Notes on coccidian phylogeny, based on the apicoplast small subunit ribosomal DNA
Notes on coccidian phylogeny, based on the apicoplast small subunit ribosomal DNA
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DOI：
10.1007/s00436-001-0557-4
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发表时间：
2002-04-01
影响因子：
2
通讯作者：
Lukes, J
中科院分区：
文献类型：
--
作者：
Oborník, M;Jirku, M;Lukes, J
我们进行了系统发育分析，部分小亚基rRNA基因（SSU rRNA）序列的基础上，从13个顶质体（包括新序列的Sarcocystis muris和Hyaloklossia lieberkuehni）和16个其他质体，蓝藻作为外群。顶质体序列形成了一个高度支持的单系分支，两个不同的分支，代表球虫和血孢子虫，球虫分为艾美球虫科和肉孢子虫亚科。确定了H. lieberkuehni在Sarcocistidae内，作为弓形虫/新孢子虫组的姐妹。球虫质体序列似乎进化缓慢，而它们的同源物从血孢子虫更迅速地演变。我们认为，较高的进化速率反映在AT含量的增加和可能减少的外顶质体膜在一些血孢子虫。由于顶质体SSU rRNA基因序列，与它们的核同源物相比，提供了更多的信息位置，它们可以用于系统发育推断内Apicomplexa。
We performed a phylogenetic analysis, based on the partial small subunit rRNA gene (SSU rRNA) sequences from 13 apicoplasts (including new sequences of Sarcocystis muris and Hyaloklossia lieberkuehni) and 16 other plastids, with cyanobacteria as an outgroup. The apicoplast sequences formed a highly supported monophyletic clade with two distinct clades, representing coccidia and haemosporidia, with coccidia divided into Eimeriidae and Sarcocystidae subclades. We confirmed the phylogenetic position of H. lieberkuehni within the Sarcocistidae, as a sister to the Toxoplasma/Neospora group. The coccidian plastid sequences appear to evolve slowly, while their homologues from haemosporidians are more rapidly evolving. We suggest that the higher evolutionary rate is reflected by the increase in the AT content and the possible reduction of the outer apicoplast membrane in some haemosporidians. Since the apicoplast SSU rRNA gene sequences, when compared with their nuclear homologues, offer a higher number of informative positions, they can be used for phylogenetic inference within the Apicomplexa.