Foraminifera and Cercozoa are related in actin phylogeny: Two orphans find a home?
Foraminifera and Cercozoa are related in actin phylogeny: Two orphans find a home?
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DOI：
10.1093/oxfordjournals.molbev.a003941
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发表时间：
2001-08-01
影响因子：
10.7
通讯作者：
Keeling, PJ
中科院分区：
文献类型：
--
作者：
Keeling, PJ
近年来，来自不同真核生物的蛋白质编码基因样本的增加表明，每个基因树的许多方面都与其他系统发育不一致。这导致人们相信每个基因树都有独特的优点和缺点，这表明只有通过使用几个不同基因的比较系统发育才能获得真核关系的准确图像。为此，对两个金蛛属植物 Chlorarachnion 和 Lotharella 以及三个鞭毛尾毛尾毛虫属的肌动蛋白基因进行了鉴定。包括这些新肌动蛋白基因的系统发育树证实了最近提出的氯蛛植物和尾虫（Cercozoa）之间的关系，更重要的是，还显示了尾虫和有孔虫之间的密切关系。这两个都是主要的真核生物群，包含极其多样化的生物体，但没有强有力的证据表明形态学或分子数据的进化地位。肌动蛋白系统发育所表明的尾兽纲和有孔虫纲的联合代表了确定所有主要真核生物群体之间广泛关系的漫长过程中的一个新步骤。
In recent years, the increased sampling of protein-coding genes from diverse eukaryotes has revealed that many aspects of each gene tree are at odds with other phylo genies. This has led to the belief that each gene tree has unique strengths and weaknesses, suggesting that an accurate picture of eukaryotic relationships will be achieved only through comparative phylogeny using several different genes. To this end, actin genes were characterized from two genera of chlorarachniophytes, Chlorarachnion and Lotharella, and three species of the cercomonad flagellate Cercomonas. Phylogenetic trees including these new actin genes confirm the recently proposed relationship between chlorarachniophytes and cercomonads (Cercozoa) and, more importantly, also show a close relationship between Cercozoa and Foraminifera. Both of these are major eukaryotic groups encompassing extremely diverse organisms, yet there is no strong evidence for the evolutionary position of either from morphological or molecular data. The union of Cercozoa and Foraminifera suggested by actin phylogeny represents a novel step in the long process of determining the broad relationships between all major eukaryotic groups.