评估全基因组MADS-Box基因和Toona ciliata和Toona sinensis之间的表达特征之间的进化分歧
Xiao-Han Liu1,2, Yu Xiao1,2, Yan-Wen Lv1,2
1College of Forestry and Landscape Architecture South China Agricultural University Guangzhou China.
Ecology and evolution
|October 15, 2025
概括
图纳物种中的MADS盒子基因显示了花特征的进化分歧. 高度表达的基因在进化上受到限制,影响了花朵发育中的种际差异.
科学领域:
- 植物基因组学 植物基因组学
- 进化生物学 进化生物学
- 分子遗传学 分子遗传学
背景情况:
- 图纳和图纳是中国经济上重要的木材物种.
- 植物特征的跨物种变化与这些物种的交配系统有关.
- MADS盒子基因是血管精子中花模式的关键调节者.
研究的目的:
- 在T. ciliata和T. sinensis中识别和描述MADS盒子基因家族.
- 研究这些基因在花发育中的进化动态和功能作用.
- 探索花特征物种间分歧的遗传基础.
主要方法:
- 全基因组识别和分类MADS盒子基因.
- 对基因同质性,保存动机和促进区域的分析.
- 评估基因复制事件,选择压力 (Ka/Ks比率) 和转录基因表达模式.
- 转录范围的关联研究 (TWAS) 以将MADS盒子基因与花特征联系起来.
主要成果:
- 在T. ciliata中确定了97个MADS盒基因,在T. sinensis中确定了75个MADS盒基因,分为I型和II型.
- 亚家族内的基因显示出高同质性和保存的动机;促进体分析揭示了调控元素.
- 基因重复是常见的;大多数基因处于净化选择下,八个正基因处于弱阳性选择下.
- 在SEP,AP1/FUL,AG/STK,PI和AP3亚家族中观察到高表达.
- 发现进化速率和基因表达水平之间存在负相关性.
- 在T. sinensis. 中,TWAS发现了一些MADS盒基因与花特征之间的显著关联.
结论:
- 在图纳物种中,MADS盒子基因家族经历了显著的扩张和多样化.
- 高度表达的MADS-box基因的进化约束会影响花发育和物种间的分歧.
- 这些发现为推动T. ciliata和T. sinensis之间花特征演变的分子机制提供了洞察力.
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