Studies of Antibody Diversity and Genome Stability: Regulation of Activation-Indu

抗体多样性和基因组稳定性的研究：激活诱导的调节

• 批准号: 8409854
• 负责人: Yee Ling Wu
• 金额: $ 0.79万
• 依托单位: MEDICAL RES COUNCIL LAB OF MOLEC BIOL
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-11-24 至 2013-11-23
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8409854
• 关键词: Address; Antibodies; Antibody Affinity; Antibody Diversity; Antigens; B-Lymphocytes; Biochemical; Cancer Etiology; Cell Nucleus; Cell physiology; Cells; Chromatin; Chromosomal translocation; Co-Immunoprecipitations; Complex; Coupled; DNA; DNA Sequence; DNA repair protein; Data; Deamination; Deoxycytidine; Disease; Embryo; Ensure; Enzyme Activation; Enzymes; Equilibrium; Event; Fellowship; Gene Conversion; Gene Expression; Generation of Antibody Diversity; Generations; Genes; Genetic Transcription; Genome; Genome Stability; Genomic Instability; Genomics; Goals; Hereditary Disease; Immune; Immunoglobulin Class Switching; Immunoglobulin Constant Region; Immunoglobulin Somatic Hypermutation; Immunoglobulin Switch Recombination; Immunoglobulins; Immunologics; Immunoprecipitation; Induced Mutation; Infection; Knockout Mice; Knowledge; Lesion; Malignant Neoplasms; Mass Spectrum Analysis; Mediating; Microbe; Molecular; Molecular Profiling; Mus; Mutate; Mutation; Normal Cell; Organism; Outcome; Physiological; Process; Proteins; Proteomics; Proto-Oncogenes; RNA Splicing; Regulation; Specificity; Tertiary Protein Structure; Tumor Suppressor Genes; Uracil; Vertebrates; abstracting; activation-induced cytidine deaminase; cis acting element; immune function; insight; leukemia/lymphoma; microbial; mutant; next generation; novel; novel therapeutics; pathogen; protein activation; research study

Abstract: Activation-induced deaminase (AID) is an enzyme that mutates genes for antibodies in vertebrates. These AID-mediated mutations are necessary for an organism to generate specific antibodies to recognize and eradicate great varieties of microbial infections. However, if AID is not properly regulated, it can change DNA sequences of genes important for normal cell functions and cause diseases. Indeed, some lymphomas and leukemias are caused by abnormal activities of AID. How AID can change DNA sequences only in antibody genes but not in other genes is poorly understood. Recently, the catenin ¿ like 1 protein (CTNNBL1) has been found to physically interact with AID. Little is known for the physiologic function of CTNNBL1. However, the interaction with CTNNBL1 is required for AID to change DNA sequences specifically in the antibody genes. In this study, a combination of high throughput approaches including next-generation sequencing and microarray analyses and targeted biochemical and immunologic analyses will be used to investigate how AID specifically mutate antibody genes, particularly what genomic regions are accessible to AID, both in the presence and in the absence of CTNNBL1. These experiments will also detect any alterations in transcription and splicing caused by the absence of CTNNBL1, and thereby shed lights on normal cellular functions of CTNNBL1. Mass spectrometry, mutagenic analyses and immunologic experiments will be performed to determine the molecular details of the interaction between AID and CTNNBL1 as well as to elucidate the mechanisms by which CTNNBL1 regulates the targeted activity of AID. It is anticipated that results from this study will be highly relevant for understanding the mechanisms underlying the generation of antibody diversity, and in the creation of new therapeutic strategies to minimize genomic disorders and cancers.

摘要： 活化诱导脱氨酶（AID）是一种使脊椎动物中抗体基因突变的酶。这些 艾滋病介导的突变是生物体产生特异性抗体所必需的， 根除各种微生物感染。然而，如果AID没有得到适当的监管，它可以改变DNA 基因序列对正常细胞功能和引起疾病很重要。事实上，一些淋巴瘤和 白血病是由AID的异常活性引起的。AID如何仅在抗体中改变DNA序列 而不是在其他基因中，这一点知之甚少。最近，连环蛋白样1蛋白（CTNNBL 1）已被发现。 发现与艾滋病有身体上的相互作用。CTNNBL 1的生理功能知之甚少。但 AID需要与CTNNBL 1相互作用来特异性改变抗体基因中的DNA序列。 在这项研究中，高通量方法的组合，包括下一代测序和 微阵列分析和有针对性的生化和免疫学分析将用于研究艾滋病如何 特异性地突变抗体基因，特别是哪些基因组区域是AID可以接近的，无论是在 存在和不存在CTNNBL 1。这些实验还将检测转录中的任何改变 以及由于CTNNBL 1的缺失而引起的剪接，从而揭示了正常的细胞功能， CTNNBL 1.将进行质谱分析、致突变分析和免疫学实验， 确定AID和CTNNBL 1之间相互作用的分子细节，并阐明 CTNNBL 1调节AID靶向活性的机制。 预计这项研究的结果将与理解机制高度相关 潜在的抗体多样性的产生，并在创建新的治疗策略，以尽量减少 基因组疾病和癌症。