Abstract
PRDI-BF1, the human ortholog of mouse Blimp-1, is a DNA-binding protein involved in postinduction repression of interferon-β gene transcription in response to viral infection. PRDI-BF1 also has an essential function in driving terminal differentiation of B lymphocytes and therein silences multiple genes. Here we show PRDI-BF1 assembles silent chromatin over the interferon-β promoter in the osteosarcoma cell line U2OS through recruitment of the histone H3 lysine methyltransferase G9a. G9a is recruited only when in a complex with PRDI-BF1. G9a catalytic activity is required for the accumulation of methylated histone H3 and transcriptional silencing mediated by PRDI-BF1 in vivo. This establishes a mechanism for the recruitment of G9a, the main mammalian euchromatic methyltransferase, and defines nonembryonic targets of G9a.
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Acknowledgements
Supported in part by the National Institutes of Health (CA80990), the American Cancer Society (ACS-IRG 032) and the Molecular Biology Core Facility and Molecular Imaging Core Facility at the H. Lee Moffitt Cancer Center and Research Institute.
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Győry, I., Wu, J., Fejér, G. et al. PRDI-BF1 recruits the histone H3 methyltransferase G9a in transcriptional silencing. Nat Immunol 5, 299–308 (2004). https://doi.org/10.1038/ni1046
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DOI: https://doi.org/10.1038/ni1046
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