病原体Sphaerulina musiva具有由染色体反转和可转移元素丰度变化标志着的动态基因组架构
Alex Z Zaccaron1, Alexandre Lassagne1, Kelsey L Søndreli1
1Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, USA.
Microbial genomics
|January 7, 2026
概括
对病原体Sphaerulina musiva的基因组分析显示了显著的可转移元素 (TE) 变异和染色体逆转. 这些基因组特征与不同地理区域的病原体适应和进化有关.
科学领域:
- 植物病理学 植物病理学
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 病原体具有动态的基因组,受到可转移元素 (TE) 的影响,使其能够适应环境压力和宿主防御.
- 评估基因组特征的适应性作用是很困难的,因为缺乏高质量的基因组组件,用于同一物种的多个分离物.
研究的目的:
- 为了研究推动Sphaerulina musiva的进化和适应的基因组因素,这是树的重要病原体.
- 分析地理上多样化的S. musiva分离物中的基因组结构,TE动态和染色体重组.
主要方法:
- 测序和组装近染色体规模的基因组从18个地理上多样化的北美孤立的S. musiva.
- 基因组比较分析,包括TE含量变化,基因组大小差异,泛基因组分析和染色体逆转的合成分析.
主要成果:
- 所有18个S. musiva分离物都具有13个染色体;TE含量有显著的变化 (6.8%-15.7%),与基因组大小相关,并表明了谱系特异性的增殖.
- 辅助基因,富含候选效应因子的基因,占泛基因组的9.5%. 增加的TE含量与效应基因的更长的基因间区域相关.
- 确定了43个长染色体逆转 (平均293 kb),覆盖了34%的基因组. 逆转在美国东部本地分离物中更为频繁,并可能影响基因集群组织.
结论:
- S. musiva表现出"一速基因组"的特征,但TE增殖可能会增加分类,特别是在效应基因周围.
- 染色体重组,特别是反转,很普遍,可能在S. musiva的适应和进化中发挥作用.
- 这些发现为了解病原体S. musiva的基因组结构,TE动态和进化适应提供了基础.
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