Document Detail


Genetic dissection of Gata2 selective functions during specification of V2 interneurons in the developing spinal cord.
MedLine Citation:
PMID:  25369423     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Motor activities are controlled by neural networks in the ventral spinal cord and consist in motor neurons and a set of distinct cardinal classes of spinal interneurons. These interneurons arise from distinct progenitor domains (p0-p3) delineated according to a transcriptional code. Neural progenitors of each domain express a unique combination of transcription factors that largely contribute to determine the fate of four classes of interneurons (V0-V3) and motor neurons. In p2 domain, at least four subtypes of interneurons namely V2a, V2b, V2c and Pax6(+) V2 are generated. Although genetic and molecular mechanisms that specify V2a and V2b are dependent on complex interplay between several transcription factors including Nkx6.1, Irx3, Gata2, Foxn4 and Ascl1, and signaling pathways such as Notch and TGF-β, the sequence order of the activation of these regulators and their respective contribution are not completely elucidated yet. Here we provide evidence by loss- or gain-of-function experiments that Gata2 is necessary for the normal development of both V2a and V2b neurons. We demonstrate that Nkx6.1 and Dll4 positively regulate the activation of Gata2 and Foxn4 in p2 progenitors. Gata2 also participates in the maintenance of p2 domain by repressing motor neuron differentiation and exerting a feedback control on patterning genes. Finally, Gata2 promotes the selective activation of V2b program at the expense of V2a fate. Thus our results provide new insights on the hierarchy and complex interactions between regulators of V2 genetic program. © 2014 Wiley Periodicals, Inc. Develop Neurobiol, 2014.
Authors:
Cédric Francius; Philippe Ravassard; María Hidalgo-Figueroa; Jacques Mallet; Frédéric Clotman; Jeannette Nardelli
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-4
Journal Detail:
Title:  Developmental neurobiology     Volume:  -     ISSN:  1932-846X     ISO Abbreviation:  Dev Neurobiol     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-4     Completed Date:  -     Revised Date:  2014-11-5    
Medline Journal Info:
Nlm Unique ID:  101300215     Medline TA:  Dev Neurobiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Wiley Periodicals, Inc., a Wiley company.
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