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Postembryonic brain development in the monarch butterfly,Danaus plexippus plexippus, L. : I. Cellular events during
Ruth H Nordlander1, John S Edwards1,2
1Developmental Biology Center, Case Western Reserve University, Cleveland, Ohio.
Wilhelm Roux' Archiv Fur Entwicklungsmechanik Der Organismen
|March 18, 2017
Summary
Neurogenesis in monarch butterfly brains is continuous, with new neurons forming throughout larval and pupal stages. Glial cells, however, proliferate specifically during molting periods, contributing to brain development.
Area of Science:
- Developmental Biology
- Neuroscience
- Insect Morphology
Background:
- Postembryonic brain development in insects involves complex cellular processes.
- Understanding neurogenesis and glial cell proliferation is crucial for comprehending insect brain formation.
Purpose of the Study:
- To investigate cellular morphogenesis during postembryonic brain development in Danaus plexippus.
- To elucidate the timing and mechanisms of neuroblast and glial cell production.
Main Methods:
- Histological techniques, including radioautography with Tritiated Thymidine (H³TdR) injection.
- Examination of brain tissues at progressive intervals after H³TdR administration.
Main Results:
- Continuous neuron production throughout larval and pupal stages, independent of molting.
- Glial cell production occurs specifically around molting periods.
- Neurogenesis involves asymmetrical divisions of neuroblasts, with ganglion-mother cells forming new neurons.
- Scattered neuroblasts degenerate post-pupation; glial cells proliferate via existing cells, except in the developing optic lobe.
Conclusions:
- Monarch butterfly brain development exhibits distinct temporal patterns for neurogenesis and glial cell proliferation.
- The study details the cellular lineage and spatial arrangement of developing neurons and glia.
- Glial cell development shows unique patterns in the optic lobe and during perineurial remodeling.
