ZFIN ID: ZDB-PUB-120522-10
miR-9 Controls the Timing of Neurogenesis through the Direct Inhibition of Antagonistic Factors
Coolen, M., Thieffry, D., Drivenes, O., Becker, T.S., and Bally-Cuif, L.
Date: 2012
Source: Developmental Cell   22(5): 1052-1064 (Journal)
Registered Authors: Bally-Cuif, Laure, Becker, Thomas S., Drivenes, Oyvind
Keywords: none
MeSH Terms:
  • Alanine/analogs & derivatives
  • Alanine/pharmacology
  • Animals
  • Azepines/pharmacology
  • Basic Helix-Loop-Helix Transcription Factors/metabolism
  • Cell Cycle/genetics
  • Cell Cycle/physiology*
  • Cell Differentiation/physiology
  • DNA-Binding Proteins/metabolism
  • ELAV Proteins/metabolism
  • ELAV-Like Protein 3
  • MicroRNAs/genetics
  • MicroRNAs/metabolism*
  • Neurogenesis/genetics
  • Neurogenesis/physiology*
  • Neurons/cytology
  • Neurons/physiology*
  • Zebrafish/genetics
  • Zebrafish/physiology*
  • Zebrafish Proteins/metabolism
PubMed: 22595676 Full text @ Dev. Cell

The timing of commitment and cell-cycle exit within progenitor populations during neurogenesis is a fundamental decision that impacts both the number and identity of neurons produced during development. We show here that microRNA-9 plays a key role in this process through the direct inhibition of targets with antagonistic functions. Across the ventricular zone of the developing zebrafish hindbrain, miR-9 expression occurs at a range of commitment stages. Abrogating miR-9 function transiently delays cell-cycle exit, leading to the increased generation of late-born neuronal populations. Target protection analyses in vivo identify the progenitor-promoting genes her6 and zic5 and the cell-cycle exit-promoting gene elavl3/HuC as sequential targets of miR-9 as neurogenesis proceeds. We propose that miR-9 activity generates an ambivalent progenitor state poised to respond to both progenitor maintenance and commitment cues, which may be necessary to adjust neuronal production to local extrinsic signals during late embryogenesis.