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    Nat Genet. 2002 Feb;30(2):158-66. Epub 2002 Jan 2.

    JunB can substitute for Jun in mouse development and cell proliferation.

    Passegué E, Jochum W, Behrens A, Ricci R, Wagner EF.

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    Research Institute of Molecular Pathology, Dr. Bohr-Gasse 7, A-1030 Vienna, Austria.

    Abstract

    The Jun and JunB components of the AP-1 transcription factor are known to have antagonistic functions. Here we show, by a knock-in strategy and a transgenic complementation approach, that Junb can substitute for absence of Jun during mouse development. Junb can rescue both liver and cardiac defects in Jun-null mice in a manner dependent on gene dosage. JunB restores the expression of genes regulated by Jun/Fos, but not those regulated by Jun/ATF, thereby rescuing Jun-dependent defects in vivo as well as in primary fibroblasts and fetal hepatoblasts in vitro. Thus, the transcriptionally less active JunB has the potential to substitute for Jun, indicating that the spatial and temporal regulation of expression of the transcription factor AP-1 may be more important than the coding sequence of its components.

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    PMID:
    11818961
    [PubMed - indexed for MEDLINE]

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