获得的CRISPR间隔器和拉姆诺斯-葡萄糖多糖体缺陷使人对Streptococcus mutans菌APCM01产生抵抗力
1Department of Molecular Biology, University of Wyoming, Laramie, WY 82071, USA.
bioRxiv : the preprint server for biology
|July 14, 2025
概括
Streptococcus mutans 中的菌体耐药性可以通过CRISPR间隔器或rhamnose-glucose多糖基因突变而发展. 这些突变,虽然赋予了耐药性,但显著降低了细菌的适应性和生物膜的形成,限制了化潜力.
科学领域:
- 微生物学 微生物学
- 遗传学 是一个遗传学.
- 口腔健康 口腔健康
背景情况:
- 突变性链球菌 (Streptococcus mutans) 是全球牙损伤的主要原因.
- 口服菌体冲洗是一种治疗策略,用于对抗S. mutans感染.
研究的目的:
- 调查S. mutans.中菌素耐药性发展的机制.
- 分析菌素耐药性对细菌适应性和致病性的影响.
主要方法:
- 隔离和全基因组测序自发的菌素耐药S. mutans突变的突变.
- 识别CRISPR隔离器和突变在拉姆诺斯-葡萄糖多糖化物 (RGP) 生物合成基因.
- 对抗性突变物中的菌体吸收,细胞分裂和生物膜形成的评估.
主要成果:
- 在15个耐药突变中,有10个获得了针对菌体的新型CRISPR间隔器.
- 八个突变者在RGP生物合成基因中发生了突变,其中一些也获得了间隔器.
- RGP突变损害了菌体的吸收,而rgpF,rgpX和rgpD中的突变导致细胞分裂缺陷和减少生物膜形成.
- 模型菌APCM01显示出可能感染S. mutans的血清型e和c菌株.
结论:
- 菌体对S. mutans的耐药性可能来自于CRISPR介导的免疫力或细胞表面甘氨酸的改变.
- RGP突变赋予了菌体耐药性,但却带来了巨大的健康成本,降低了S. mutans的致病潜力.
- APCM01菌体在主要的S. mutans血清型中表现出广泛的传染性,这表明它有治疗应用的潜力.
相关概念视频
CRISPR and crRNAs
17.4K
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...
17.4K
The Antiviral System of Bacteria and Archaea: CRISPR
133
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...
133
CRISPR/Cas9 Genome Editing
272
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...
272


