泛基因组和泛转录组作为基因家族表征的新参考:大麦基本螺旋环螺旋 (bHLH) 基因的案例研究
Cen Tong1, Yong Jia1, Haifei Hu1
1Western Crop Genetic Alliance, Murdoch University, Murdoch, WA 6150, Australia; State Agricultural Biotechnology Centre (SABC), College of Science, Health, Engineering and Education, Murdoch University, Murdoch, WA 6150, Australia.
Plant communications
|November 10, 2024
概括
一种新的泛基因组方法揭示了大麦基本螺旋环螺旋 (bHLH) 基因家族的完整特征,揭示了基因存在/缺失变异和进化见解. 这种方法提高了对大麦bHLH基因进化和扩张机制的理解.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 植物科学 植物科学
背景情况:
- 对比基因家族分析对于理解物种特异性进化至关重要.
- 以前的研究通常依赖于单个参考基因组,忽视了基因存在/缺席变异 (gPAVs).
- 这种局限性阻碍了对基因家族进化的全面理解.
研究的目的:
- 引入一种基于泛基因组的创新方法,用于使用正统基因组 (OGG) 进行基因家族分析.
- 在大麦中识别和描述完整的基本螺旋环-螺旋环 (bHLH) 转录因子家族.
- 研究大麦中的bHLH基因的进化动态,扩张机制和保护模式.
主要方法:
- 开发了一种基于泛基因组的策略,用于使用OGGs进行基因家族分析.
- 应用基因组扫描方法,在20个大麦基因组中识别bHLH基因.
- 将bHLH基因分类为核心,软核心,外和特定系的类别.
- 分析了基因重复事件,转位子元素 (TE) 关联,选择压力和转录分歧.
主要成果:
- 确定了大麦bHLH家族的201个OGG,包括140个核心,12个软核,29个贝和20个特定系/云基因.
- 发现每个基因组平均有1.5个没有注释的核心bHLHs,克服了注释偏差.
- 全基因组/部分重复主要驱动核心/软核bHLH扩张,而小规模重复则有助于无需的bHLHs.
- 发现的TEs可能会影响bHLH的扩张,可用的bHLH显示放松的选择和在特定的子家族中丰富.
- 在整合泛基因组和泛转录组数据时,观察到bHLH亚家族内和跨bHLH亚家族的转录分歧.
结论:
- 基于泛基因组的方法提供了更准确的基因家族的进化状态,特别是大麦中的bHLHs.
- 这项研究为bHLH进化提供了新的见解,突出了gPAVs,TE和选择压力的作用.
- 该方法预计将适用于其他基因家族和物种进行全面的进化分析.
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