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首页> 外文期刊>Journal of genetics >The evolution and utility of ribosomal ITS sequences in Bambusinae and related species: Divergence, pseudogenes, and implications for phylogeny
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The evolution and utility of ribosomal ITS sequences in Bambusinae and related species: Divergence, pseudogenes, and implications for phylogeny

机译：竹节虫科及相关物种的核糖体ITS序列的进化和实用性：分歧，假基因及其对系统发育的影响

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Ribosomal internal transcribed spacer (ITS) sequences are commonly used for phylogenetic reconstruction because they are highly reiterated as components of rDNA repeats, and hence are often subject to rapid homogenization through concerted evolution. Concerted evolution leads to intragenomic uniformity of repeats even between loci on nonhomologous chromosomes. However, a number of studies have shown that the ITS polymorphism within individuals is quite common. The molecular systematics of Bambusinae and related species were recently assessed by different teams using independently generated ITS sequences, and the results disagreed in some remarkable features. Here we compared the ITS sequences of the members of Bambusa s. l., the genera Dendrocalamus, Dinochloa, Gigantochloa, Guadua, Melocalamus, Monocladus, Oxytenanthera, Thyrsostachys, Pleioblastus, Pseudosasa and Schizostachyum. We have reanalysed the ITS sequences used by different research teams to reveal the underlying patterns of their different results. After excluding the sequences suspected to represent paralogous loci, a phylogenetic analysis of the subtribe Bambusinae species were performed using maximum parsimony and maximum-likelihood methods. The implications of the findings are discussed. The risk of incorporating ITS paralogues in plant evolutionary studies that can distort the phylogenetic signal should caution molecular systematists.
机译：核糖体内部转录间隔区（ITS）序列通常被用于系统发育重建，因为它们作为rDNA重复序列的组成部分得到了高度重申，因此经常通过协调进化而经历快速均质化。一致的进化甚至在非同源染色体上的基因座之间也导致重复的基因组内一致性。但是，许多研究表明，个体中的ITS多态性非常普遍。最近，不同的团队使用独立生成的ITS序列评估了鼠尾草科和相关物种的分子系统，结果在某些显着特征上存在分歧。在这里，我们比较了Bambusa s成员的ITS序列。例如，Dendrocalamus，Dinochloa，Gigantochloa，Guadua，Melocalamus，Monocladus，Oxytenanthera，Thyrsostachys，Pleioblastus，Pseudosasa和Schizostachyum属。我们重新分析了不同研究团队使用的ITS序列，以揭示其不同结果的潜在模式。在排除怀疑代表旁系同源基因的序列后，使用最大简约性和最大似然方法对Bambusinae部落亚种进行了系统发育分析。讨论的结果的含义。在植物进化研究中掺入ITS旁系同源物的风险可能会使系统发生信号失真，因此应提醒分子系统专家。

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