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Related Experiment Video

Updated: Jun 29, 2026

Assaying Circuit Specific Regulation of Adult Hippocampal Neural Precursor Cells
08:52

Assaying Circuit Specific Regulation of Adult Hippocampal Neural Precursor Cells

Published on: July 24, 2019

Dscam-mediated cell recognition regulates neural circuit formation.

Daisuke Hattori1, S Sean Millard, Woj M Wojtowicz

  • 1Department of Biological Chemistry, Howard Hughes Medical Institute, David Geffen School of Medicine, University of California, Los Angeles, California 90095, USA.

Annual Review of Cell and Developmental Biology
|October 8, 2008
PubMed
Summary

Dscam proteins mediate neural circuit assembly through self-avoidance and tiling. These cell surface proteins ensure proper wiring in flies and mice, with varied roles in chicks.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • The Dscam (Down syndrome cell adhesion molecule) protein family is crucial for neural circuit formation.
  • Alternative splicing of Dscam1 in Drosophila generates numerous isoforms with specific binding properties.
  • These isoforms mediate homophilic repulsion, a mechanism essential for neuronal self-avoidance and tiling.

Purpose of the Study:

  • To investigate the role of Dscam proteins in neural circuit assembly.
  • To understand the mechanisms of self-avoidance and tiling mediated by Dscam isoforms.
  • To compare the functions of Dscam proteins across different species.

Main Methods:

  • Analysis of Dscam1 alternative splicing in Drosophila.
  • In vitro binding assays to assess isoform-specific interactions.

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  • Genetic studies in Drosophila, mouse, and chick visual systems.

    • Main Results:

    • Drosophila Dscam1 isoforms exhibit isoform-specific binding and mediate homophilic repulsion for self-avoidance and tiling.
    • Vertebrate DSCAM in mice also promotes self-avoidance and tiling.
    • In chicks, DSCAM and DSCAM-L appear to mediate layer-specific targeting via homophilic adhesion.

    Conclusions:

    • Homophilic repulsion mediated by Dscam proteins is vital for neural circuit assembly in flies and mice.
    • Dscam proteins can mediate diverse recognition events in a context-dependent manner during neural wiring.
    • Dscam's varied roles highlight its importance in establishing complex neural architectures.