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- W2034433166 abstract "VDJ recombination of T cell receptor and immunoglobulin loci occurs in immature lymphoid cells. Although the molecular mechanisms of DNA cleavage and ligation have become more clear, it is not understood what controls which target loci undergo rearrangement. In interleukin 7 receptor (IL-7R)α−/− murine thymocytes, it has been shown that rearrangement of the T cell receptor (TCR)-γ locus is virtually abrogated, whereas other rearranging loci are less severely affected. By examining different strains of mice with targeted mutations, we now observe that the signaling pathway leading from IL-7Rα to rearrangement of the TCR-γ locus requires the γc receptor chain and the γc-associated Janus kinase Jak3. Production of sterile transcripts from the TCR-γ locus, a process that generally precedes rearrangement of a locus, was greatly repressed in IL-7Rα−/− thymocytes. The repressed transcription was not due to a lack in transcription factors since the three transcription factors known to regulate this locus were readily detected in IL-7Rα−/− thymocytes. Instead, the TCR-γ locus was shown to be methylated in IL-7Rα−/− thymocytes. Treatment of IL-7Rα−/− precursor T cells with the specific histone deacetylase inhibitor trichostatin A released the block of TCR-γ gene rearrangement. This data supports the model that IL-7R promotes TCR-γ gene rearrangement by regulating accessibility of the locus via demethylation and histone acetylation of the locus." @default.
- W2034433166 created "2016-06-24" @default.
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- W2034433166 date "1998-12-21" @default.
- W2034433166 modified "2023-09-30" @default.
- W2034433166 title "Interleukin 7 Receptor Control of T Cell Receptor γ Gene Rearrangement: Role of Receptor-associated Chains and Locus Accessibility" @default.
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- W2034433166 doi "https://doi.org/10.1084/jem.188.12.2233" @default.
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