The highly rearranged chloroplast genome of Trachelium caeruleum (Campanulaceae): Multiple inversions, inverted repeat expansion and contraction, transposition, insertions/deletions, and several repeat families
The highly rearranged chloroplast genome of Trachelium caeruleum (Campanulaceae): Multiple inversions, inverted repeat expansion and contraction, transposition, insertions/deletions, and several repeat families
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DOI：
10.1007/s002940050225
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发表时间：
1997-05-01
期刊：
影响因子：
2.5
通讯作者：
Downie, SR
中科院分区：
文献类型：
--
作者：
Cosner, ME;Jansen, RK;Downie, SR
全面的基因图谱显示，与其他陆地植物相比，蓝藻的叶绿体基因组发生了高度重排。由七到十个倒位、一到两次转座、通常大小保守的倒转重复序列的扩张和收缩、推测的基因丢失、两个大开放阅读框内的删除和几次插入组成的进化场景足以从祖先被子植物叶绿体 DNA 排列中衍生出 Trachelium 排列。其中两个重排破坏了陆地植物中保守的转录单位。 Trachelium 叶绿体基因组中至少存在五个小型分散重复序列家族。大多数重复与倒位端点相关，并且可能通过同源重复之间的重组促进倒位。
Comprehensive gene mapping reveals that the chloroplast genome of Trachelium caeruleum is highly rearranged relative to those of other land plants. Evolutionary scenarios that consist of seven to ten inversions, one or two transpositions, both expansion and contraction of the typically size-conserved inverted repeat, a presumed gene loss, deletions within two large open reading frames and several insertions, are sufficient to derive the Trachelium arrangement from the ancestral angiosperm chloroplast DNA arrangement. Two of the rearrangements disrupt transcriptional units that are otherwise conserved among land plants. At least five families of small dispersed repeats exist in the Trachelium chloroplast genome. Most of the repeats are associated with inversion endpoints and may have facilitated inversions through recombination across homologous repeats.