Evolutionary significance of an unusual chloroplast DNA inversion found in two basal angiosperm lineages
Evolutionary significance of an unusual chloroplast DNA inversion found in two basal angiosperm lineages
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DOI：
10.1007/s002940050517
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发表时间：
2000-03-01
期刊：
影响因子：
2.5
通讯作者：
Olmstead, RG
中科院分区：
文献类型：
--
作者：
Graham, SW;Olmstead, RG
开花植物的两个基本谱系在叶绿体反向重复序列(IR)中存在基因间倒位，这是基因组中的一个区域，以前很少有关于这类结构突变的报道。倒位的大小(约200bp)将其归入以前在叶绿体基因组中未曾见过的类别。具有重排的两个谱系，即劳拉目和睡莲目的代表，并不是密切相关的，因此倒置可能独立地出现在每一组中。倒位的边界是短的，但高度保守的反向重复基序，这些基序最有可能与倒位过程有关，涉及这些基序的茎环结构可能在mRNA稳定性中发挥功能作用。它在基因间隔区的所有最优或几乎最优的预测RNA折叠中都能看到。
Two basal lineages of flowering plants possess an intergenic inversion in the chloroplast inverted repeat (IR), a region of the genome from which there have been few previous reports of this class of structural mutation. The size of the inversion (approximately 200 bp) places it in a class not previously seen in the plastid genome. The two lineages with the rearrangement, representatives of the orders Laurales and Nymphaeales, are not closely related and the inversion therefore probably arose independently in each group. The inversion is bordered by short, but highly conserved, inverted repeat motifs that were most likely associated with the inversion process, A stem-loop structure that involves these motifs may play a functional role in mRNA stability. It is seen in all optimal or nearly optimal predicted RNA foldings of the intergenic region.