microRNA-125 distinguishes developmentally generated and adult-born olfactory bulb interneurons

Malin Åkerblom, Rebecca Petri, Rohit Sachdeva, Thies Klussendorf, Bengt Mattsson, Bernhard Gentner, Johan Jakobsson

Research output: Contribution to journalArticlepeer-review

Abstract

New neurons, originating from the subventricular zone, are continuously integrating into neuronal circuitry in the olfactory bulb (OB). Using a transgenic sensor mouse, we found that adult-born OB interneurons express microRNA-125 (miR-125), whereas the preexisting developmentally generated OB interneurons represent a unique population of cells in the adult brain, without miR-125 activity. Stable inhibition of miR-125 in newborn OB neurons resulted in enhanced dendritic morphogenesis, as well as in increased synaptic activation in response to odour sensory stimuli. These data demonstrate that miR-125 controls functional synaptic integration of adult-born OB interneurons. Our results also suggest that absence of an otherwise broadly expressed miRNA is a novel mechanism with which to achieve neuronal subtype specification.

Original languageEnglish
Pages (from-to)1580-1588
Number of pages9
JournalDevelopment
Volume141
Issue number7
DOIs
Publication statusPublished - Apr 1 2014

Keywords

  • microRNA
  • Mouse
  • Neurogenesis
  • Olfactory bulb

ASJC Scopus subject areas

  • Developmental Biology
  • Molecular Biology

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