ArticleJournal of virology1998
Functional analysis of ground squirrel hepatitis virus enhancer II.
Article in Journal of virology, 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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5 authors at 3 institutions in 1 country.
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Abstract
We have characterized a major regulatory element of ground squirrel hepatitis virus (GSHV) located within a 90-nucleotide fragment of the core promoter upstream sequences and have compared its organization to that of woodchuck hepatitis virus (WHV) enhancer II (We2). The GSHV element (Ge2) stimulates transcription from the viral core promoter and heterologous promoters in an orientation-independent manner but displays a lower level of activity than We2 in transient transfection assays in human hepatoma cells. The general organization of Ge2 into binding sites for the liver-enriched HNF-1 and HNF-4 proteins and for ubiquitous factors of the NF1 and Oct families was found to be mostly conserved with respect to the homologous We2 region. Accordingly, transactivation by HNF-1 and HNF-4 plays an essential role in the liver-specific transcriptional activity of both the GSHV and WHV core promoters. Distinctive features of the GSHV enhancer consist of its ability to bind C/EBP family factors in a central motif that overlaps with one of the two HNF-4 sites and its differential binding affinities for HNF-4.
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