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自主无活化的狂犬病的基因组稳定性
Ernesto Ciabatti1, Ana González-Rueda1, Daniel de Malmazet1
1MRC Laboratory of Molecular Biology, Cambridge, United Kingdom.
eLife
|November 3, 2023
概括
工程狂犬病病毒 (SiR) 能够长期操纵神经电路. "逆转"突变很少见,主要发生在广泛的体外放大过程中,而不是体内.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 病毒学 病毒学
背景情况:
- 跨突触病毒载体对于研究神经回路至关重要.
- 逆行单突触 ΔG-Rabies 病毒是一种广泛使用的工具.
- 工程自主无活化 (SiR) 狂犬病病毒允许长期基因操纵,但存在逆转的风险.
研究的目的:
- 为了研究自我无活化 (SiR) 狂犬病病毒的基因组稳定性.
- 确定SiR.中逆转突变的起源,发生率和相关性.
- 确认SiR-CRE的无毒性和体内稳定性.
主要方法:
- 在体外和体外对SiR的基因组稳定性测试.
- 在不同的放大条件下分析突变积累.
- 在生产细胞系中TEV蛋白酶活性评估.
- 与对照组相比,SiR-CRE的毒性和长期稳定性的评估.
主要成果:
- "逆转"突变很少见,主要是在广泛的体外放大过程中积累.
- 具有不足TEV蛋白酶活性的低最佳生产细胞系增加了突变风险.
- SiR-CRE证明没有毒性,与正规的ΔG-Rab-CRE或逆转剂SiR-CRE不同.
- 在长期实验中,体内没有出现逆转突变.
结论:
- 在标准条件下,SiR的基因组稳定性很高.
- 仔细优化体外生产,特别是TEV蛋白酶水平,最大限度地降低逆转风险.
- SiR-CRE是一种安全而稳定的工具,用于长期的神经电路操纵 in vivo.
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