title: Excitatory projection neuron subtypes control the distribution of local inhibitory interneurons in the cerebral cortex.
abstract: In the mammalian cerebral cortex, the developmental events governing the integration of excitatory projection neurons and inhibitory interneurons into balanced local circuitry are poorly understood. We report that different subtypes of projection neurons uniquely and differentially determine the laminar distribution of cortical interneurons. We find that in Fezf2⁻/⁻ cortex, the exclusive absence of subcerebral projection neurons and their replacement by callosal projection neurons cause distinctly abnormal lamination of interneurons and altered GABAergic inhibition. In addition, experimental generation of either corticofugal neurons or callosal neurons below the cortex is sufficient to recruit cortical interneurons to these ectopic locations. Strikingly, the identity of the projection neurons generated, rather than strictly their birthdate, determines the specific types of interneurons recruited. These data demonstrate that in the neocortex individual populations of projection neurons cell-extrinsically control the laminar fate of interneurons and the assembly of local inhibitory circuitry.
authors.affiliation: Center for Regenerative Medicine and Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
authors.forename: Simona
authors.initials: S
authors.lastname: Lodato
authors.forename: Caroline
authors.initials: C
authors.lastname: Rouaux
authors.forename: Kathleen B
authors.initials: KB
authors.lastname: Quast
authors.forename: Chanati
authors.initials: C
authors.lastname: Jantrachotechatchawan
authors.forename: Michèle
authors.initials: M
authors.lastname: Studer
authors.forename: Takao K
authors.initials: TK
authors.lastname: Hensch
authors.forename: Paola
authors.initials: P
authors.lastname: Arlotta
mesh_terms: D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn; D002452:Cell Count; D002465:Cell Movement / Q000235:genetics; D002540:Cerebral Cortex / Q000166:cytology* / Q000254:growth & development*; D003337:Corpus Callosum / Q000166:cytology / Q000254:growth & development; D004268:DNA-Binding Proteins / Q000172:deficiency; D004558:Electric Stimulation; D018274:Electroporation / Q000379:methods; D004622:Embryo, Mammalian; D005260:Female; D007839:Functional Laterality / Q000235:genetics; D018507:Gene Expression Regulation, Developmental / Q000235:genetics / Q000502:physiology*; D005968:Glutamate Decarboxylase / Q000235:genetics; D049452:Green Fluorescent Proteins / Q000235:genetics; D007395:Interneurons / Q000502:physiology*; D008564:Membrane Potentials / Q000235:genetics; D051379:Mice; D008822:Mice, Transgenic; D009415:Nerve Net / Q000502:physiology*; D009419:Nerve Tissue Proteins / Q000172:deficiency / Q000235:genetics / Q000378:metabolism; D009433:Neural Inhibition / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D009474:Neurons / Q000145:classification / Q000502:physiology; D018408:Patch-Clamp Techniques; D011247:Pregnancy
chemical_list: D004268:DNA-Binding Proteins; D009419:Nerve Tissue Proteins; C412364:Zfp312 protein, mouse; D049452:Green Fluorescent Proteins; D005968:Glutamate Decarboxylase; C402565:glutamate decarboxylase 1