Progenitor properties of symmetrically dividing Drosophila neuroblasts during embryonic and larval development

Atsushi Kitajima, Naoyuki Fuse, Takako Isshiki, Fumio Matsuzaki

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Asymmetric cell division generates two daughter cells of differential gene expression and/or cell shape. Drosophila neuroblasts undergo typical asymmetric divisions with regard to both features; this is achieved by asymmetric segregation of cell fate determinants (such as Prospero) and also by asymmetric spindle formation. The loss of genes involved in these individual asymmetric processes has revealed the roles of each asymmetric feature in neurogenesis, yet little is known about the fate of the neuroblast progeny when asymmetric processes are blocked and the cells divide symmetrically. We genetically created such neuroblasts, and found that in embryos, they were initially mitotic and then gradually differentiated into neurons, frequently forming a clone of cells homogeneous in temporal identity. By contrast, larval neuroblasts with the same genotype continued to proliferate without differentiation. Our results indicate that asymmetric divisions govern lineage length and progeny fate, consequently generating neural diversity, while the progeny fate of symmetrically dividing neuroblasts depends on developmental stages, presumably reflecting differential activities of Prospero in the nucleus.

Original languageEnglish
Pages (from-to)9-23
Number of pages15
JournalDevelopmental Biology
Volume347
Issue number1
DOIs
Publication statusPublished - 2010 Nov 1
Externally publishedYes

Keywords

  • Asymmetric cell division
  • Differentiation
  • Neuroblast
  • Polarity
  • Prospero
  • Self-renewal
  • Stem cell
  • Temporal identity

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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