Linked Life Data

20846942

Source:http://linkedlifedata.com/resource/pubmed/id/20846942

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pubmed-article:20846942pubmed:abstractTextInterferon regulatory factor-1 (IRF-1), a transcription regulator involved both in inducing and in mediating the effects of interferon, is encoded by a highly polymorphic gene in different ethnic populations. Some of these genetic variations have been described to be associated to disease traits in hepatitis C virus and in human immunodeficiency virus infection, including one single-nucleotide polymorphism rs2549009 within the promoter region. This study aimed at investigating the functional relevance of rs2549009 on IRF-1 transcriptional activity in peripheral blood mononuclear cells in its natural genomic environment. Haplotype-specific chromatin immunoprecipitation using antibodies directed against both the transcriptionally inactive and active RNA polymerase II (RNAPII) and allele-specific transcript quantification techniques were applied to ex vivo-derived samples from healthy heterozygous donors. Inactive serine 5 phosphorylated RNAPII was found to be preferentially bound to the rs2549009 A allele in all donors investigated. Active serine 2 phosphorylated (ser2-P) RNAPII, in contrast, was found to be precipitable, depending on the donor, preferentially either with the A or the G promoter variants or without any preference. The ratio of rs2549009 A/G promoter variants engaged by ser2-P RNAPII was closely related to the relative frequency of the respective IRF-1 transcripts, and relative allelic expression was found to be associated to total IRF-1 gene expression. These results provide evidence for a bidirectional IRF-1 gene expression imbalance that appears not to be solely controlled by rs2549009 in cis and may rely on a yet unidentified variant or haplotype or on environmental control in trans.lld:pubmed
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pubmed-article:20846942pubmed:authorpubmed-author:MihmSabineSlld:pubmed
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pubmed-article:20846942pubmed:year2010lld:pubmed
pubmed-article:20846942pubmed:articleTitleFunctional relevance of the IRF-1 promoter polymorphism rs2549009 on transcriptional activity in a native genomic environment.lld:pubmed
pubmed-article:20846942pubmed:affiliationDepartment of Gastroenterology and Endocrinology, University Medical Center Goettingen, Georg-August-Universitaet, Robert-Koch-Strasse 40, Goettingen, Germany.lld:pubmed
pubmed-article:20846942pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20846942pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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