Parasite ecology, evolution and population genetics: the evolutionary ecology of epidemiological triangles

寄生虫生态学、进化和群体遗传学：流行病学三角的进化生态学

• 批准号: 298374-2009
• 负责人: Chilton, Neil
• 金额: $ 1.38万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=526004
• 关键词: Parasite; ecology; evolution; population; genetics

There is a lack of knowledge regarding the evolutionary ecology of vector-borne diseases, that is, the ecological and historical interactions, and changes in the population genetic structure of the three groups of organisms that make up an 'epidemiological triangle'; vectors (e.g. mosquitoes & ticks), hosts (vertebrates), and pathogens (e.g., bacteria & viruses) transmitted by vectors to hosts. Ticks are the most important reservoirs and vectors of human infectious diseases in North America, and they are responsible for transmitting pathogenic agents to domestic animals and wildlife. There are over 30 tick species that occur in Canada, yet for many species, we know very little of the types (i.e. species and strains) of bacteria they contain. Over the next 5 years, graduate and undergraduate students in my research group will conduct innovative and exciting research projects on the population genetics and coevolution of organisms in epidemiological triangles, in which the vectors are different species of tick that differ in their life cycles, types of hosts used and/or their relative host specificity. Molecular techniques will be used to quantify the population genetics of ticks, bacteria and small mammals for multiple genetic markers. Spatial and temporal changes in the genetic structure of tick populations and of different bacterial strains will also be explored. Detailed knowledge of the population genetics and coevolutionary relationships of ticks, their bacteria and hosts, permits an understanding of anomalies in the epidemiology of vector-borne diseases, which might otherwise go explained. Our findings will provide key insights into the ecological and evolutionary factors influencing the population genetic structure of epidemiological triangles, and provide critical information for the construction of ecological epidemiological models of microbial transmission and the population dynamics of vector-borne diseases. Such work is also of importance because some tick species are expanding their geographical ranges in Canada, which poses an increased threat to human and animal health.

缺乏关于病媒传播疾病的进化生态学的知识，即生态和历史相互作用，以及构成“流行病学三角”的三组生物体的种群遗传结构的变化;病媒（如蚊子和蜱），宿主（脊椎动物）和病原体（如蚊子和蜱）。细菌和病毒）通过媒介传播给宿主。蜱是北美最重要的人类传染病宿主和媒介，它们负责将病原体传播给家畜和野生动物。加拿大有超过30种蜱虫，但对于许多物种，我们对它们所含的细菌类型（即物种和菌株）知之甚少。在接下来的5年里，研究生和本科生在我的研究小组将进行创新和令人兴奋的研究项目的群体遗传学和共同进化的生物体在流行病学三角形，其中的载体是不同种类的蜱，在他们的生命周期，类型的主机使用和/或其相对主机特异性不同。分子技术将用于量化蜱、细菌和小型哺乳动物的群体遗传学，以获得多个遗传标记。还将探讨蜱虫种群和不同细菌菌株遗传结构的时空变化。对蜱虫、其细菌和宿主的种群遗传学和共同进化关系的详细了解，可以理解病媒传播疾病流行病学中的异常现象，否则可能会解释。我们的研究结果将提供关键的见解影响流行病学三角形的群体遗传结构的生态和进化因素，并提供关键信息的微生物传播的生态流行病学模型的构建和媒介传播疾病的群体动力学。这项工作也很重要，因为一些蜱虫物种正在加拿大扩大其地理范围，这对人类和动物健康构成了越来越大的威胁。