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首页> 外文期刊>The Lichenologist >Group I intron-like insertions in SSU rDNA of Cladonia gracilis and C. rangiferina
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Group I intron-like insertions in SSU rDNA of Cladonia gracilis and C. rangiferina

机译：细枝小球藻和rangiferina SSU rDNA中的I组内含子样插入

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摘要

During a study on population genetics of three species of Cladonia using the nuclear ribosomal 18S DNA, two species contained group I intron-like sequences located in positions 788 and 940 with reference to the E. coli 16S rDNA gene. The intron in position 940 was not typical of group I introns and had previously been described only from the Parmeliaceae and Lecanoraceae, but here we report the occurrence of this intron in the Cladoniaceae. The intron in position 788 had characteristics of group I introns and had previously been reported from the Physciaceae. In this paper we provide for the first time a putative RNA fold for the nS788 intron, compare the secondary RNA structure of the Cladonia group I introns (nS788 and nS940) to that of other taxa, and infer a phylogenetic history among 15 members of the Lecanorales based on the evolutionary history of the nS788 group I intron. The RNA fold for nS788 contained two optional hairpins, P2.1 and a potentially newly described hairpin referred to as P5.1. The phylogenetic hypothesis supports the monophyly of the genus Cladonia. It also supports the separation of two large groups in the Physciaceae; the Buellia-group and the Physcia-group.
机译：在使用核糖核体18S DNA进行三种克拉德尼亚物种的种群遗传学研究期间，两个物种包含的I类内含子样序列位于大肠杆菌16S rDNA基因的788和940位。 940位内含子不是I类内含子的典型代表，以前仅从Parmeliaceae和Lecanoraceae中进行过描述，但是这里我们报道了该内含子在Cladoniaceae中的发生。 788位的内含子具有I组内含子的特征，并且先前已从科报道。在本文中，我们首次提供了nS788内含子的推定RNA折叠，将Cladonia I组内含子（nS788和nS940）的二级RNA结构与其他分类单元的二级RNA结构进行了比较，并推断了15个成员中的系统发育史。 Lecanorales基于nS788 I类内含子的进化史。 nS788的RNA折叠包含两个可选的发夹，P2.1和一个可能重新描述的发夹，称为P5.1。系统发育假说支持克拉德尼亚属的一系。它还支持将苦艾科中的两个大类分开。 Buellia组和Physcia组。

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