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解决静止-动态悖论:树中的基因组进化
Zuoying Wei1,2,3,4,5, Hengchi Chen4,5, Chao Feng1,3,6
1State Key Laboratory of Plant Diversity and Specialty Crops, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
Molecular biology and evolution
|September 26, 2025
概括
古代树的进化静止是一种动态的平衡,而不是静态的. 基因组活力,包括全基因组复制和可转移元素,推动了适应和多样化,同时保持了保存的形态.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 古植物学是古植物学.
背景情况:
- 尽管环境发生了变化,但形态上静态的血统 (进化静止) 的持久性是进化生物学中一个关键的未解决的问题.
- 树家族 (Cyatheaceae) 是一个古老的树谱系,起源于罗纪,表现出了显著的形态保守主义,使其成为研究静止和活力的理想模型.
- 了解古代血统中长期持久性和多样化的基因组机制对于进化见解至关重要.
研究的目的:
- 研究古树家族Cyatheaceae进化静止和活力的基因组基础.
- 探索全基因组复制和可转移元素在树适应和多样化中的作用.
- 阐明使形态保守主义与适应性进化相结合的遗传机制.
主要方法:
- 染色体尺度基因组测序三种生态上不同的Cyatheaceae物种.
- 对比基因组分析以确定全基因组复制事件和基因家族扩张/收缩.
- 对可转移元素活性,替代率和基因表达模式的分析.
主要成果:
- 大约1.54亿年前的一次共享的全基因组复制事件提供了适应优势,缓冲气候极端,并促进了利基范围的多样化.
- 树木和非树木系表现出与结构强化 (细胞壁生物发生) 和代谢弹性相关的重复基因的谱系特异保留.
- 由可转移元素驱动的神秘基因组活力,导致基因组大小变化,染色体重组和局部创新热点,尽管整体替代率缓慢.
结论:
- 树的进化静止代表了一种动态平衡,由调节性可塑性和局部基因组创新在保存的形态框架内维持.
- 基因组活力,特别是整个基因组的重复和可转移的元素活动,使得适应性多样化,同时保持古代血统的整体形态静止.
- 这项研究为古老植物群体的长期持久性和进化提供了新的基因组视角,突出了基因组调节和形态保守主义之间的相互作用.
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