在Morus L. 中广泛的nrDNA多态化及其应用
Xiaoxiang Xu1, Le Zhang1, Changwei Bi2
1State Key Laboratory of Resource Insects, Institute of Sericulture and Systems Biology, Southwest University, 216 Tiansheng Road, Beibei District, Chongqing 400716, China.
Plants (Basel, Switzerland)
|August 28, 2025
概括
桑 (Morus) 种的核核糖核基因组 (nrDNA) 显示不完整的协同进化,在内部转录间距区域 (ITS) 具有高的多态性. 这一发现有助于摩的分类和繁殖.
科学领域:
- 基因组学
- 植物分类学
- 分子进化
背景情况:
- 内部转录间隔器 (ITS) 对 Morus 属的分类学至关重要,但全基因组核核糖核蛋白 (nrDNA) 的特征尚未得到充分理解.
- 虽然ITS进化通常是协调的,但也有例外,这表明Morus内部的nrDNA进化存在潜在的复杂性.
研究的目的:
- 为了研究Morus属的全基因组nrDNA特征.
- 评估Morus物种中NRDNA协同演变的程度.
- 开发用于Morus物种识别和基因分析的新型分子标记物.
主要方法:
- 在542个木连接的nrDNA区域内识别和分析单核酸多态 (SNPs) 和插入/删除 (InDels).
- 使用克隆和桑格测序验证ITS多态性.
- 开发一种分裂放大多态序列 (CAPS) 标记物种分化.
主要成果:
- 在16个Morus物种中确定了158个SNP和15个InDels,显示出显著的个体内多态性和不完整的nrDNA协调进化.
- ITS区域 (ITS1-5.8S-ITS2) 呈现出高多态性,其中有66个SNP和13个INDEL.
- 在ITS1中使用13/16bp的InDel开发了一种新的CAPS标志物,使得M. alba和M. notabilis能够快速分辨.
结论:
- 在Morus中,nrDNA表现出不完全的协调进化,具有显著的个体内多态性,特别是在ITS区域.
- 开发的CAPS标记器提供了一个有效的工具来区分关键的Morus物种,绕过传统的测序或表型分析.
- 这些发现增强了对Morus分类的理解, 支持了树的保护和繁殖计划.
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