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首页> 外文期刊>Parasitology >New insights on the genetic diversity of the honeybee parasite Nosema ceranae based on multilocus sequence analysis
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New insights on the genetic diversity of the honeybee parasite Nosema ceranae based on multilocus sequence analysis

机译：基于多基因座序列分析的蜜蜂寄生虫Nosema ceranae遗传多样性的新见解

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摘要

The microsporidian parasite Nosema ceranae is a common pathogen of the Western honeybee (Apis mellifera) whose variable virulence could be related to its genetic polymorphism and/or its polyphenism responding to environmental cues. Since the genotyping of N. ceranae based on unique marker sequences had been unsuccessful, we tested whether a multilocus approach, assessing the diversity of ten genetic markers - encoding nine proteins and the small ribosomal RNA subunit - allowed the discrimination between N. ceranae variants isolated from single A. mellifera individuals in four distant locations. High nucleotide diversity and allele content were observed for all genes. Most importantly, the diversity was mainly present within parasite populations isolated from single honeybee individuals. In contrast the absence of isolate differentiation precluded any taxa discrimination, even through a multilocus approach, but suggested that similar populations of parasites seem to infect honeybees in distant locations. As statistical evolutionary analyses showed that the allele frequency is under selective pressure, we discuss the origin and consequences of N. ceranae heterozygosity in a single host and lack of population divergence in the context of the parasite natural and evolutionary history.
机译：微孢子虫寄生的Nosema ceranae是西方蜜蜂（蜜蜂）的常见病原体，其可变的毒力可能与其遗传多态性和/或对环境线索的多态性有关。由于基于唯一标记序列的certaine。ceranae基因分型不成功，我们测试了多位点方法是否能够评估十个遗传标记（编码9种蛋白质和小的核糖体RNA亚基）的多样性，从而能够区分出cerenae cerenae变异体来自四个遥远位置的单个A. mellifera个体。观察到所有基因的高核苷酸多样性和等位基因含量。最重要的是，多样性主要存在于从单个蜜蜂个体中分离出来的寄生虫种群中。相比之下，即使没有通过多基因座方法，分离株的分化也无法排除任何分类单元的歧视，但表明相似的寄生虫种群似乎在遥远的地方感染了蜜蜂。正如统计进化分析显示，等位基因频率处于选择压力之下，我们讨论了寄生虫自然和进化史中单宿主中的猪笼草杂合子的起源和后果以及缺乏种群分化。

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