Mechanisms of autoimmune disease risk in IL2/IL2RA-dependent immune tolerance

IL2/IL2RA依赖性免疫耐受中自身免疫性疾病风险的机制

• 批准号: 10553203
• 负责人: Daniel J Campbell
• 金额: $ 75.42万
• 依托单位: CHILDREN'S HOSP OF PHILADELPHIA
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-02-23 至 2026-01-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10553203
• 关键词: 3-Dimensional; ATAC-seq; Affinity; Alleles; Animals; Antibodies; Architecture; Autoimmune; Autoimmune Diseases; Autoimmune Process; B-Lymphocytes; CD8-Positive T-Lymphocytes; CRISPR/Cas technology; Chromatin; Clinical; Complex; Cytokine Receptors; DNA; Development; Disease; Disease susceptibility; Distant; Dose; Elements; Engineering; Enhancers; Epigenetic Process; Equilibrium; Extrinsic asthma; Gene Expression; Genes; Genetic; Genetic Enhancer Element; Genetic Polymorphism; Genetic Transcription; Genetic Variation; Genomics; Graft Rejection; Homeostasis; Hormones; Human; Human Genetics; IL2 gene; IL2RA gene; Immune; Immune Tolerance; Immune response; Immunity; Infection; Inflammation; Inflammatory; Inflammatory Bowel Diseases; Insulin-Dependent Diabetes Mellitus; Intercistronic Region; Interleukin 2 Receptor; Interleukin-2; Knowledge; Link; Maps; Measures; Mediating; Modeling; Molecular; Mus; Nucleic Acid Regulatory Sequences; Population; Predisposition; Process; Recombinants; Regulator Genes; Regulatory Element; Regulatory T-Lymphocyte; Reporter; Research Institute; Role; SNP genotyping; Self Tolerance; Single Nucleotide Polymorphism; Surveys; System; Systemic Lupus Erythematosus; T cell differentiation; T cell response; T-Cell Activation; T-Lymphocyte; Testing; Untranslated RNA; Validation; Variant; autoinflammatory diseases; biobank; cytokine; design; disorder risk; epigenomics; genetic association; genetic variant; genome editing; genome wide association study; genome-wide; human disease; human subject; immune function; in vivo; insight; isoimmunity; novel; novel therapeutic intervention; organ transplant rejection; pathogen; promoter; receptor; response; risk variant; tool; trait

Project Summary Interleukin-2 is a potent T cell growth factor with crucial roles in both immunity and self-tolerance. Genome-wide association studies (GWAS) in humans have shown that genetic variation at the IL2 and IL2RA loci influence susceptibility to multiple immune-mediated diseases including allergic asthma, systemic lupus erythematosus, and inflammatory bowel disease (IBD), identifying this as a key molecular axis that controls immune activity. However, mechanistic basis of disease risk for these polymorphisms is poorly understood. We have new evidence that the cis-regulatory architectures of IL2 and IL2RA extend much further from the gene than previously appreciated, encompassing regions harboring known disease-associated variants, and we hypothesize that polymorphisms within these elements control the level and timing of IL-2 and IL-2RA expression to control the balance of tolerance vs. inflammation. In this application, we propose a comprehensive screen for potential cis-regulatory elements that interact with the IL2 and IL2RA genes using state-of-the-art epigenomic approaches like ATAC-seq and Capture-C-seq. We will establish how these elements contribute to IL2 and IL2RA gene expression using powerful, CRISPR/CAS9-based genome editing approaches. To study the impact of disease-associated genetic variation at these regulatory elements on immune function in in vivo systems, we will analyze the responses of genetically characterized subjects curated from the Benaroya Research Institute biorepository, and create mice in which orthologous murine Il2 and Il2ra enhancer sequences have been replaced with human risk alleles, assessing the disease susceptibility in models of allergic asthma, SLE and IBD. Our studies will provide comprehensive maps of the transcriptional architecture of IL2 and IL2RA, insights into the molecular basis for the genetic association of IL2 and IL2RA with autoimmune disease, and may guide the design of new approaches for the treatment of organ transplant rejection and inflammatory disease.

项目概要 Interleukin-2 是一种有效的 T 细胞生长因子，在免疫和自我耐受中发挥着至关重要的作用。全基因组 人类关联研究 (GWAS) 表明，IL2 和 IL2RA 位点的遗传变异影响 易患多种免疫介导的疾病，包括过敏性哮喘、系统性红斑狼疮、 和炎症性肠病（IBD），将其确定为控制免疫活动的关键分子轴。 然而，人们对这些多态性疾病风险的机制基础知之甚少。我们有新的 有证据表明 IL2 和 IL2RA 的顺式调控结构比基因延伸得更远 先前认识到，涵盖含有已知疾病相关变异的区域，并且我们 假设这些元件内的多态性控制 IL-2 和 IL-2RA 表达的水平和时间 控制耐受性与炎症的平衡。在此应用中，我们提出了一个全面的屏幕 使用最先进的表观基因组技术与 IL2 和 IL2RA 基因相互作用的潜在顺式调控元件 ATAC-seq 和 Capture-C-seq 等方法。我们将确定这些元素如何促进 IL2 和 使用基于 CRISPR/CAS9 的强大基因组编辑方法进行 IL2RA 基因表达。研究影响 这些调节元件对体内系统免疫功能的疾病相关遗传变异，我们 将分析贝纳罗亚研究所策划的基因特征受试者的反应 生物储存库，并创建小鼠，其中直系同源小鼠 Il2 和 Il2ra 增强子序列已被 替换为人类风险等位基因，评估过敏性哮喘、SLE 和 IBD 模型的疾病易感性。 我们的研究将提供 IL2 和 IL2RA 转录结构的全面图谱，深入了解 IL2 和 IL2RA 与自身免疫性疾病遗传关联的分子基础，并可能指导 设计治疗器官移植排斥和炎症性疾病的新方法。