一个CRISPR阵列调节Porphyromonas gingivalis中的毒性和宿主反应
Muhammad Irfan1, Ana Duran-Pinedo1, Jose Solbiati1
1Department of Oral Biology, College of Dentistry, University of Florida, Gainesville, Florida, USA.
Microbiology spectrum
|February 25, 2026
概括
在 Porphyromonas gingivalis 中的 CRISPR-Cas 系统调节生物膜的形成和毒性. 删除CRISPR阵列30.1增强了细菌生长和宿主免疫逃避,揭示了一个新的调节作用.
科学领域:
- 微生物学 微生物学
- 细菌遗传学 细菌遗传学
- 宿主-病原体相互作用
背景情况:
- 克里斯普尔-卡斯系统以对抗外来DNA的防御而闻名.
- 在 Porphyromonas gingivalis 的非编码 CRISPR 阵列中,尽管有丰富的间隔器,但缺乏定义的功能.
- 了解CRISPR在免疫之外的作用对于细菌致病发育研究至关重要.
研究的目的:
- 在 Porphyromonas gingivalis ATCC 33277.7.中研究非编码CRISPR阵列30.1的功能.
- 确定CRISPR阵列30.1删除对细菌生理学和宿主免疫反应的影响.
- 阐明CRISPR阵列的调节机制 30.1.1.阐明CRISPR阵列的调节机制
主要方法:
- 在CRISPR阵列30.1中删除突变结构在P. gingivalis.
- 生物膜形成试验.生物膜形成试验.
- 用于毒性评估的Galleria mellonella感染模型.
- 感染THP-1巨细胞的双RNA测序.
- 单个原始放大 (SPA) 用于识别间隔器-基因组相互作用.
主要成果:
- 删除CRISPR阵列30.1显著增加了P. gingivalis生物膜的形成和毒性.
- 突变者表现出改变的巨细胞转录基因反应,增加了促炎细胞因子和抑制了宿主免疫力.
- SPA发现了许多由CRISPR 30.1间隔器结合的自我基因组位点,表明了直接的调节活动.
- 阵列的损失激活了细菌的代谢和分泌途径.
结论:
- 克里斯普尔 30.1 阵列作为P. gingivalis生理学和毒性的新型调节者.
- 克里斯普尔间隔器直接调节细菌基因表达和宿主-病原体相互作用.
- 这一发现扩展了CRISPR-Cas系统的已知功能,并表明了潜在的治疗点.
相关概念视频
The Antiviral System of Bacteria and Archaea: CRISPR
808
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...
808
CRISPR and crRNAs
19.3K
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...
19.3K
CRISPR/Cas9 Genome Editing
2.1K
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...
2.1K
CRISPR
58.2K
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...
58.2K
Gene Regulation in Microbial Communities: Quorum Sensing
762
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
762
Immune Response Against Viral Pathogens
2.2K
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
2.2K


