相关实验视频
Updated: Jan 6, 2026

10:52
Precise Phage Mutagenesis with NgTET-Assisted CRISPR-Cas Systems
Published on: October 14, 2025
559
一个菌体变量区域编码了抑制所有Streptococcus thermophilusCRISPR免疫系统的抗CRISPR蛋白
Katie A Johnson1, Clare Cooper1, Cécile Philippe1
1Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, USA.
The CRISPR journal
|September 29, 2025
概括
研究人员在Streptococcus thermophilus菌体中发现了新的抗CRISPR蛋白质,扩大了我们对菌体-CRISPR-Cas系统相互作用的理解,并确定了抗防御机制的关键基因组区域.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 克里斯普尔-卡斯系统为细菌和古生物提供了对移动遗传元素 (MGE) 的适应性免疫力.
- 移动遗传元素,如菌体,已经进化了抗CRISPR (Acr) 蛋白质,以逃避宿主免疫防御.
- 在Streptococcus thermophilus (Sth) 菌体中Acr蛋白的多样性仍然不完全表征.
研究的目的:
- 系统地识别Sth菌体中的新型抗CRISPR (Acr) 蛋白质.
- 研究Sth菌体中的Acr基因的基因组背景和多样性.
- 在菌体基因组中探索潜在的Acr独立免疫调节因子.
主要方法:
- 基因组上下文分析指导了未表征的Sth菌素蛋白的选.
- 进行了功能查,以确定抑制SthCRISPR-Cas系统的蛋白质.
- 生物信息分析预测了邻近蛋白质的域.
主要成果:
- 鉴定出了几种新型的Acr蛋白,它们可以抑制I-E,II-A和III-A类型的CRISPR-Cas系统.
- 已识别的acr基因聚集在一个可变的菌体基因组区域中,这表明了反防御进化的热点.
- 发现了具有预测酶或结构域的邻近蛋白质,可能调节菌体与宿主相互作用.
结论:
- 这项研究显著扩大了Sth菌体中已知的抗CRISPR蛋白质的知识库.
- 菌体变异基因组区域被强调为抗防御和免疫调节因子的关键储存库.
- 这些发现加深了对菌体和CRISPR-Cas系统之间的进化军备竞赛的理解.
相关概念视频
CRISPR and crRNAs
18.6K
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...
18.6K
The Antiviral System of Bacteria and Archaea: CRISPR
577
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...
577
CRISPR
57.3K
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...
57.3K
CRISPR/Cas9 Genome Editing
1.6K
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...
1.6K
DNA Bacteriophages
726
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...
726
Conservative Site-specific Recombination and Phase Variation
6.6K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.6K

