非结合性等离子体限制了它们在自然界中持续存在的移动性
Akshay Sabnis1, Wendy Figueroa1, Alfonso Santos-López2
1Department of Infectious Disease, Imperial College London, London SW7 2AZ, UK; Centre for Bacterial Resistance Biology, Imperial College London, London SW7 2AZ, UK.
Cell reports
|October 23, 2025
概括
等离子体进化以限制自身的传播,保持多样性以保护细菌免受抗生素和菌体等威胁. 这一策略确保了长期的生存,解释了大自然中低等离子体的移动性.
科学领域:
- 微生物学 微生物学
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
背景情况:
- 等离子体是传播有益基因的移动遗传元素,包括抗生素耐药性.
- 塑体分布和移动性的进化驱动因素尚未完全理解.
- 据认为非结合性等离子体可以有效地传播,但证据有限.
研究的目的:
- 为了研究Staphylococcus aureus中非结合性质粒的进化策略.
- 挑战非结合性等离子体进化为高频传播的假设.
- 了解等离子体流动性在细菌群体动态和生存中的作用.
主要方法:
- 对金黄色葡萄球菌等离子体进行比较基因组分析.
- 调查菌体相关DNA序列的存在/缺失 (pac/cos位点).
- 模拟混合细菌种群中的等离子体转移动态.
主要成果:
- 黄金葡萄球菌非结合性等离子体缺乏必不可少的菌媒介转导部位 (pac/cos).
- 获取菌体DNA以增强移动性对等离子体进化是有害的.
- 低等离子体转移率促进等离子体共存,并保持细菌保护.
- 高等离子体流动性减少了等离子体的多样性,减少了保护效益,增加了人口的脆弱性.
结论:
- 等离子体进化的目的是限制它们自身的移动性,优先考虑维护多样性而不是快速传播.
- 这种受限的流动性确保了细菌群体长期的生存,以抵御环境威胁.
- 这些发现解释了在自然环境中观察到的等离子体的低流动性.
相关概念视频
01:28Plasmids
1.2K
Plasmids are extrachromosomal DNA molecules found in bacteria, archaea, and some eukaryotic microbes like yeast. These small, circular DNA structures typically contain fewer than 30 genes, although some may exist linearly. Plasmids vary in their number within a cell, known as copy number. Single-copy plasmids are present in one copy per cell and multi-copy plasmids are present in multiple copies, reaching over 100 copies per cell.Plasmids usually replicate independently of the chromosomal DNA...
1.2K
01:19Conjugation
1.9K
Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
1.9K
01:33Bacterial Transformation
59.3K
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
59.3K
01:19Mechanism of Conjugation
810
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
810
00:46Genomic DNA in Prokaryotes
48.3K
The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...
Genomic Diversity in Bacteria
Although bacterial genomes are much...
48.3K
01:16Viral Replication: Lysogenic Cycle
1.3K
The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
1.3K