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Neurulation01:30

Neurulation

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Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
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The insect central complex as model for heterochronic brain development-background, concepts, and tools.

Nikolaus Dieter Bernhard Koniszewski1,2, Martin Kollmann3, Mahdiyeh Bigham1

  • 1Department of Evolutionary Developmental Genetics, Johann-Friedrich-Blumenbach Institute, GZMB, CNMPB, Georg-August-University Göttingen, Göttingen Campus, Göttingen, Germany.

Development Genes and Evolution
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Summary

Investigating insect brain evolution requires comparing homologous neural cells across species like Drosophila, Tribolium, and Gryllus. Genome editing and new tools for Tribolium aid understanding brain diversification and developmental timing differences.

Keywords:
BrainCentral complexDrosophilaEvolutionHeterochronyTribolium

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Developmental Biology

Background:

  • Insect brains exhibit diverse neuropil morphology and developmental timing across species.
  • Genetic mechanisms driving insect brain evolution and heterochrony remain largely unknown.
  • Drosophila melanogaster is a primary model, but comparative studies are needed.

Purpose of the Study:

  • Propose a novel comparative approach using genome editing to study insect brain evolution.
  • Investigate cellular and genetic mechanisms underlying neuropil diversity and heterochronic development.
  • Utilize comparative genomics and developmental timing to understand brain diversification.

Main Methods:

  • Employ genome editing to label homologous neural cells in Drosophila, Tribolium, and Gryllus.
  • Analyze heterochrony in central complex development across species.
  • Develop and apply tools for Tribolium brain research, including 3D reconstruction and transgenic lines.

Main Results:

  • Highlight heterochrony in central complex development: embryonic in Gryllus, larval/metamorphic in Drosophila, partial embryonic in Tribolium.
  • Present new tools for Tribolium brain research, including imaging lines and reporter lines.
  • Characterize reporter lines for mushroom bodies and neuroblast marker Tc-asense in Tribolium.

Conclusions:

  • Comparative studies using genome editing are crucial for understanding insect brain evolution.
  • Heterochrony in developmental timing significantly contributes to brain diversification.
  • Advanced tools for model organisms like Tribolium facilitate comparative neurodevelopmental research.