再组合的景观和 karyotypic 变异通过葡萄藤的链接映射揭示了阴菌病原体Plasmopara viticola
Etienne Dvorak1, Isabelle D Mazet1, Carole Couture1
1SAVE, INRAE, Bordeaux Sciences Agro, ISVV, Villenave d'Ornon F-33140, France.
G3 (Bethesda, Md.)
|November 29, 2024
概括
这项研究绘制了Plasmopara viticola的重组景观,葡萄藤菌病原体. 这些发现揭示了可变的重组率和对基因组结构的洞察力,有助于未来的遗传研究.
科学领域:
- 基因组学和遗传学 基因组学和遗传学
- 植物病理学 植物病理学
- 卵菌生物生物学 卵菌生物生物学
背景情况:
- 葡萄菌的致病因子Plasmopara viticola表现出由年度性繁殖和基因型多样性驱动的快速适应.
- 了解重组景观对于破译这种重要的植物病原体的进化动态和遗传结构至关重要.
研究的目的:
- 为了研究整个Plasmopara viticola基因组的重组景观.
- 为了生成高密度的遗传图,并分析基因组对线性和合成.
- 探索重组率,基因组特征和基因分布之间的关系.
主要方法:
- 两个半兄弟姐妹F1后代的生成 (N = 189和162) 用于基因映射.
- 针对性的SNP测序,以开发成千上万的标记物集成的家长和共识链接地图.
- 将参考基因组组装成17个伪染色体,并分析重组率和型变异.
主要成果:
- 一个共识地图整合了4,509个标记,将88%的参考基因组固定在17个伪染色体上.
- 中位数重组率为13.8cM/Mb,具有显著的染色体变异和中心区域的抑制.
- 重组率与基因覆盖率正相关,与重复覆盖率负相关;高重组区内分泌的蛋白质和效应因子基因不足. 在约5%的个体中观察到型异常 (无体,三体),主要来自男性传播的染色体.
结论:
- 生成的链接地图为未来的基因组组件和Plasmopara viticola的前沿遗传学提供了宝贵的资源.
- 在特定区域的可变重组率和抑制的重组影响基因组结构和基因分布.
- 年度性繁殖可能会导致较低的型变异与其他虫相比.
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