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    Science. 2008 Aug 1;321(5889):686-91. Epub 2008 Jul 10.

    Regulation of CD45 alternative splicing by heterogeneous ribonucleoprotein, hnRNPLL.

    Oberdoerffer S, Moita LF, Neems D, Freitas RP, Hacohen N, Rao A.

    Source

    Department of Pathology, Immune Disease Institute, Harvard Medical School, Boston, MA 02115, USA.

    Abstract

    The transition from naïve to activated T cells is marked by alternative splicing of pre-mRNA encoding the transmembrane phosphatase CD45. Using a short hairpin RNA interference screen, we identified heterogeneous ribonucleoprotein L-like (hnRNPLL) as a critical inducible regulator of CD45 alternative splicing. HnRNPLL was up-regulated in stimulated T cells, bound CD45 transcripts, and was both necessary and sufficient for CD45 alternative splicing. Depletion or overexpression of hnRNPLL in B and T cell lines and primary T cells resulted in reciprocal alteration of CD45RA and RO expression. Exon array analysis suggested that hnRNPLL acts as a global regulator of alternative splicing in activated T cells. Induction of hnRNPLL during hematopoietic cell activation and differentiation may allow cells to rapidly shift their transcriptomes to favor proliferation and inhibit cell death.

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    PMID:
    18669861
    [PubMed - indexed for MEDLINE]
    PMCID: PMC2791692
    Free PMC Article

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