Occurrence of plastid RNA editing in all major lineages of land plants
Occurrence of plastid RNA editing in all major lineages of land plants
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DOI：
10.1073/pnas.94.12.6285
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发表时间：
1997-06-10
影响因子：
11.1
通讯作者：
Kossel, H
中科院分区：
文献类型：
--
作者：
Freyer, R;KieferMeyer, MC;Kossel, H
RNA编辑改变叶绿体编码的转录物中的转录后单核苷酸，尽管已经在质体编辑的机制和功能方面做了很多工作，但对该RNA加工步骤的进化方面知之甚少，为了更好地理解质体中RNA编辑的进化，我们已经研究了来自包括所有主要陆生植物群的各种物种的ndhB和rbcL转录物中的编辑模式，我们的研究结果表明，RNA编辑发生在brabetes，蕨类植物，真正的蕨类植物，裸子植物和被子植物的质体。编辑频率和编辑模式都表现出显著的种间差异，此外，我们发现质体编辑频率和特定转录本的编辑模式都与植物界的系统发育树无关，近缘物种之间编辑位点的进化保守性差，以及单一物种的出现-特定的编辑位点表明，编辑模式和编辑频率的差异可能是由于编辑位点的独立丢失和获得，此外，我们的结果表明RNA编辑是一个相对古老的过程，可能早于陆地植物的进化，这一假设与植物线粒体RNA编辑获得的系统发育数据非常一致，从而为两种植物细胞器编辑系统的共同进化根源提供了额外的证据。
RNA editing changes posttranscriptionally single nucleotides in chloroplast-encoded transcripts, Although much work has been done on mechanistic and functional aspects of plastid editing, little is known about evolutionary aspects of this RNA processing step, To gain a better understanding of the evolution of RNA editing in plastids, we have investigated the editing patterns in ndhB and rbcL transcripts from various species comprising all major groups of land plants, Our results indicate that RNA editing occurs in plastids of bryophytes, fern allies, true ferns, gymnosperms, and angiosperms. Both editing frequencies and editing patterns show a remarkable degree of interspecies variation, Furthermore, we have found that neither plastid editing frequencies nor the editing pattern of a specific transcript correlate with the phylogenetic tree of the plant kingdom, The poor evolutionary conservation of editing sites among closely related species as well as the occurrence of single species-specific editing sites suggest that the differences in the editing patterns and editing frequencies are probably due both to independent loss and to gain of editing sites, In addition, our results indicate that RNA editing is a relatively ancient process that probably predates the evolution of land plants, This supposition is in good agreement with the phylogenetic data obtained for plant mitochondrial RNA editing, thus providing additional evidence for common evolutionary roots of the two plant organellar editing systems.