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Innate versus adaptive lymphoid cell fate choice is controlled by the E-Id protein axis [ATAC-Seq]

ABSTRACT: The lymphoid branch of the immune defense is composed of innate and adaptive immune cells. Using multiple genetic strategies we demonstrate that in the thymus E2A and HEB act in synergy to establish T cell identity and to suppress the aberrant development of innate lymphoid cells that include ILC2 and LTi-like cells. We found that E2A and HEB induce T cell fate by activating the expression of an ensemble of genes encoding for proteins associated with Notch- and pre-TCR signaling and to promote TCRβ antigen receptor assembly. We show that E2A and HEB act in early T progenitors (ETPs) to establish and maintain a T-lineage specific enhancer repertoire, including regulatory elements associated with the Notch1/3 and Rag1/2 gene loci. Based on these and previous observations we propose that the E-Id protein axis specifies innate versus adaptive lymphoid cell fate.

ORGANISM(S): Mus musculus

PROVIDER: GSE95338 | GEO | 2017/06/01

SECONDARY ACCESSION(S): PRJNA376694

REPOSITORIES: GEO

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Innate versus adaptive lymphoid cell fate choice is controlled by the E-Id protein axis [RNA-Seq]

Project description:The lymphoid branch of the immune defense is composed of innate and adaptive immune cells. Using multiple genetic strategies we demonstrate that in the thymus E2A and HEB act in synergy to establish T cell identity and to suppress the aberrant development of innate lymphoid cells that include ILC2 and LTi-like cells. We found that E2A and HEB induce T cell fate by activating the expression of an ensemble of genes encoding for proteins associated with Notch- and pre-TCR signaling and to promote TCRβ antigen receptor assembly. We show that E2A and HEB act in early T progenitors (ETPs) to establish and maintain a T-lineage specific enhancer repertoire, including regulatory elements associated with the Notch1/3 and Rag1/2 gene loci. Based on these and previous observations we propose that the E-Id protein axis specifies innate versus adaptive lymphoid cell fate.

2017-06-01 | GSE95337 | GEO

Differential Expression of the Transcription Factor GATA3 Specifies Lineage and Functions of Innate Lymphoid Cells

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Expression data from WT, HEB-KO and E2A-KO LY6D- CLP cells

Project description:The E-protein transcription factors E2A and HEB play important roles at several stages of hematopoiesis. However, the exact mechanism for theire action and the main targets in the LY6D negative common lymphoid progentior (CLP) compartment remains unknown. By adressing this question, we will gain important infromation regarding the early events leading to B-cell specification. FACS sorted LY6D negative common lymphoid progenitors from WT, HEB-KO and E2A-KO mice were subjected to RNA extraction and hybridization on Affymetrix microarrays. At least two independent sorts were performed per genotype. During each sort, cells were pooled from several bone marrows.

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Genes regulated by HEB and E2A during DP stage of thymocyte development

Project description:To investigate gene targets of the E-proteins HEB and E2A during the CD4+CD8+ double positive (DP) stage of T cell development. We examined E-protein function by simultaneous removal of both HEB (Tcf12) and E2A (Tcfe2a) genes at the DP stage. This was done by crossing mice containing HEB floxed and E2A floxed alleles to a CD4Cre background (Tcf12f/fTcfe2af/fCD4Cre mice). Microarray analysis was used to compare gene expression in HEB and E2A double deficient DP thymocytes (Cre+) to Cre- control DP thymocytes. Keywords: genetic modification

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Project description:Innate lymphoid cells (ILC) are tissue-resident effector cells with important roles in tissue homeostasis, protective immunity and inflammatory disease. Current nomenclature divides ILC into subsets based on the expression of master transcription factors and effector cytokine programs. In mucosal barrier tissues, group 3 ILC (ILC3) have been defined by the expression of the master transcription factor RORgt. However, ILC3 can be further subdivided into two major subsets – natural cytotoxicity receptor-expressing (NCR+) ILC3 and lymphoid tissue inducer (LTi)-like ILC3 which share type 3 effector modules but also exhibit significant ontological, transcriptional, phenotypic and functional heterogeneity. In particular, LTi-like ILC3 exhibit effector functions not typically associated with other RORgt-expressing lymphocytes, provoking the hypothesis that other master transcription factors may contribute to LTi-like ILC3 biology. Here we identify Bcl6 as an LTi-like ILC3 associated transcription factor in both mice and humans. Deletion of Bcl6 led to dysregulation of the LTi-like ILC3 transcriptional program and changes to subset-specific phenotypic markers and effector functions. Strikingly, loss of Bcl6 enhanced expression of the type 3 effector cytokines IL-17A and IL-17F in LTi-like ILC3, which was found to be in part dependent upon the commensal microbiota. Together these findings implicate Bcl6 as an ILC3 subset-defining transcription factor and part of a network that confers phenotype and function on LTi-like ILC3. Our study further provides a missing link to redefine analogous immune modules in innate and adaptive lymphocyte responses.

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Expression data from WT, HEB-KO and E2A-KO LY6D- CLP cells

2011-11-22 | GSE27402 | GEO

PD-1 signaling in intestinal lymphoid tissue inducer cells facilitates gut homeostasis

Project description:PD-1/PD-L1 signaling play inhibiting role in CD4+ effector T cells. Innate lymphoid cells (ILCs) represent the innate counterparts of the CD4+ T helper cells, the role of PD-1/PD-L1 signaling on ILCs is still need more study. We found high PD-1 expression on Lymphoid tissue inducer (LTi) cells by experiment. RNA-sequencing analysis suggests different gene expression feature in the PD-1high and PD-1- LTi cells from Pdcd1hu/+ or Pdcd1hu/- mice. PD-1-expressing LTi are more prominent in cytokine production and Pdcd1 deficit could downregulate LTi cytokine production. In addition, metabolic pathways analysis showed the most dramatic downstream change of PD-1 signaling was from lipid metabolism-related genes. Thus, PD-1/PD-L1 signaling promotes LTi effector function and the mechanism may through regulating lipid metabolism. Meanwhile, the RNA-seq data of LTi cultured in presence or absence of palmitic acid also revealed the regulatory function of fatty acid oxidation on LTi. Meanwhile, the RNA-seq data of LTi cultured in presence or absence of palmitic acid also revealed the regulatory function of fatty acid oxidation on LTi.

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