Progression of interleukin-2 (IL-2)-dependent rat T cell lymphoma lines to IL-2-independent growth following activation of a gene (Gfi-1) encoding a novel zinc finger protein.

Molecular and Cellular Biology
C B GilksP N Tsichlis

Abstract

During progression of Moloney murine leukemia virus (Mo-MuLV)-induced rat T cell lymphomas, growth selection results in the expansion of cell clones carrying increasing numbers of integrated proviruses. These new provirus insertions reproducibly contribute to enhanced growth, allowing the emergence of cell clones from the initially heterogeneous population of tumor cells. The Mo-MuLV-induced rat T cell lymphoma lines 2780d and 5675d, which are dependent on interleukin-2 (IL-2) for growth in culture (IL-2d), were placed in IL-2-free medium to select for IL-2-independent (IL-2i) mutants. Southern blot analysis of genomic DNA from these mutants, which was hybridized to a Mo-MuLV long terminal repeat probe, revealed that all mutants carried new provirus insertions (from one to four new proviruses per cell line). A locus of integration identified through cloning of the single new provirus detected in one of the IL-2i mutants, 2780i.5, was found to be the target of provirus insertion in 1 additional IL-2i cell line of 24 tested. A full-length cDNA of a gene (growth factor independence-1 [Gfi-1]) activated by promoter insertion in the 2780i.5 cells was cloned and shown to encode a novel zinc finger protein. Gfi-1 is expressed at low l...Continue Reading

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