen, Zhao, Ting +21 more·2015·Proceedings of the National Academy of Sciences

Abstract

Significance: Circuit diagrams of brains are generally reported only as absolute or consensus networks; these diagrams fail to identify the accuracy of connections, however, for which multiple circuits of the same neurons must be documented. For this reason, the modular composition of the Drosophila visual system, with many identified neuron classes, is ideal. Using EM, we identified synaptic connections in the fly’s second visual relay neuropil, or medulla, in the 20 neuron classes in a so-called “core connectome,” those neurons present in seven neighboring columns. These connections identify circuits for motion. Their error rates for wiring reveal that <1% of contacts overall are not part of a consensus circuit but incorporate errors of either omission or commission. Autapses are occasionally seen.

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  • The FIB-25 dataset volume comprises seven medulla columns and the FIB-19 dataset volume comprises the entire optic lobe and detailed connectivity information for inputs to both the T4 and T5 pathways.

    “The FIB-25 dataset volume comprises seven medulla columns and the FIB-19 dataset volume comprises the entire optic lobe and, in particular, detailed connectivity information for inputs to both the T4 and T5 pathways2–4.”

    From Connectome-constrained networks predict neural activity across the fly visual system (2024) · cites this paper as [2]

    The Results describe an EM image stack of seven medulla columns, and Data availability identifies the paper’s dataset as FIB-25 (page numbers unavailable). Our copy does not describe a FIB-19 dataset, an entire-optic-lobe volume, or detailed inputs to both T4 and T5 pathways. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Dm9 neurons have ~20-fold more autapses than usual.

    “Dm9 neurons have ∼ 20-fold more autapses (self-connections) than usual,178”
  • The computational model of the fly visual system is consistent with available connectome data.

    “We built a computational model of the fly visual system that is consistent with available connectome data1–5, has biophysically plausible neural dynamics, and can be computationally trained to solve an ethologically relevant behavioural task, namely the estimation of optic flow.”
  • Two previous connectomics efforts are available as well.

    “Two previous connectomics efforts are available as well (a seven-column optic lobe reconstruction [Takemura et al., 2015] and the alpha lobe of the mushroom body [Takemura et al., 2017]).”

    From A connectome and analysis of the adult Drosophila central brain (2020) · cites this paper as Takemura et al., 2015

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Authors
Takemura, S.-Y., Xu, C. S., Lu, Z., Rivlin, P. K., Parag, T., Olbris, D. J., Plaza, S., Zhao, T., Katz, W. T., Umayam, L., Weaver, C., Hess, H. F., Horne, J. A., Nunez-Iglesias, J., Aniceto, R., Chang, L.-A., Lauchie, S., Nasca, A., Ogundeyi, O., Sigmund, C., Takemura, S., Tran, J., Langille, C., Le Lacheur, K., McLin, S., Shinomiya, A., Chklovskii, D. B., Meinertzhagen, I. A., & Scheffer, L. K.
Affiliations
  • Howard Hughes Medical Institute (US)
  • Dalhousie University (CA)
  • The University of Melbourne (AU)
  • Department of Psychology and Neuroscience, Dalhousie University, Halifax, NS, Canada B3H 4R2;
  • Simons Foundation (US)
Corresponding author
Scheffer, Louis K.
Venue
Proceedings of the National Academy of Sciences
Published
2015-10-19
Volume
112
Issue
44
Pages
13711-13716
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2232480453
Cited by
264
References
56
Citations by year
2026: 11 · 2025: 14 · 2024: 28 · 2023: 29 · 2022: 26 · 2021: 24 · 2020: 39 · 2019: 25 · 2018: 28 · 2017: 28 · 2016: 9 · 2015: 1 · 2014: 1
FWCI
10.26
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Howard Hughes Medical Institute
  • Dalhousie University
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
Keywords
synaptic circuits, visual system, connectomics, autapses, synapse number, neuronal connectivity
MeSH terms
Animals, Drosophila melanogaster, Synapses, Vision, Ocular

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