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首页> 外文期刊>Southeastern naturalist >Genetic Structure at the Major Histocompatibility Complex in the Endangered Barrens Topminnow (Fundulus julisia)
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Genetic Structure at the Major Histocompatibility Complex in the Endangered Barrens Topminnow (Fundulus julisia)

机译：濒危贫瘠Topminnownow（吉利西亚大小写）的主要组织相容性综合体遗传结构

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摘要

Genetic diversity at the Major Histocompatibility Complex (MHC) is particularly important for species viability as it allows populations to respond to emerging pathogens and infectious disease. Patterns of variation at this gene complex serve as a useful complement to information obtained from neutral loci for planning management and conservation strategies that seek to ensure the adaptive potential of at-risk species. In this study, we investigated patterns of genetic variation at exon 2 of the MHC class II gene in the critically endangered Fundulus julisia (Barrens Topminnow). This species has undergone dramatic declines over the last 30 years, leading to its recent proposal for federal protection under the Endangered Species Act. Patterns of nucleotide substitution and phylogenetic analyses revealing trans-species polymorphisms suggest that this locus has been of adaptive importance in the history of this species. Despite recent population declines and documented population bottlenecks, measures of genetic diversity were high in comparison to patterns observed at putatively neutral microsatellite and mitochondrial markers. Results from this study are discussed in the context of recovery plans for the Barrens Topminnow and lend support to the previous designation of evolutionary significant units and management units based on neutral markers.
机译：主要组织相容性复合物（MHC）的遗传多样性对于物种的活力尤为重要，因为它允许种群对新出现的病原体和传染病作出反应。该基因复合物的变异模式作为从中性基因座获得的信息的有用补充，用于规划管理和保护策略，该策略寻求确保风险物种的适应性潜力。在这项研究中，我们在危及濒危基质朱西（贫瘠Topminnow）中调查了MHC II类基因的外显子2的遗传变异模式。该物种在过去30年中经历了戏剧性的下降，导致其最近在濒危物种法案下对联邦保护的建议。核苷酸替代和系统发育分析的模式显示Trans-物种多态性表明，该基因座在该物种的历史上具有适应性的重要性。尽管最近的人口下降和记录了人口瓶颈，但遗传多样性的措施与在借用中性微卫星和线粒体标志物观察到的模式相比之下。本研究的结果是在贫瘠的Topminnow的恢复计划的背景下讨论，并借助基于中性标记的进化有效单位和管理单位的先前指定。

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