title: Genetic dissection of Gata2 selective functions during specification of V2 interneurons in the developing spinal cord.
abstract: 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 (TFs) 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 TFs 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.
authors.affiliation: CRICM, UPMC/Inserm UMR_S 975; CNRS UMR 7225, Laboratoire de Biotechnologie et Biotherapie, Hôpital Pitié-Salpêtrière, CERVI, 83 bd de l'Hôpital, F-75013, Paris, France.|Laboratory of Neural Differentiation (NEDI), Université Catholique de Louvain (UCL), Institute of Neuroscience (IoNS), box UCL-5511, 55 Avenue Hippocrate, B-1200 Brussels, Belgium.
authors.forename: Cédric
authors.initials: C
authors.lastname: Francius
authors.affiliation: CRICM, UPMC/Inserm UMR_S 975; CNRS UMR 7225, Laboratoire de Biotechnologie et Biotherapie, Hôpital Pitié-Salpêtrière, CERVI, 83 bd de l'Hôpital, F-75013, Paris, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Ravassard
authors.affiliation: Laboratory of Neural Differentiation (NEDI), Université Catholique de Louvain (UCL), Institute of Neuroscience (IoNS), box UCL-5511, 55 Avenue Hippocrate, B-1200 Brussels, Belgium.
authors.forename: María
authors.initials: M
authors.lastname: Hidalgo-Figueroa
authors.affiliation: CRICM, UPMC/Inserm UMR_S 975; CNRS UMR 7225, Laboratoire de Biotechnologie et Biotherapie, Hôpital Pitié-Salpêtrière, CERVI, 83 bd de l'Hôpital, F-75013, Paris, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Mallet
authors.affiliation: Laboratory of Neural Differentiation (NEDI), Université Catholique de Louvain (UCL), Institute of Neuroscience (IoNS), box UCL-5511, 55 Avenue Hippocrate, B-1200 Brussels, Belgium.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Clotman
authors.affiliation: CRICM, UPMC/Inserm UMR_S 975; CNRS UMR 7225, Laboratoire de Biotechnologie et Biotherapie, Hôpital Pitié-Salpêtrière, CERVI, 83 bd de l'Hôpital, F-75013, Paris, France.|Inserm U676, Hôpital Robert Debré, 48 bd Serurier, F-75019, Paris, France.
authors.forename: Jeannette
authors.initials: J
authors.lastname: Nardelli
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D030161:Avian Proteins / Q000378:metabolism*; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D002135:Calcium-Binding Proteins; D002642:Chick Embryo; D005136:Eye Proteins / Q000235:genetics / Q000378:metabolism; D051858:Forkhead Transcription Factors / Q000378:metabolism; D050989:GATA2 Transcription Factor / Q000235:genetics / Q000378:metabolism*; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D007395:Interneurons / Q000166:cytology / Q000502:physiology*; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D018345:Mice, Knockout; D008822:Mice, Transgenic; D009046:Motor Neurons / Q000166:cytology / Q000502:physiology; D055495:Neurogenesis / Q000502:physiology; D000071841:PAX6 Transcription Factor; D051761:Paired Box Transcription Factors / Q000235:genetics / Q000378:metabolism; D022661:RNA, Untranslated / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D013116:Spinal Cord / Q000166:cytology / Q000196:embryology* / Q000502:physiology*; D014157:Transcription Factors / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D030161:Avian Proteins; D051792:Basic Helix-Loop-Helix Proteins; D002135:Calcium-Binding Proteins; D005136:Eye Proteins; D051858:Forkhead Transcription Factors; D050989:GATA2 Transcription Factor; D018398:Homeodomain Proteins; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D000071841:PAX6 Transcription Factor; D051761:Paired Box Transcription Factors; D022661:RNA, Untranslated; D012097:Repressor Proteins; D014157:Transcription Factors; D016212:Transforming Growth Factor beta; C499317:Ascl1 protein, mouse; C519665:DLL4 protein, mouse; C494712:Gata2 protein, mouse; C110853:Gt(ROSA)26Sor non-coding RNA, mouse; C501599:Irx3 protein, mouse; C491328:Nkx6-1 protein, mouse; C000605732:Pax6 protein, mouse; C088975:Vsx2 protein, mouse
keywords: Gata2; V2 interneurons; chick; mouse; neuronal specification; spinal cord; transcription factors