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    An extended set of PRDM1/BLIMP1 target genes links binding motif type to dynamic repression.

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    Authors
    Doody, Gina M
    Care, Matthew A
    Burgoyne, Nicholas J
    Bradford, James R
    Bota, Maria
    Bonifer, Constanze
    Westhead, David R
    Tooze, Reuben M
    Affiliation
    Section of Experimental Haematology, Leeds Institute of Molecular Medicine, University of Leeds, Leeds LS9 7TF
    Issue Date
    2010-04-26
    
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    Abstract
    The transcriptional repressor B lymphocyte-induced maturation protein-1 (BLIMP1) regulates gene expression and cell fate. The DNA motif bound by BLIMP1 in vitro overlaps with that of interferon regulatory factors (IRFs), which respond to inflammatory/immune signals. At such sites, BLIMP1 and IRFs can antagonistically regulate promoter activity. In vitro motif selection predicts that only a subset of BLIMP1 or IRF sites is subject to antagonistic regulation, but the extent to which antagonism occurs is unknown, since an unbiased assessment of BLIMP1 occupancy in vivo is lacking. To address this, we identified an extended set of promoters occupied by BLIMP1. Motif discovery and enrichment analysis demonstrate that multiple motif variants are required to capture BLIMP1 binding specificity. These are differentially associated with CpG content, leading to the observation that BLIMP1 DNA-binding is methylation sensitive. In occupied promoters, only a subset of BLIMP1 motifs overlap with IRF motifs. Conversely, a distinct subset of IRF motifs is not enriched amongst occupied promoters. Genes linked to occupied promoters containing overlapping BLIMP1/IRF motifs (e.g. AIM2, SP110, BTN3A3) are shown to constitute a dynamic target set which is preferentially activated by BLIMP1 knock-down. These data confirm and extend the competitive model of BLIMP1 and IRF interaction.
    Citation
    An extended set of PRDM1/BLIMP1 target genes links binding motif type to dynamic repression. 2010: Nucleic Acids Res
    Journal
    Nucleic Acids Research
    URI
    http://hdl.handle.net/10541/109407
    DOI
    10.1093/nar/gkq268
    PubMed ID
    20421211
    Type
    Article
    Language
    en
    ISSN
    1362-4962
    ae974a485f413a2113503eed53cd6c53
    10.1093/nar/gkq268
    Scopus Count
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    All Paterson Institute for Cancer Research

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