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Critical Reviews™ in Eukaryotic Gene Expression
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ISSN Imprimir: 1045-4403
ISSN En Línea: 2162-6502

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Critical Reviews™ in Eukaryotic Gene Expression

DOI: 10.1615/CritRevEukarGeneExpr.v16.i1.30
pages 31-44

RUNX Expression and Function in Human B Cells

Hannah J. Whiteman
Department of Virology, Imperial College Faculty of Medicine, St. Mary's Campus, Norfolk Place, London W2 1PG, UK
Paul J. Farrell
Department of Virology, Imperial College Faculty of Medicine, St. Mary's Campus, Norfolk Place, London W2 1PG, UK

SINOPSIS

RUNX1 and RUNX3 are expressed at many stages of B-cell differentiation, suggesting that they play a role in the development and functions of this lineage. Transgenic mice lacking expression of RUNX1 or the RUNX protein-binding partner, CBFβ, have defective B-cell development, with differentiation blocked at an early stage. Specific knockout of RUNX1 in adult hematopoietic cells also caused a decrease in the number of mature B cells, supporting a role for RUNX1 in both developmental and adult hematopoiesis. Furthermore, RUNX proteins have been shown to regulate several B-cell-specific genes and play an important role in TGF-β-induced immunoglobulin class switching to IgA. The importance of RUNX1 in B-cell development is additionally demonstrated by its dysregulation in the t(12;21) translocation, which is the most frequent translocation found in acute lymphocytic leukemia. Epstein Barr virus immortalized human B lymphoblastoid cell lines express RUNX3, and cross-regulation of RUNX1 by RUNX3 occurs in these cells. Knockdown of RUNX3 in these cells induces RUNX1 expression and inhibits cell proliferation, directly showing that RUNX proteins can regulate B-cell growth.


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