Cryptosporidium is more closely related to the gregarines than to coccidia as shown by phylogenetic analysis of apicomplexan parasites inferred using small-subunit ribosomal RNA gene sequences
Cryptosporidium is more closely related to the gregarines than to coccidia as shown by phylogenetic analysis of apicomplexan parasites inferred using small-subunit ribosomal RNA gene sequences
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DOI：
10.1007/s004360050655
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发表时间：
1999-11-01
影响因子：
2
通讯作者：
Barta, JR
中科院分区：
文献类型：
--
作者：
Carreno, RA;Martin, DS;Barta, JR
通过比较小亚基核糖体RNA基因序列，得出了顶复门内的寄生虫（Apicomplexa：Gingerinasina）的系统发育位置。甘精氨酸序列来自Gesinina nipandrodes克洛普顿、Percival和Janovy（1991年）和敏捷单囊藻（1848年）（Eugregarinorida Leger 1900年），以及Ophriocystis elektroscirrha McLaughlin和Myers（1970年）（Neogreginorida Grasse 1953年）。序列与其他几个gregarine和apicomplexan序列从GenBank和简约和最大似然法分析所得的数据矩阵进行了比对。隐孢子虫形成一个单系分支，是隐孢子虫属的姐妹群。隐孢子虫/隐孢子虫分支是从其他主要的顶复门分支包含球虫，adeleids，pirosporidium，和haemosporinids分开。树表明，隐孢子虫属有一个更密切的系统发育亲和力与gregarines比与球虫。这些结果并不支持目前隐孢子虫科分类为艾美耳球虫亚目（Eimerioirina Leger，1911）。
The phylogenetic placement of gregarine parasites (Apicomplexa: Gregarinasina) within the Apicomplexa was derived by comparison of small-subunit ribosomal RNA gene sequences. Gregarine sequences were obtained from Gregarina niphandrodes Clopton, Percival, and Janovy, 1991, and Monocystis agilis Stein, 1848 (Eugregarinorida Leger 1900), as well as from Ophriocystis elektroscirrha McLaughlin and Myers, 1970 (Neogregarinorida Grasse 1953). The sequences were aligned with several other gregarine and apicomplexan sequences from GenBank and the resulting data matrix analyzed by parsimony and maximum-likelihood methods. The gregarines form a monophyletic clade that is a sister group to Cryptosporidium spp. The gregarine/ Cryptosporidium clade is separate from the other major apicomplexan clade containing the coccidia, adeleids, piroplasms, and haemosporinids. The trees indicate that the genus Cryptosporidium has a closer phylogenetic affinity with the gregarines than with the coccidia. These results do not support the present classification of the Cryptosporidiidae in the suborder Eimerioirina Leger, 1911.