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Transcription mapping of embryonic rat brain reveals EGR-1 induction in SOX2+ neural progenitor cells

Carter, David Allan, Rough, Kirsty and Wells, Timothy 2011. Transcription mapping of embryonic rat brain reveals EGR-1 induction in SOX2+ neural progenitor cells. Frontiers in Molecular Neuroscience 4 10.3389/fnmol.2011.00006

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Abstract

Neuronal expression of the early growth response-1 (EGR-1; NGFI-A/Zif268) transcription factor has been extensively studied in the adult mammalian brain and linked to aspects of mature physiological/behavioral function. In contrast, this factor has not been studied in detail in the embryonic brain. Here, we used a fluorescent protein-encoding Egr-1 transgene to map the cellular distribution of Egr-1 transcription in embryonic rat brain. We identified a novel, widely distributed population of GFP+ cells, characterized as a precursor/stem cell phenotype by co-localization with SOX2/nestin/vimentin/S-100β and exclusion from other known cellular markers including DCX/BLBP/TBR2/NURR1. At both E18 and E20, these cells were located across the developing brain but concentrated in the subplate and intermediate zones. The transgene was also highly expressed in developing (NeuN+) striatal neurons. The authentic expression pattern that we observed for the rEgr-1 transgene sequence indicates that restriction to neuronal/precursor cells is largely driven by proximal 5′ sequence. Deletion of conserved Egr-1 silencer (neuron restrictive silencer factor) elements did not markedly alter transcriptional activity in transfected cells; this is consistent with a dominant role for positive factors in the control of cell-specific Egr-1 expression. Induction of Egr-1 in a population of SOX2+ cells indicates a co-incidence of extrinsic (EGR-1) and cell-intrinsic (SOX2) cellular signals that may form a novel level of progenitor cell regulation. The wide distribution of EGR-1 signaling in SOX2+ cells suggests an organizational role during late embryonic brain development.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > Q Science (General)
Uncontrolled Keywords: EGR-1, neural progenitor cells, SOX2, transgenic, transcription factor, green fluorescent protein
ISSN: 1662-5099
Last Modified: 04 Jun 2017 04:12
URI: http://orca.cf.ac.uk/id/eprint/34734

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