Regulating neural proliferation in the Drosophila CNS

Curr Opin Neurobiol. 2010 Feb;20(1):50-7. doi: 10.1016/j.conb.2009.12.005. Epub 2010 Jan 14.

Abstract

Neural stem and progenitor cells generate the central nervous system (CNS) in organisms as diverse as insects and mammals. In Drosophila, multipotent asymmetrically dividing progenitors called neuroblasts produce neurons and glia throughout the developing CNS. Nevertheless, the time-windows of mitotic activity, the division modes, the termination mechanisms and the lineage sizes of individual neuroblasts all vary considerably from region-to-region. Recent studies shed light on some of the mechanisms underlying this neuroblast diversity and, in particular, how proliferation is boosted in two brain regions. In the central brain, some specialised neuroblasts generate intermediate neural progenitors that can each divide multiple times, thus increasing overall lineage size. In the optic lobe, an alternative expansion strategy involves symmetrically dividing neuroepithelial cells generating large numbers of asymmetrically dividing neuroblasts. Evidence is also emerging for a cell-intrinsic timer that alters the properties of each neuroblast with increasing developmental age. The core mechanism corresponds to a series of transcription factors that coordinates temporal changes in neuronal/glial identity with transitions in neuroblast cell-cycle speed, entry into quiescence and, ultimately, with termination.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Cell Division / physiology
  • Cell Proliferation*
  • Central Nervous System / cytology*
  • Central Nervous System / physiology
  • Drosophila / cytology*
  • Drosophila / physiology
  • Neurons / cytology*
  • Neurons / physiology
  • Stem Cells / cytology
  • Stem Cells / physiology*