利用内源型I-C CRISPR-Cas系统在Bifidobacterium breve中进行基因组编辑
Xiao Han1,2, Lulu Chang1,2, Haiqin Chen1,2
1State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China.
Applied and environmental microbiology
|February 6, 2024
概括
研究人员开发了一种CRISPR-Cas基因编辑系统用于Bifidobacterium breve,使基因删除和修改成为可能. 这一进步促进了对有益细菌的研究和下一代益生菌的开发.
科学领域:
- 微生物学和基因工程 基因工程
- 益生菌和肠道微生物组研究
背景情况:
- Bifidobacterium breve是一种关键的肠道细菌,具有显著的健康益处.
- 有限的遗传工具阻碍了研究B. breve的作用机制和合成生物学应用.
- 克里斯普尔-卡斯系统为B. breve.中的基因操纵提供了一个潜在的解决方案.
研究的目的:
- 开发和验证一种基于CRISPR-Cas的内源基因编辑系统,用于Bifidobacterium breve.
- 为了实现各种遗传修饰,包括基因删除,单基基替代和连续编辑.
- 克服B. breve研究当前遗传工具的局限性.
主要方法:
- 在B. breve中I-C型CRISPR-Cas系统的分类,基于cas基因集群.
- 在多个B. breve菌株中应用CRISPR-Cas系统用于 uracil phosphoribosyl-transferase (upp) 基因删除.
- 在uppp基因中证明单基基替代和停止编码子的插入.
- 成功删除了氨酸异构酶 (bbi) 基因,展示了连续编辑能力.
主要成果:
- 在B. breve中,I-C型CRISPR-Cas系统被分为两个不同的组.
- 从两个已识别的群体中,在五个B. breve菌株中实现了对uppp基因的有效删除.
- 成功地进行了对uppp基因的精确修改,包括翻译终止.
- 序列基因编辑的可行性通过删除bbi基因得到证实.
结论:
- 一个内源的CRISPR-Cas基因编辑工具包已经成功地建立了Bifidobacterium breve.
- 该系统支持多种基因操纵,显著扩大了B. breve.的基因编辑能力.
- 开发的工具将加速功能基因组分析和发现B. breve.中的新型益生菌功能.
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