在 Caenorhabditis 线虫杂交体中,有效的针对性与 CRISPR/Cas9 重组,并抑制了重组的发生
Dongying Xie1, Bida Gu2, Yiqing Liu1
1Department of Biology, Hong Kong Baptist University, Kowloon, Hong Kong SAR, China.
BMC biology
|September 29, 2023
概括
具有双导向RNA的CRISPR/Cas9能够在物种杂交中实现有针对性的重组 (TR),克服基于同质性的重组 (HR) 抑制. 这一突破有助于在具有挑战性的杂交基因组中进行基因映射,即使进行重新排列.
科学领域:
- 遗传学和基因组学 在
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 基于同质的重组 (HR) 对遗传映射至关重要,但由于序列分歧和基因组重组,在物种杂交中经常被抑制.
- 这种抑制阻碍了杂交生物体中关键位置的遗传映射,例如杂交不兼容性 (HI) 基因.
- 之前在线杂交物 (C. briggsae和C. nigoni) 中进行的测绘工作导致了很大的内进型大小,表明显著的HR抑制.
研究的目的:
- 开发一种针对性重组 (TR) 的强有力的方法,绕过物种杂交中的同质依赖机制.
- 在HR被抑制的混合基因组中实现高效的基因映射和基因克隆.
- 克服在不同的线虫物种之间绘制混合不相容位置的局限性.
主要方法:
- 使用CRISPR/Cas9技术与双导向RNA (gRNA) 诱导有针对性的重组 (TR).
- 测试了单一和双重gRNA在F1杂交和C. briggsae和C. nigoni之间逆交杂交的有效性.
- 在具有抑制HR的基因组区域中研究了TR,包括具有反转的基因组区域.
主要成果:
- 双重gRNA诱导了物种杂交中的父母染色体之间的高效TR,无论其序列同样性或遗传背景如何.
- 即使在基因组区域内实现了反转,其中基于HR的重组通常被抑制.
- 双gRNA方法绕过HR抑制,表明基于非同质性的末端连接机制.
结论:
- 具有双重gRNA的CRISPR/Cas9提供了一个强大的工具来规避物种杂交中的重组抑制.
- 这种有针对性的重组方法适用于各种混合系统,包括具有显著序列分歧和重新排列的混合系统.
- 预计该技术将在具有挑战性的混合环境中显著推进遗传映射和基因发现.
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