在CRISPRRNA导向免疫过程中,自我与非自我歧视
Luciano A Marraffini1, Erik J Sontheimer
1Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, 2205 Tech Drive, Evanston, Illinois 60208, USA. marraffini@northwestern.edu
Nature
|January 15, 2010
概括
克里斯普尔系统使用特定的不匹配来区分自我与非自我DNA. 扩展DNA配对通过保护细菌染色体免受干扰来防止自身免疫.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
背景情况:
- 所有的免疫系统都必须区分自我与非自我,以防止自身免疫.
- 集群定期间隔的短平行体重复 (CRISPR) 系统提供了对细菌和古生物的外来DNA的防御.
- 克里斯普尔系统利用克里斯普尔相关 (Cas) 基因和克里斯普尔RNAs (crRNAs) 进行适应性免疫.
研究的目的:
- 阐明CRISPR系统区分自我和非自我DNA的机制.
- 了解CRISPR免疫如何避免向宿主基因组.
主要方法:
- 研究了在Staphylococcus epidermidis.中的CRISPR自我/非自我歧视机制.
- 分析了crRNAs和目标DNA之间的序列互补性的作用,包括不匹配和扩展配对.
主要成果:
- 在S. epidermidis中,CRISPR免疫力通过间隔序列之外的特定不匹配来许可外来DNA进行干扰.
- 通过保护细菌染色体,crRNA和CRISPR DNA重复之间的扩展基配对可以防止自身免疫.
- 在间距序列之外的差异互补性是CRISPR系统中保留的特征.
结论:
- 克里斯普尔系统采用了一种复杂的机制,使用crRNA基配对潜力,用于目标识别和自我基因组保护.
- 这种机制代表了一个广泛适用的解决方案,以解决所有免疫路径固有的自我/非自我歧视挑战.
相关概念视频
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 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...
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/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...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...


