Genetic diversity in virulence genes of Plasmodium falciparum

恶性疟原虫毒力基因的遗传多样性

• 批准号: 7547778
• 负责人: Laura Kirkman
• 金额: $ 13.1万
• 依托单位: WEILL MEDICAL COLL OF CORNELL UNIV
• 依托单位国家: 美国
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-01-15 至 2012-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7547778
• 关键词: Antigenic Variation; Area; Biological; Biology; Clinical; Code; Communicable Diseases; Complement; DNA Damage; DNA Repair; Data; Disease Outbreaks; Double Strand Break Repair; Erythrocytes; Gene Conversion; Gene Family; Generations; Genes; Genetic; Genetic Recombination; Genetic Variation; Genotype; Goals; Hospitals; Immune response; Immune system; Infection; Internal Medicine; Intervention; Investigation; Malaria; Medical center; Membrane Proteins; Molecular; Molecular Biology; New York; Parasites; Pathogenesis; Patients; Pharmaceutical Preparations; Plasmodium falciparum; Play; Presbyterian Church; Principal Investigator; Program Development; Property; Research; Research Personnel; Research Proposals; Role; Sampling; Sorting - Cell Movement; Staging; Surveys; Testing; Time; Training; Training Programs; Transgenic Organisms; Tropical Medicine; Vaccines; Virulence; Virulence Factors; Work; career; design; genetic analysis; genetic manipulation; in vivo; programs; promoter; recombinational repair; repaired; response; skills

DESCRIPTION (provided by applicant): The following proposal describes a five-year training program for the development of an academic career in Infectious Diseases. The principal investigator has completed her clinical training in Internal Medicine at Yale New Haven Hospital and Infectious Diseases at New York Presbyterian, Weill Cornell Medical Center. She now aims to develop her research skills studying the molecular biology of the malaria parasite Plasmodium falciparum with the long term goal of establishing an independent research program combining tropical medicine and molecular biology. The principal investigator has developed a customized research proposal integrating molecular biology of DNA repair and the study of tropical medicine. This proposal will further the understanding of antigenic variation in malaria by integrating the study of the parasite mechanisms for DNA recombination and repair and the genetic analysis of field isolates. Dr. Kirk Deitsch will serve as sponsor and is a leader in the genetic manipulations of P. falciparum. This program is enhanced by the co-sponsorship of Dr. William Holloman, his expertise in DNA recombination and repair enhances both the proposed work and the training of the principal investigator. Research will focus on the var genes that encode PfEMP1, the primary surface protein implicated in antigenic variation of P. falciparum. This surface protein also determines the cytoadherent properties of an infected red cell, a known virulence factor in P. falciparum infection. Surveys of clinical samples have shown that var genes are extremely diverse genetically. Each parasite isolate contains a complement of -60 var genes that is unique, thus giving each parasite its own distinct repertoire of antigenic molecules. How this extreme diversity is generated has not been extensively explored and is the focus of this research proposal. Transgenic parasite lines will be used to directly study different mechanisms of DNA recombination and repair in P. falciparum. Our transgenic parasite lines have been designed so that we can target DNA damage for repair analysis to var gene coding regions or drug selectable markers driven by var gene promoters. In this way, we will be able to study how DNA damage and subsequent repair may contribute to the generation of diversity in this important gene family. The study of var gene changes in field samples will complement our data generated from the study of transgenic parasites. Relevance: Appreciation of the mechanisms that generates diversity in this key parasite surface protein is fundamental to understanding the pathogenesis of P. falciparum infections. Further investigation of the host immune response to malaria infection and how the parasite is able to adapt to this response is important in directing intervention efforts, ie vaccines, and findings ways reduce the burden of malaria worldwide.

描述（由申请人提供）：以下建议描述了一个为期五年的培训计划，在传染病的学术生涯的发展。主要研究者已完成耶鲁纽黑文医院内科和纽约长老会威尔康奈尔医学中心传染病的临床培训。她现在的目标是发展她的研究技能，研究疟疾寄生虫恶性疟原虫的分子生物学，长期目标是建立一个独立的研究计划，结合热带医学和分子生物学。首席研究员制定了一项定制的研究计划，将DNA修复的分子生物学和热带医学研究相结合。 该建议将通过整合寄生虫DNA重组和修复机制的研究以及田间分离株的遗传分析，进一步了解疟疾的抗原变异。Kirk Deitsch博士将担任赞助商，并且是恶性疟原虫基因操作的领导者。William Holloman博士的共同赞助加强了该计划，他在DNA重组和修复方面的专业知识增强了拟议的工作和主要研究者的培训。 研究将集中在编码PfEMP 1的var基因上，PfEMP 1是与恶性疟原虫抗原变异有关的主要表面蛋白。这种表面蛋白还决定了感染红细胞的细胞粘附特性，这是恶性疟原虫感染中的一种已知毒力因子。对临床样本的调查表明，var基因在遗传上是极其多样的。每种寄生虫分离物含有独特的~ 60个var基因的互补，从而赋予每种寄生虫其自身独特的抗原分子库。这种极端的多样性是如何产生的还没有得到广泛的探讨，这是本研究提案的重点。转基因寄生虫系将用于直接研究恶性疟原虫中DNA重组和修复的不同机制。我们的转基因寄生虫系已经被设计成使得我们可以靶向DNA损伤以用于对var基因编码区或由var基因启动子驱动的药物选择标记进行修复分析。通过这种方式，我们将能够研究DNA损伤和随后的修复如何有助于这一重要基因家族的多样性。田间样品中var基因变化的研究将补充我们从转基因寄生虫研究中获得的数据。 相关性：了解产生这种关键寄生虫表面蛋白多样性的机制是理解恶性疟原虫感染发病机制的基础。进一步调查宿主对疟疾感染的免疫反应以及寄生虫如何能够适应这种反应，对于指导干预工作（即疫苗）和发现减少全球疟疾负担的方法非常重要。