Closing the mitochondrial circle on paraphyly of the Monogenea (Platyhelminthes) infers evolution in the diet of parasitic flatworms
Closing the mitochondrial circle on paraphyly of the Monogenea (Platyhelminthes) infers evolution in the diet of parasitic flatworms
复制标题
DOI：
10.1016/j.ijpara.2010.02.017
复制
发表时间：
2010-09-01
影响因子：
4
通讯作者：
Whittington, Ian D.
中科院分区：
文献类型：
--
作者：
Perkins, Elizabeth M.;Donnellan, Steve C.;Whittington, Ian D.
新皮动物门三纲之间的关系（寄生扁形动物）是有争议的，限制了我们对寄生进化和偶然适应的理解（Cercomeromorphae：幼虫轴承后钩）已被驳回和重量的证据对monogenean单系已安装我们提出的核苷酸序列完整的线粒体（mt）序列的Benedema seriolae（Monogenea：Monopisthocotylea：Capsalidae）的基因组，这是第一个完整的非三趾螺属的单趾螺mt基因组被报道。我们还包括一些mt蛋白编码基因的第二capsalid，Neobenedenia属的核苷酸序列数据。分析新的mt基因组与所有可用的扁形动物mt基因组提供了新的系统发育假说，这强烈影响的饮食在Neodermata的进化前景。我们的分析不支持monogenean单系，但证实了Digenea和Cestoda是每个单系和姐妹群。寄生在鱼类宿主上的上皮摄食性寄生虫是新皮动物门的基础，代表了从自由生活的祖先到寄生的第一次转变。寄生的下一个进化步骤是从上皮到血液的饮食变化。双殖吸虫+绦虫的共同祖先是单殖吸虫样的，很可能是食血的。从这种祖先的条件下，成年digeneans和绦虫独立进化的饮食专业化，以适应其不同的微生境在其最终的脊椎动物宿主。这些对关系的改进的观点从根本上增强了我们对Neodermata寄生进化的理解，特别是饮食的进化。(C)2010年由Elsevier Ltd.代表Australian Society for Parasitology Inc.出版。
Relationships between the three classes of Neodermata (parasitic Platyhelminthes) are much debated and restrict our understanding of the evolution of parasitism and contingent adaptations The historic view of a sister relationship between Cestoda and Monogenea (Cercomeromorphae: larvae bearing posterior hooks) has been dismissed and the weight of evidence against monogenean monophyly has mounted We present the nucleotide sequence of the complete mitochondrial (mt) genome of Benedema seriolae (Monogenea: Monopisthocotylea: Capsalidae), the first complete non-gyrodactylid monopisthocotylean mt genome to be reported. We also include nucleotide sequence data for some mt protein coding genes for a second capsalid, Neobenedenia sp. Analyses of the new mt genomes with all available platyhelminth mt genomes provide new phylogenetic hypotheses, which strongly influence perspectives on the evolution of diet in the Neodermata. Our analyses do not support monogenean monophyly but confirm that the Digenea and Cestoda are each monophyletic and sister groups. Epithelial feeding monopisthocotyleans on fish hosts are basal in the Neodermata and represent the first shift to parasitism from free-living ancestors The next evolutionary step in parasitism was a dietary change from epithelium to blood. The common ancestor of Digenea + Cestoda was monogenean-like and most likely sanguinivorous. From this ancestral condition, adult digeneans and cestodes Independently evolved dietary specialisations to suit their diverse microhabitats in their final vertebrate hosts. These improved perspectives on relationships fundamentally enhance our understanding of the evolution of parasitism in the Neodermata and in particular, the evolution of diet. (C) 2010 Published by Elsevier Ltd. on behalf of Australian Society for Parasitology Inc.