导致线粒基因组大小变化和 Melastoma 中反复发生的细胞内 DNA 转移的因素
Shuaixi Zhou1, Xueke Zhi1, Runxian Yu1
1State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, China.
BMC genomics
|July 1, 2023
概括
植物线粒基因组大小的变化是由DNA转移事件驱动的. 这项研究揭示了因横向和细胞内DNA转移而导致Melastoma物种中线粒体区域的独特进化路径.
科学领域:
- 植物基因组学 植物基因组学
- 进化生物学是进化的生物学.
- 分子进化的分子进化.
背景情况:
- 种子植物中的线粒基因组大小表现出显著的变化,即使在密切相关的物种中也是如此.
- 横向DNA转移 (HDT) 和细胞内DNA转移 (IDT) 都与这种变异有关,但机制尚不清楚.
研究的目的:
- 描述三种Melastoma物种的线粒基因组.
- 为了研究驱动这个快速物种化的热带灌木属中线粒基因组大小变化的机制.
主要方法:
- 对Melastoma candidum,M. sanguineum和M. dodecandrum的线粒体组合和表征.
- 进行比较基因组分析以识别重组和序列差异.
- 识别潜在的水平和细胞内DNA转移事件.
主要成果:
- 在M.candidum,M.sanguineum和M.dodecandrum的线粒基因组组合中,它们的尺寸从391,595bp到412,026bp不等.
- 观察到显著的重组,特别是在M. dodecandrum和另外两种物种之间.
- 序列比较显示,非排列区域主要是由于线粒体序列的增益/损失,或者在M. dodecandrum中,来自叶绿体的序列和假定的HDT.
- 在M.penicillatum中发现了一种反复的IDT事件,尚未在所有种群中确定.
结论:
- 在Melastoma中对线粒基因组的表征提供了关于密切相关物种尺寸演变的见解.
- 经常发生的IDT事件可能导致种群或物种内的线粒体区域的演化史分歧.
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