新兴的 Clostridioides difficile 核型具有不同的代谢表型
Firas S Midani1,2, Heather A Danhof1,2, Nathanael Mathew1,2
1Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, Texas, USA.
bioRxiv : the preprint server for biology
|August 26, 2024
概括
困难菌 (C. difficile) 是一种多功能肠道病原体. 这项研究揭示了C. difficile菌株的血统特异性代谢差异,影响了它们的适应性和潜在的治疗策略.
科学领域:
- 微生物学 微生物学
- 病原体的新陈代谢
- 基因组学就是基因组学.
背景情况:
- 困难菌是导致腹感染的主要原因之一.
- 在C. difficile菌株中存在遗传多样性,特定的核型主导人类感染.
- 流行性C. difficile核型的代谢适应仍然在很大程度上未被探索.
研究的目的:
- 在一系列多样化的C. difficile临床分离物中研究碳基质的利用.
- 为了确定与特定的核型和遗传系系相关的代谢差异.
- 了解C. difficile出现和适应的代谢基础.
主要方法:
- 88 C. difficile临床分离物的碳基质利用概况.
- 在22种不同的核糖型中进行生长测试.
- 遗传学分析以将代谢能力与遗传血统相关联.
主要成果:
- 困难菌表现出普遍的代谢能力,利用广泛的碳来源.
- 代谢表型按家族遗传关系聚集在一起,表现出 ribo-type 和 clade 特定的差异.
- 新兴的血统 (ribotypes 023, 255) 显示出不同的代谢特征.
- 在进化上最遥远的类 (Clade 5) 显示了对简单糖的强增长.
结论:
- 艰难的C. 采用一个通用的代谢策略,但具有显著的血统特异性适应.
- 代谢的多样性对于理解C. difficile的进化和发病过程至关重要.
- 这些发现支持通过利用代谢利基来合理设计有针对性的治疗干预措施.
相关概念视频
Other Glycolytic Pathways
The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
Stringent Response in E. coli
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
Bacterial Phylum Bacteroidota
The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
Evolution of New Traits in Microbes
Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
Determinants of Bacterial Pathogenicity and Virulence
Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...


