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A novel type of regulatory element is required for promoter-specific activity of the PDGF-B intronic enhancer region.
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1998 (English)In: Growth Factors, ISSN 0897-7194, E-ISSN 1029-2292, Vol. 16, no 2, 137-51 p.Article in journal (Refereed) Published
Abstract [en]

We have previously described a non-classical, promoter-specific enhancer for the human Platelet-Derived Growth Factor B (PDGF-B) gene. In JEG-3 choriocarcinoma cells the activity of the enhancer depends upon co-operation with a sequence (the Enhancer-Dependent cis Co-activator "EDC" element) within the promoter. The PDGF-B enhancer fails to activate heterologous promoters, indicating that promoter-specificity depends on an element within the enhancer that can recognise a target sequence within the promoter. Here we identify a sequence within the enhancer of the PDGF-B gene which directs activation of the PDGF-B promoter by distal cis-acting elements. This specifies the wild-type PDGF-B promoter as the target for the enhancer and has been designated the EDC specificity element (EDCse). The cell-type specific nature of this interaction is extended by the observation that the EDCse is also dispensable for enhancer activity in breast-cancer cells (ZR-75). Concomitant to this observation, JEG-3 and ZR-75 cells differ in the binding of nuclear factors to the EDCse. We discuss the relevance of the EDC/EDCse system in regulation of gene expression.

Place, publisher, year, edition, pages
1998. Vol. 16, no 2, 137-51 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-161192PubMedID: 9932231OAI: oai:DiVA.org:uu-161192DiVA: diva2:455145
Available from: 2011-11-09 Created: 2011-11-08 Last updated: 2017-12-08

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Ullerås, E

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