Population genetic characterization of Cyclospora cayetanensis from discrete geographical regions

作者：Guo, Yaqiong; Li, Na; Ortega, Ynes R.; Zhang, Longxian; Roellig, Dawn M.; Feng, Yaoyu^*; Xiao, Lihua

来源：Experimental Parasitology, 2018, 184: 121-127.

DOI：10.1016/j.exppara.2017.12.006

• Cyclospora cayetanensis
• Multilocus sequence typing
• Genetic diversity
• Population genetics
• Geographical segregation

Cyclospora cayetanensis is an emerging pathogen that is endemic in developing countries and responsible for many large foodborne cyclosporiasis outbreaks in North America since 1990s. Because of the lack of typing targets, the genetic diversity and population genetics of C cayetanensis have not been investigated. In this study, we undertook a population genetic analysis of multilocus sequence typing data we recently collected from 64 C. cayetanensis specimens. Despite the extensive genetic heterogeneity in the overall C cayetanensis population, there were significant intra- and inter-genic linkage disequilibria (LD). A disappearance of LD was observed when only multilocus genotypes were included in the population genetic analysis, indicative of an epidemic nature of C. cayetanensis. Geographical segregation-associated sub-structuring was observed between specimens from China and those from Peru and the United States. The two subpopulations had reduced LD, indicating the likely occurrence of genetic exchange among isolates in endemic areas. Further analyses of specimens from other geographical regions are necessary to fully understand the population genetics of C cayetanensis.

• 出版日期2018-1
• 单位中国疾病预防控制中心; 河南农业大学; 华南热带农业大学; 华南农业大学