在基因工程微生物中仍可检测到基因标记物,这些微生物与CRISPR杀死开关相结合.
Anna M Hartig1, Wentao Dai1, Ke Zhang1
1Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States.
Environmental science & technology
|March 2, 2026
概括
带有CRISPR-Cas9杀死开关的基因工程微生物在生物控制后仍然可以释放可检测的DNA. 这种完整的微生物DNA对监测基因工程微生物 (GEMs) 构成环境风险和挑战.
科学领域:
- 环境微生物学环境微生物学
- 合成生物学 合成生物学
- 分子生物学分子生物学
背景情况:
- 生物控制策略对于环境应用中的基因工程微生物 (GEM) 是至关重要的.
- 克里斯普尔-Cas9杀死开关的目的是防止GEMs的意外扩散.
- 生物封闭后的残留GEM DNA带来了环境监测的挑战.
研究的目的:
- 评估CRISPR-Cas9杀死开关在防止GEM增殖和DNA释放方面的有效性.
- 通过使用CRISPR-Cas9系统,调查生物封闭后GEM DNA的命运.
- 评估GEM DNA在环境中的持久性和可检测性.
主要方法:
- 使用一个模拟的Escherichia coli GEM与CRISPR-Cas9杀死开关.
- 使用殖民地形成单位 (cfu) 和CRISPR向基因丰度量化GEM逃逸率.
- 在不同的环境中,在1小时内和几天内评估DNA完整性和DNase耐药性.
主要成果:
- 克里斯普尔-Cas9杀死开关显著减少了可行的GEMs (cfu),但显示了高的目标基因丰度,表明完整的DNA.
- 通过基因丰富性观察到高逃脱率 (10-1.6到10-1.0),与低cfu率 (10-6.2) 相比.
- 在细胞内,GEM DNA 在很大程度上保持完整,并且至少在1小时内抵抗DNase,在河水中几天内降解.
结论:
- CRISPR-Cas9杀死开关有效地抑制GEM生长,但不会消除可检测的DNA.
- 完整的GEM DNA在生物封闭后仍然存在,这带来了风险和复杂的监测.
- 需要进一步的研究,以了解生物约束对GEM及其DNA的全部影响,以减轻环境风险.
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