Conflicting phylogenetic position of Schizosaccharomyces pombe
Conflicting phylogenetic position of Schizosaccharomyces pombe
复制标题
DOI：
10.1016/j.ygeno.2006.07.001
复制
发表时间：
2006-10-01
期刊：
影响因子：
4.4
通讯作者：
Boekhout, Teun
中科院分区：
文献类型：
--
作者：
Kuramae, Eiko E.;Robert, Vincent;Boekhout, Teun
裂殖酵母Sehizosaceharomycespombe在真菌生命树中的系统发育位置仍有争议。在文献中提出了三种可供选择的系统发育位置，即（1）位于疝囊菌纲和真囊菌纲的基部，（2）位于真囊菌纲的姐妹群，疝囊菌纲作为基部分支，或（3）位于疝囊菌纲的姐妹群，真囊菌纲作为基部分支。在这里，我们比较了91个集群的直向同源蛋白，包含一个单一的直向同源物，共有19个真核生物基因组。这91个直向同源物的大部分支持了S.粟酒裂殖酵母是子囊菌门中的一个基底谱系，从而支持了第二个命题。有趣的是，部分正向同源蛋白支持第四种尚未描述的替代物，其中S。粟酒裂殖酵母是担子菌门和子囊菌门的基础。系统发育树的两种拓扑结构都得到了很好的支持。我们认为，这两个正确地反映了有关物种的系统发育史。这种明显的矛盾可能指向真菌的异质核基因组。重要的是，为了正确理解真菌生命树，需要考虑到这一点。(c)2006年爱思唯尔公司All rights reserved.
The phylogenetic position of the fission yeast Sehizosaceharomyces pombe in the fungal Tree of Life is still controversial. Three alternative phylogenetic positions have been proposed in the literature, namely (1) a position basal to the Herniascomycetes and Euascomycetes, (2) a position as a sister group to the Euascomycetes with the Herniascomycetes as a basal branch, or (3) a sister group to the Herniascomycetes with Euascomycetes as a basal branch. Here we compared 91 clusters of orthologous proteins containing a single orthologue that are shared by 19 eukaryote genomes. The major part of these 91 orthologues supports a phylogenetic position of S. pombe as a basal lineage among the Ascomycota, thus supporting the second proposition. Interestingly, part of the orthologous proteins supported a fourth, not yet described alternative, in which S. pombe is basal to both Basidiomycota and Ascomycota. Both topologies of phylogenetic trees are well supported. We believe that both reflect correctly the phylogenetic history of the species concerned. This apparent paradox may point to a heterogeneous nuclear genome of the fungi. Importantly, this needs to be taken in consideration for a correct understanding of the fungal Tree of Life. (c) 2006 Elsevier Inc. All rights reserved.