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    Immunity. 2002 Feb;16(2):231-43.

    Deltex1 redirects lymphoid progenitors to the B cell lineage by antagonizing Notch1.

    Izon DJ, Aster JC, He Y, Weng A, Karnell FG, Patriub V, Xu L, Bakkour S, Rodriguez C, Allman D, Pear WS.

    Source

    Department of Pathology and Laboratory Medicine, University of Pennsylvania Medical Center, Philadelphia, PA 19104, USA.

    Abstract

    Notch1 signaling drives T cell development at the expense of B cell development from a common precursor, an effect that is dependent on a C-terminal Notch1 transcriptional activation domain. The function of Deltex1, initially identified as a positive modulator of Notch function in a genetic screen in Drosophila, is poorly understood. We now demonstrate that, in contrast to Notch1, enforced expression of Deltex1 in hematopoietic progenitors results in B cell development at the expense of T cell development in fetal thymic organ culture and in vivo. Consistent with these effects, Deltex1 antagonizes Notch1 signaling in transcriptional reporter assays by inhibiting coactivator recruitment. These data suggest that a balance of inductive Notch1 signals and inhibitory signals mediated through Deltex1 and other modulators regulate T-B lineage commitment.

    PMID:
    11869684
    [PubMed - indexed for MEDLINE]

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