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. 1996 Oct 15;93(21):11933–11938. doi: 10.1073/pnas.93.21.11933

Regulation of striatal D1A dopamine receptor gene transcription by Brn-4.

H Okazawa 1, I Imafuku 1, M T Minowa 1, I Kanazawa 1, H Hamada 1, M M Mouradian 1
PMCID: PMC38161  PMID: 8876240

Abstract

Brn-4 is a member of the POU transcription factor family and is expressed in the central nervous system. In this study, we addressed whether Brn-4 regulates expression of the D1A dopamine receptor gene. We found a functional Brn-4 responsive element in the intron of this gene by means of cotransfection chloramphenical acetyltransferase assays. This region contains two consensus sequences for binding of POU factors. Gel mobility-shift assays using glutathione S-transferase-Brn-4 fusion protein indicated that Brn-4 binds to these sequences. Both these sites are essential for transactivation by Brn-4 because deletion of either significantly reduced this enhancer activity. In situ hybridization revealed colocalization of Brn-4 and D1A mRNAs at the level of a single neuron in the rat striatum where this dopamine receptor is most abundantly expressed. Gel mobility-supershift assay using rat striatal nuclear extract and Brn-4 antibody confirmed the presence of Brn-4 in this brain region and its ability to bind to its consensus sequences in the D1A gene. These data suggest a functional role for Brn-4 in the expression of the D1A dopamine receptor gene both in vitro and in vivo.

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