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Prepublished online as a Blood First Edition Paper on February 6, 2003; DOI 10.1182/blood-2002-08-2579. This Article Full Text Full Text (PDF) All Versions of this Article: 2002-08-2579v1 101/11/4492    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Yang, X. O. Articles by Willerford, D. M. Search for Related Content PubMed PubMed Citation Articles by Yang, X. O. Articles by Willerford, D. M. Related Collections Immunobiology Gene Expression Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 June 2003, Vol. 101, No. 11, pp. 4492-4499 IMMUNOBIOLOGY Regulation of T-cell receptor D1 promoter by KLF5 through reiterated GC-rich motifs Xuexian O. Yang, Raymond T. Doty, Justin S. Hicks, and Dennis M. Willerford From the Departments of Medicine and Immunology, University of Washington, Seattle. Rearrangement of T-cell receptor (TCR) and immunoglobulin genes by a common V(D)J recombination machinery is regulated by developmentally specific chromatin changes at the target locus, a process associated with transcription. At the TCR locus, the E enhancer and the D1 promoter regulate germline transcription originating near the TCR D1 gene segment. The D1 promoter contains 3 GC-rich motifs that bind a common set of nuclear proteins from pro–T-cell lines. Mutations that diminish the binding of nuclear proteins also diminish the activity of the D1 promoter in transcriptional reporter assays. Using a yeast one-hybrid approach, 3 Krüppel-like factors—KLF3, KLF5, and KLF6—and a novel zinc finger protein were identified in a thymus library, all of which bound the GC-rich motif in a sequence-specific manner. Of these genes, KLF5 mRNA was expressed in a restricted manner in lymphoid cells and tissues, with highest expression in pro–T-cell lines and Rag-deficient thymocytes. Antibody supershift studies and chromatin immunoprecipitation assay confirmed that KLF5 bound the D1 promoter. In reporter gene assays, KLF5 but not KLF6 efficiently transactivated the D1 promoter, whereas a dominant-negative KLF5 construct inhibited reporter expression. These data suggest that reiterated GC motifs contribute to germline TCR transcription through binding of KLF5 and other Krüppel family members and that restricted expression of KLF5 may contribute to lineage-specific regulation of germline TCR transcription. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: N. Zhu, L. Gu, H. W. Findley, C. Chen, J.-T. Dong, L. Yang, and M. Zhou KLF5 Interacts with p53 in Regulating Survivin Expression in Acute Lymphoblastic Leukemia J. Biol. Chem., May 26, 2006; 281(21): 14711 - 14718. [Abstract] [Full Text] [PDF] M. C. van Zelm, M. van der Burg, D. de Ridder, B. H. Barendregt, E. F. E. de Haas, M. J. T. Reinders, A. C. Lankester, T. Revesz, F. J. T. Staal, and J. J. M. van Dongen Ig Gene Rearrangement Steps Are Initiated in Early Human Precursor B Cell Subsets and Correlate with Specific Transcription Factor Expression J. Immunol., November 1, 2005; 175(9): 5912 - 5922. [Abstract] [Full Text] [PDF] R. Rangel, M. R. McKeller, J. C. Sims-Mourtada, C. Kashi, K. Cain, E. D. Wieder, J. J. Molldrem, L. V. Pham, R. J. Ford, P. Yotnda, et al. Assembly of the {kappa} PreB Receptor Requires a V{kappa}-like Protein Encoded by a Germline Transcript J. Biol. Chem., May 6, 2005; 280(18): 17807 - 17814. [Abstract] [Full Text] [PDF]

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