在免疫系统中,X-CHIME可实现组合性,诱导性,基因特异性和序列性基因淘汰
Martin W LaFleur1,2, Ashlyn M Lemmen1,2, Ivy S L Streeter1,2
1Department of Immunology, Blavatnik Institute, Harvard Medical School, Boston, MA, USA.
Nature immunology
|November 27, 2023
概括
X-CHIME系统能够在小鼠中进行快速的组合基因功能研究. 删除Ptpn1和Ptpn2导致死亡,揭示了它们在免疫细胞发育和成年人生存中的重要作用.
科学领域:
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 在体内研究基因功能往往依赖于耗时的淘汰赛小鼠模型.
- 之前的工作引入了CHimeric IMmune编辑 (CHIME) 用于通过CRISPR-Cas9在骨髓中删除单基因.
- 需要更快,更灵活的方法来研究复杂的基因相互作用.
研究的目的:
- 推出X-CHIME,一种多功能CRISPR-Cas9系统,用于快速,组合,可诱导,谱系特定和顺序基因删除.
- 评估Ptpn1和Ptpn2基因的体内功能,这些基因在一起被删除时是必不可少的.
- 为了证明X-CHIME在不同背景下用于机械基因评估的实用性.
主要方法:
- 开发了四种X-CHIME变体:C-CHIME (组合性),I-CHIME (诱导性),L-CHIME (谱系特定) 和S-CHIME (序列性).
- 使用C-CHIME和S-CHIME在成年小鼠中删除Ptpn1和Ptpn2.
- 评估基因删除的表型后果,包括骨髓细胞性,免疫细胞发育和生存.
主要成果:
- 构成性删除Ptpn1和Ptpn2导致骨髓低成形和致死性.
- 在免疫发育后,Ptpn1和Ptpn2的诱导性缺失导致肠炎和致死性.
- 这些发现突出了PTPN1和PTPN2之间的功能冗余,这对成人生存能力至关重要.
结论:
- X-CHIME提供了一个强大的平台,用于快速,体内对基因功能进行质询,包括组合和诱导性删除策略.
- PTPN1和PTPN2在维持造血平衡和成年人生存中发挥着关键的,部分冗余的作用.
- 这项工作推进了免疫基因功能和复杂的基因相互作用 in vivo 的研究.
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