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Article Dans Une Revue European Journal of Immunology Année : 2010

Bcl11b represses a mature T-cell gene expression program in immature CD4(+)CD8(+) thymocytes

Résumé

Bcl11b is a transcription factor that, within the hematopoietic system, is expressed specifically in T cells. Although Bcl11b is required for T-cell differentiation in newborn Bcl11b-null mice, and for positive selection in the adult thymus of mice bearing a T-cell-targeted deletion, the gene network regulated by Bcl11b in T cells is unclear. We report herein that Bcl11b is a bifunctional transcriptional regulator, which is required for the correct expression of approximately 1000 genes in CD4(+)CD8(+)CD3(lo) double-positive (DP) thymocytes. Bcl11b-deficient DP cells displayed a gene expression program associated with mature CD4(+)CD8(-) and CD4(-)CD8(+) single-positive (SP) thymocytes, including upregulation of key transcriptional regulators, such as Zbtb7b and Runx3. Bcl11b interacted with regulatory regions of many dysregulated genes, suggesting a direct role in the transcriptional regulation of these genes. However, inappropriate expression of lineage-associated genes did not result in enhanced differentiation, as deletion of Bcl11b in DP cells prevented development of SP thymocytes, and that of canonical NKT cells. These data establish Bcl11b as a crucial transcriptional regulator in thymocytes, in which Bcl11b functions to prevent the premature expression of genes fundamental to the SP and NKT cell differentiation programs.

Dates et versions

hal-04009063 , version 1 (28-02-2023)

Identifiants

Citer

Philippe Kastner, Susan Chan, Walter Vogel, Ling-Juan Zhang, Acharawan Topark-Ngarm, et al.. Bcl11b represses a mature T-cell gene expression program in immature CD4(+)CD8(+) thymocytes. European Journal of Immunology, 2010, 40 (8), pp.2143-2154. ⟨10.1002/eji.200940258⟩. ⟨hal-04009063⟩
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