菌体基因可以使CRISPR/Cas细菌免疫系统不活化
Joe Bondy-Denomy1, April Pawluk, Karen L Maxwell
1Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
Nature
|December 18, 2012
概括
科学家在菌体中发现了抑制细菌CRISPR-Cas系统的"抗CRISPR"基因. 这些基因允许菌体逃避细菌免疫防御,揭示了菌体与细菌相互作用的新层.
科学领域:
- 微生物学 微生物学
- 细菌学 细菌学是一门学科.
- 病毒学 病毒学
背景情况:
- 细菌利用CRISPR-Cas系统对外来DNA产生适应性免疫力.
- 克里斯普尔-卡斯系统使用小RNA识别和中和入侵的遗传元素.
- 菌体 (菌体) 是感染细菌的病毒,是CRISPR-Cas研究的主要焦点.
研究的目的:
- 识别和描述抑制细菌CRISPR-Cas系统的基因.
- 为了研究这些抑制基因在菌体-细菌相互作用中的作用.
- 探索这些发现对理解CRISPR-Cas机制和菌体-细菌共同进化的影响.
主要方法:
- 对感染Pseudomonas aeruginosa的细菌菌体进行基因组分析.
- 在菌体基因组内识别潜在的"抗CRISPR"基因.
- 在菌体中通过基因突变和添加实验对抗CRISPR基因的功能性表征.
- 在具有功能CRISPR-Cas系统的细菌中对菌体感染性的评估.
主要成果:
- 在Pseudomonas aeruginosa菌体中发现了五种不同的抗CRISPR基因.
- 反CRISPR基因的突变使得菌体无法感染具有功能CRISPR-Cas系统的细菌.
- 引入一个抗CRISPR基因使得菌体能够逃避CRISPR-Cas介导的免疫力.
结论:
- 菌体编码的抗CRISPR基因代表了菌体克服细菌CRISPR-Cas免疫力的机制.
- 反CRISPR基因的发现为CRISPR-Cas系统的功能提供了新的见解.
- 这些发现凸显了菌体和细菌之间正在进行的共同进化军备竞赛.
相关概念视频
CRISPR
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
CRISPR and crRNAs
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
CRISPR
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
DNA Bacteriophages
Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
The Antiviral System of Bacteria and Archaea: CRISPR
CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this defense.
CRISPR/Cas9 Genome Editing
The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...


