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ZFIN ID: ZDB-PUB-161027-1
A Nuclear Role for miR-9 and Argonaute Proteins in Balancing Quiescent and Activated Neural Stem Cell States
Katz, S., Cussigh, D., Urbán, N., Blomfield, I., Guillemot, F., Bally-Cuif, L., Coolen, M.
Date: 2016
Source: Cell Reports   17: 1383-1398 (Journal)
Registered Authors: Bally-Cuif, Laure, Coolen, Marion, Cussigh, Delphine, Katz, Shauna
Keywords: Argonaute, Notch, adult neurogenesis, miR-9, neural stem cell, quiescence, radial glia, telencephalon, zebrafish
MeSH Terms:
  • Aging/metabolism
  • Animals
  • Argonaute Proteins/metabolism
  • Cell Cycle*
  • Cell Nucleus/metabolism
  • Gene Expression Regulation
  • Mice
  • MicroRNAs/genetics
  • MicroRNAs/metabolism*
  • Models, Biological
  • Neural Stem Cells/cytology*
  • Neural Stem Cells/metabolism*
  • Neuroglia/metabolism
  • Receptors, Notch/metabolism
  • Signal Transduction
  • Telencephalon/metabolism
  • Zebrafish/genetics*
  • Zebrafish/metabolism
PubMed: 27783951 Full text @ Cell Rep.
FIGURES
ABSTRACT
Throughout life, adult neural stem cells (NSCs) produce new neurons and glia that contribute to crucial brain functions. Quiescence is an essential protective feature of adult NSCs; however, the establishment and maintenance of this state remain poorly understood. We demonstrate that in the adult zebrafish pallium, the brain-enriched miR-9 is expressed exclusively in a subset of quiescent NSCs, highlighting a heterogeneity within these cells, and is necessary to maintain NSC quiescence. Strikingly, miR-9, along with Argonaute proteins (Agos), is localized to the nucleus of quiescent NSCs, and manipulating their nuclear/cytoplasmic ratio impacts quiescence. Mechanistically, miR-9 permits efficient Notch signaling to promote quiescence, and we identify the RISC protein TNRC6 as a mediator of miR-9/Agos nuclear localization in vivo. We propose a conserved non-canonical role for nuclear miR-9/Agos in controlling the balance between NSC quiescence and activation, a key step in maintaining adult germinal pools.
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