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Distinct Notch1 and BCL11B requirements mediate human γδ/αβ T cell development [miRNA BCL11B_ex vivo]

ABSTRACT: Notch-dependent BCL11B induction converts thymus seeding precursor cells into committed T cell progenitors that subsequently differentiate into T cells bearing either the γδ or αβ T cell receptor. In human, strong Notch activation favors γδ T cell development at the expense of αβ-lineage differentiation, but the underlying molecular mechanism has remained unclear. Therefore, we performed paired mRNA and miRNA profiling across 11 stages of human T cell development, including developing γδ T cells. We identify the miR-17-92 cluster as a direct Notch target and show that miR-17 promotes human TCRγδ T cell development by targeting BCL11B, a gene required for αβ but not for γδ T cell development. Thus, following its role as a licensing factor to induce BCL11B expression in early T cell precursors, Notch activation limits BCL11B expression through miR-17 until thymocytes have passed the β-selection checkpoint when Notch activation is turned off. Hereby Notch prevents premature BCL11B upregulation that is required for αβ-lineage differentiation and this results in preferential γδ-lineage differentiation. Our work unravels a dual role for Notch in controlling BCL11B expression during intrathymic differentiation and provides a unique resource for understanding the mRNA/miRNA interactions that control human T cell development. The expression of 756 miRNAs and 3 small RNA controls was determined using the Taqman stem-loop RT-qPCR method as previously described (Mets E. Leukemia. 2015, Mavrakis KJ. Nat Genet. 2011).

ORGANISM(S): Homo sapiens

PROVIDER: GSE129854 | GEO | 2020/05/26

REPOSITORIES: GEO

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Project description:CCCTC-binding factor (CTCF) regulates the 3D chromatin architecture by facilitating chromosomal loops. In addition to insulation of euchromatin from heterochromatin, CTCF is an important transcription factor and regulator of antigen receptor and T cell receptor recombination events. CTCF inactivating events have been found in human cancer, resulting in deregulation of global gene expression by altered methylated genomic states. In contrast to these studies, we here describe that inactivation of CTCF can drives subtle and local genomic effects that elevates oncogene expression levels from driving chromosomal rearrangements. For T cell acute lymphoblastic leukemia (T-ALL), heterozygous CTCF deletions or inactivating mutations are predominantly found in nearly 50 percent of t(5;14)(q35;q32.2) rearranged patients that couples the TLX3 oncogene in the vicinity of the BCL11B enhancer. This unique entity has been associated with γδ-lineage development. Functional CTCF loss results in diminished expression of the αβ-lineage commitment factor BCL11B from the non-rearranged allele, but unexpectedly drives higher levels of the TLX3 oncogene from the translocated allele. In line, Ctcf conditional knockout mice have reduced numbers of αβ T cells but increased numbers of γδ T cells, a phenotype identical to that of Bcl11b knockout mice and implying that CTCF is directly involved in the regulation of the BCL11B enhancer. We demonstrate that most TLX3-rearranged patients with heterozygous CTCF aberrations preserved single intervening CTCF bindings sites in the translocation breakpoint areas located in between the BCL11B enhancer and the TLX3 oncogene. These intervening CTCF sites insulate TLX3 from the enhancer by forming competitive loops with TLX3 regulatory sequences. Using reverse genetics, we provide evidence that heterozygous inactivation of CTCF diminishes competitive loop formation in favor of high-affinity TLX3 promoter loops to BCL11B enhancer sequences formed among multiple convergent CTCF binding sites. This boosts oncogene expression levels and leukemia burden in T-ALL patients.

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Distinct Notch1 and BCL11B requirements mediate human γδ/αβ T cell development [miRNA BCL11B_ex vivo]

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