The new phylogeny of eukaryotes
The new phylogeny of eukaryotes
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DOI：
10.1016/s0959-437x(00)00137-4
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发表时间：
2000-12-01
影响因子：
4
通讯作者：
Moreira, D
中科院分区：
文献类型：
--
作者：
Philippe, H;Germot, A;Moreira, D
考虑到从进化的角度解释形态数据的困难，分子系统发育被认为是重建真核生物之间关系的最终工具，特别是不同的原生生物群体。事实上，使用核糖体RNA作为标记已经提供了第一个很好解析的真核系统发育，从而产生了几个重要的进化假说。最重要的是，几个早期出现的线粒体谱系是真核进化早期的活生生的依赖。然而，替代蛋白质标记的使用和对几种分子系统发育重建人工制品的识别强烈挑战了这些想法。假定的早期出现的谱系已被证明是晚期出现的谱系，实际上被错误地放置在树的底部。真核生物进化的现状最好用多分叉来描述，这与假设主要真核生物门迅速多样化的“大爆炸”假说一致。为了进一步解决问题，需要通过改进的系统发育方法对基因组数据进行分析。
Molecular phylogeny has been regarded as the ultimate tool for the reconstruction of relationships among eukaryotes especially the different protist groups - given the difficulty in interpreting morphological data from an evolutionary point of view. in fact, the use of ribosomal RNA as a marker has provided the first well resolved eukaryotic phylogenies, leading to several important evolutionary hypotheses. The most significant is that several early-emerging, amitochondriate lineages, are living relies from the early times of eukaryotic evolution. The use of alternative protein markers and the recognition of several molecular phylogeny reconstruction artefacts, however, have strongly challenged these ideas. The putative early emerging lineages have been demonstrated as late-emerging ones, artefactually misplaced to the base of the tree. The present state of eukaryotic evolution is best described by a multifurcation, in agreement with the 'big bang' hypothesis that assumes a rapid diversification of the major eukaryotic phyla. For further resolution, the analysis of genomic data through improved phylogenetic methods will be required.