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• W2146784802 endingPage "660" @default.
• W2146784802 startingPage "648" @default.
• W2146784802 abstract "A goal of this study was to use recombinant adenovirus (AdV) to ectopically express Emx2 in the embryonic neocortex as a gain-of-function approach to study its role in the area-specific targeting of thalamocortical axons (TCAs), using the rat as a model. First, we cloned the cDNA for the full-length coding region of rat Emx2, a homologue of Drosophila empty spiracles. We also used this sequence to define the full-length coding region of mouse Emx2 from genomic DNA. Our analysis of Emx2 expression shows that in rat, as reported in mouse, Emx2 is expressed in high caudal to low rostral, and high medial to low lateral, gradients across the cortex throughout cortical neurogenesis, and expression is primarily restricted to progenitors in the neuroepithelium. We also carried out an analysis of the distribution of cells infected with a replication defective recombinant type 5 adenovirus (AdV) containing a CAG/LacZ expression construct, following an injection into the lateral ventricle of the cerebral hemisphere at different stages of embryonic cortical neurogenesis. AdV-infected cells are broadly distributed tangentially, but their laminar distribution is differentially restricted and reflects the temporal sequence of generation of cortical neurons. This finding indicates that the AdV predominantly infects progenitors in the ventricular zone, which leads to a preferential labeling of their immediate progeny, and infects cells that have recently become postmitotic and have yet to move far from the ventricular surface. We then show that AdV-mediated ectopic Emx2 expression results in aberrant intracortical pathfinding and areal targeting of TCAs from the dorsal lateral geniculate nucleus. These findings indicate that EMX2 imparts positional information normally associated with caudal cortical areas, such as the primary visual area, that influences the area-specific targeting of TCAs. These results are consistent with a role for EMX2 in areal specification of the neocortex as suggested by recent analyses of Emx2 null mutants." @default.
• W2146784802 created "2016-06-24" @default.
• W2146784802 creator A5037787512 @default.
• W2146784802 date "2003-06-01" @default.
• W2146784802 modified "2023-10-17" @default.
• W2146784802 title "Cloning and Cortical Expression of Rat Emx2 and Adenovirus-mediated Overexpression to Assess its Regulation of Area-specific Targeting of Thalamocortical Axons" @default.
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• W2146784802 doi "https://doi.org/10.1093/cercor/13.6.648" @default.
• W2146784802 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12764041" @default.
• W2146784802 hasPublicationYear "2003" @default.
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