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Dev Biol. 2016 Dec 1;420(1):120-135. doi: 10.1016/j.ydbio.2016.09.022. Epub 2016 Sep 28.

Embryonic origin and lineage hierarchies of the neural progenitor subtypes building the zebrafish adult midbrain.

Author information

1
Paris-Saclay Institute for Neuroscience, CNRS UMR9197 - Université Paris-Sud, Team Zebrafish Neurogenetics, Avenue de la Terrasse, Bldg 5, F-91198 Gif-sur-Yvette, France.
2
Paris-Saclay Institute for Neuroscience, CNRS UMR9197 - Université Paris-Sud, Team Zebrafish Neurogenetics, Avenue de la Terrasse, Bldg 5, F-91198 Gif-sur-Yvette, France; Department of Developmental and Stem Cell Biology and CNRS UMR 3738, Institut Pasteur, 25 rue du Dr Roux, 75015 Paris, France.
3
Paris-Saclay Institute for Neuroscience, CNRS UMR9197 - Université Paris-Sud, Team Zebrafish Neurogenetics, Avenue de la Terrasse, Bldg 5, F-91198 Gif-sur-Yvette, France; Department of Developmental and Stem Cell Biology and CNRS UMR 3738, Institut Pasteur, 25 rue du Dr Roux, 75015 Paris, France. Electronic address: isabelle.foucher@pasteur.fr.
4
Paris-Saclay Institute for Neuroscience, CNRS UMR9197 - Université Paris-Sud, Team Zebrafish Neurogenetics, Avenue de la Terrasse, Bldg 5, F-91198 Gif-sur-Yvette, France; Department of Developmental and Stem Cell Biology and CNRS UMR 3738, Institut Pasteur, 25 rue du Dr Roux, 75015 Paris, France. Electronic address: laure.bally-cuif@pasteur.fr.

Abstract

Neurogenesis in the post-embryonic vertebrate brain varies in extent and efficiency between species and brain territories. Distinct neurogenesis modes may account for this diversity, and several neural progenitor subtypes, radial glial cells (RG) and neuroepithelial progenitors (NE), have been identified in the adult zebrafish brain. The neurogenic sequences issued from these progenitors, and their contribution to brain construction, remain incompletely understood. Here we use genetic tracing techniques based on conditional Cre recombination and Tet-On neuronal birthdating to unravel the neurogenic sequence operating from NE progenitors in the zebrafish post-embryonic optic tectum. We reveal that a subpopulation of her5-positive NE cells of the posterior midbrain layer stands at the top of a neurogenic hierarchy involving, in order, the amplification pool of the tectal proliferation zone (TPZ), followed by her4-positive RG cells with transient neurogenic activity. We further demonstrate that the adult her5-positive NE pool is issued in lineage from an identically located NE pool expressing the same gene in the embryonic neural tube. Finally, we show that these features are reminiscent of the neurogenic sequence and embryonic origin of the her9-positive progenitor NE pool involved in the construction of the lateral pallium at post-embryonic stages. Together, our results highlight the shared recruitment of an identical neurogenic strategy by two remote brain territories, where long-lasting NE pools serve both as a growth zone and as the life-long source of young neurogenic RG cells.

KEYWORDS:

Neuroepithelial progenitor; Optic tectum; Pallium; Post-embryonic neurogenesis; Radial glia; Zebrafish

PMID:
27693369
PMCID:
PMC5156517
DOI:
10.1016/j.ydbio.2016.09.022
[Indexed for MEDLINE]
Free PMC Article

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