霍乱病毒的移动性与动物间的传播有关
Ian W Campbell1, Ruchika Dehinwal1, Alexander A Morano1
1Division of Infectious Diseases at Brigham & Women's Hospital, and Department of Microbiology at Harvard Medical School, Boston, MA, USA.
Nature communications
|August 27, 2025
概括
一个Vibrio cholerae运动基因,motV,增强了婴儿小鼠的肠道殖民和疾病. 这使得动物之间的霍乱传播更有效, 揭示了病原体传播的新见解.
科学领域:
- 微生物学
- 传染性疾病
- 病变发生
背景情况:
- 霍乱的爆发是由病原体Vibrio cholerae引起的.
- 了解V.霍乱的传播对于控制疫情至关重要.
- 现有的动物模型无法完全捕捉动物间的自然传播动态.
研究的目的:
- 为了确定促进传播的Vibrio cholerae因素.
- 调查V.霍乱病原和传播中的机动性作用.
- 将动物内部殖民和疾病与动物间传播联系起来.
主要方法:
- 在婴儿小鼠中使用了转子子屏幕来识别影响殖民和传播的V. cholerae基因.
- 一种motV删除突变 (ΔmotV) 的特点是其运动性,局部化和殖民能力.
- 评估了 ΔmotV 突变病毒和野生型 V. 霍乱病毒在 littermates 之间传播的效率.
主要成果:
- 运动相关基因motV的失活显著增加了V. 霍乱菌对小鼠的肠道定居.
- motV突变体表现出增强的运动性,在小肠中更早和更广泛的局部化,以及增加的病原体负担.
- 即使没有霍乱毒素,motV的删除也导致感染和原始老鼠之间的V. cholerae传播更有效.
结论:
- 霍乱病毒基因motV在动物内部殖民和疾病严重程度的调节中发挥着关键作用.
- 除了霍乱毒素驱动的腹之外,与机动性相关的表型对V. cholerae的传播有显著的贡献.
- 这项研究确立了殖民,疾病和V. 霍乱的有效动物间传播之间的联系.
相关概念视频
01:10Intracellular Movement of Viruses and Bacteria
2.9K
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
2.9K
01:18Flagella and Motility in Bacteria
460
Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
460
01:27Chemotaxis in E. coli
95
Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
95
01:26Bacterial Translocation and Protein Secretion
78
Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
78
00:57Viral Recombination
23.8K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
23.8K
01:19Mechanism of Conjugation
130
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...
130