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Glycoconjugate expression during Drosophila embryogenesis

J R Fredieu1, A P Mahowald

  • 1Department of Genetics, Case Western Reserve University, Cleveland, Ohio.

Acta Anatomica
|January 1, 1994
PubMed
Summary
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Plant lectins revealed complex glycan structures on Drosophila neurons. Specific lectin receptors (BPA, PNA, SBA) were identified on neuronal surfaces, suggesting roles in axon guidance and cell adhesion during development.

Area of Science:

  • Developmental Biology
  • Neuroscience
  • Glycobiology

Background:

  • Cell surface glycoproteins and glycoconjugates play diverse roles.
  • Glycan structure variation and heterogeneity are significant in cell biology.
  • Plant lectins are valuable tools for surveying cell surface carbohydrates.

Purpose of the Study:

  • To investigate the roles of glycoconjugates in embryonic Drosophila neurogenesis.
  • To characterize lectin receptor molecules on neuronal and non-neuronal cells during axon development.

Main Methods:

  • Used a collection of plant lectins with various specificities.
  • Surveyed lectin receptor expression on cultured neurons and in intact embryos.
  • Precipitated lectin receptors from culture homogenates using specific lectins.

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Main Results:

  • Uncovered complex glycan structure expression patterns.
  • Identified D-galactose-specific lectin receptors (BPA, PNA) on central and peripheral nervous system neurons.
  • Found soybean agglutinin (SBA) receptors on non-neuronal cells in intact embryos.
  • All three lectins recognized high molecular weight glycoproteins.

Conclusions:

  • Lectin receptor glycoproteins are present at key temporal and spatial positions in the developing Drosophila embryo.
  • These glycoproteins likely play critical roles in axon guidance, target acquisition, and morphogenic adhesion.