title: The germinal zones of the basal ganglia but not the septum generate GABAergic interneurons for the cortex.
abstract: Cortical interneurons originate from subpallial precursors and migrate into the cortex during development. Using genetic lineage tracing in transgenic mice we examine the contribution of two germinal zones, the septum and the lateral ganglionic eminence/caudal ganglionic eminence (LGE/CGE) to interneurons of the cortex. We find that the septal neuroepithelium does not generate interneurons for the neocortex. There is, however, clear migration of cells from the LGE/CGE to the cortex. Comparison of the dynamics of cortical colonization by the two major cohorts of interneurons originating in the medial ganglionic eminence (MGE) and the LGE/CGE has shown differences in the timing of migration and initial route of entry into the cortex. LGE/CGE-derived interneurons enter the cortex later than the MGE-derived ones. They invade the cortex through the subventricular/intermediate zone route and only later disperse within the cortical plate and the marginal zone. During the first postnatal week MGE interneurons move extensively to acquire their laminar position within the cortical plate whereas LGE/CGE-derived cells remain largely within the upper layers of the cortex. The two populations intermingle in the adult cortex but have distinct neurochemical properties and different overall distributions. LGE/CGE-derived interneurons account for one third of the total GABAergic interneuron population in the adult cortex.
authors.affiliation: Wolfson Institute for Biomedical Research and Department of Cell and Developmental Biology, University College London, London, United Kingdom.
authors.forename: Anna N
authors.initials: AN
authors.lastname: Rubin
authors.forename: Fabienne
authors.initials: F
authors.lastname: Alfonsi
authors.forename: Michael P
authors.initials: MP
authors.lastname: Humphreys
authors.forename: Christina K P
authors.initials: CK
authors.lastname: Choi
authors.forename: Susana F
authors.initials: SF
authors.lastname: Rocha
authors.forename: Nicoletta
authors.initials: N
authors.lastname: Kessaris
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001479:Basal Ganglia / Q000166:cytology*; D002465:Cell Movement / Q000235:genetics / Q000502:physiology*; D002540:Cerebral Cortex / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D004622:Embryo, Mammalian; D018507:Gene Expression Regulation, Developmental / Q000235:genetics / Q000502:physiology; D049452:Green Fluorescent Proteins / Q000235:genetics; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D007395:Interneurons / Q000502:physiology*; D060850:LIM-Homeodomain Proteins; D008164:Luminescent Proteins / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism; D009687:Nuclear Proteins / Q000235:genetics; D011506:Proteins / Q000235:genetics; D022661:RNA, Untranslated; D020665:Septum of Brain / Q000166:cytology*; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
chemical_list: C088334:Distal-less homeobox proteins; C110853:Gt(ROSA)26Sor non-coding RNA, mouse; D018398:Homeodomain Proteins; C498504:LHX6 protein, mouse; D060850:LIM-Homeodomain Proteins; D008164:Luminescent Proteins; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D011506:Proteins; D022661:RNA, Untranslated; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors; C100431:Zic4 protein, mouse; D049452:Green Fluorescent Proteins; D005680:gamma-Aminobutyric Acid
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