Ascl 1 defines sequentially generated lineage-resricted neuronal and oligodendrocyte precursor cells in the spinal cord

James Battiste, Amy W. Helms, Euiseok J. Kim, Trisha K. Savage, Diane C. Lagace, Chitra D. Mandyam, Amelia J. Eisch, Goichi Miyoshi, Jane E. Johnson

Research output: Contribution to journalArticle

124 Scopus citations

Abstract

The neural basic helix-loop-helix transcription factor Ascl1 (previously Mash1) is present in ventricularzone cells in restricted domains throughout the developing nervous system. This study uses genetic fate mapping to define the stage and neural lineages in the developing spinal cord that are derived from Ascl1-expressing cells. We find that Ascl1 is present in progenitors to both neurons and oligodendrocytes, but not astrocytes. Temporal control of the fate-mapping paradigm reveals rapid cell-cycle exit and differentiation of Ascl1-expressing cells. At embryonic day 11, Ascl1 identifies neuronal-restricted precursor cells that become dorsal horn neurons in the superficial laminae. By contrast, at embryonic day 16, Ascl1 identifies of oligodendrocyte-restricted precursor cells that distribute throughout the spinal cord. These data demonstrate that sequentially generated Ascl1-expressing progenitors give rise first to dorsal horn interneurons and subsequently to late-born oligodendrocytes. Furthermore, Ascl1-null cells in the spinal cord have a diminished capacity to undergo neuronal differentiation, with a subset of these cells retaining characteristics of immature glial cells.

Original languageEnglish (US)
Pages (from-to)285-293
Number of pages9
JournalDevelopment
Volume134
Issue number2
DOIs
StatePublished - Jan 1 2007

Keywords

  • In vivo genetic fate mapping
  • Mash1 (Ascl 1)
  • Mouse
  • Spinal cord development
  • bHLH transcription factor

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology

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