相关实验视频

Updated: Jun 24, 2025

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

Published on: September 11, 2020

在细菌病原体Streptococcus pneumoniae D39中,自发突变和对青素治疗的突变反应

Wanyue Jiang^1,2, Tongtong Lin¹, Jiao Pan¹

¹Institute of Evolution and Marine Biodiversity, KLMME, Ocean University of China, Qingdao, 266003 China.

Marine life science & technology

|June 3, 2024

概括

肺炎链球菌表现出惊人的高自发突变率,比其他细菌大得多. 这种高突变率与减少DNA不匹配修复效率有关,影响病原体进化.

科学领域:

微生物学微生物学
遗传学遗传学是一个
进化生物学进化生物学

背景情况:

具有功能性DNA修复系统的细菌通常表现出较低的突变率,这是由于对基因组稳定性的选择.
肺炎 estreptococcus 是一个重要的人类病原体,负责各种常见疾病.

研究的目的:

为了研究野生类型的肺炎链球菌 (Streptococcus pneumoniae D39.9) 的自发突变率.
了解其突变率的潜在机制和进化影响.

主要方法:

在Streptococcus pneumoniae D39.3上进行了突变积累 (MA) 实验.
评估了DNA不匹配修复 (MMR) 的效率.
研究了青素治疗对突变率的影响.

主要成果:

肺炎链球菌D39表现出高自发突变率 (每基因组每细胞分裂0.02),明显高于其他非突变细菌.
观察到一种明显的对A/T的突变倾向.
该病原体在细菌中表现出最低的DNA不匹配修复效率.
青素治疗没有增加突变率,因为它不会诱导该物种的DNA损伤.

结论:

在S. pneumoniae中高突变率可能归因于选择效率降低,与小有效种群大小相关.
这些发现与了解宿主环境中的病原体进化有关.
这项研究为Streptococcus pneumoniae的基因组稳定性和进化潜力提供了关键的见解.

关键词:

抗生素抗生素是一种抗生素.修复DNA不匹配的修复突变频谱突变频谱中的突变中性进化是一种中性进化.氧化损伤修复氧化损伤修复

更多相关视频

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

Published on: January 17, 2014

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Published on: February 23, 2014

相关概念视频

Mismatch Repair

Mismatch Repair

Antibiotic Selection

Antibiotic Selection

Defense Against Bacterial Pathogens

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...

Viral Mutations

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...

Genome Copying Errors

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.