功能性基因组学揭示了菌株特定的遗传要求,使Mycobacterium intracellulare的低毒生长
Yoshitaka Tateishi1,2, Yuriko Ozeki1, Akihito Nishiyama1
1Department of Bacteriology, Graduate School of Medicine and Dental Sciences, Niigata University, Niigata, Japan.
eLife
|December 23, 2025
概括
这项研究确定了Mycobacterium avium-intracellulare复杂肺病 (MAC-PD) 菌株中的基本基因. 临床菌株需要特定的基因来生长,特别是在低氧状态下,这表明新的药物点.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 传染性疾病 传染性疾病
背景情况:
- 细胞内菌菌是Mycobacterium avium-细胞内菌复杂肺病 (MAC-PD) 的一个关键原因.
- 目前结合宏类药物和抗结核药物的治疗方法的疗效有限.
- 在M. avium-intracellulare的基因组多样性需要识别新的药物点.
研究的目的:
- 在MAC-PD临床分离物中识别普遍必要的基因和新药标.
- 了解与类型菌株相比,临床MAC-PD菌株的基因组适应.
- 评估缺氧在MAC-PD病变发生中的作用,并确定与缺氧相关的目标.
主要方法:
- 在八个临床MAC-PD分离物和类型菌株ATCC13950.0上使用转子体测序 (TnSeq) 进行全基因组分析.
- 在标准和缺氧生长条件下对基本基因进行比较分析.
- 在小鼠肺部感染模型中验证基因要求.
主要成果:
- 确定了131个跨菌株共享的基本基因或与生长缺陷相关的基因.
- 临床菌株对葡萄糖生成和第七类分泌系统基因的依赖性增加,特别是在低氧状态下.
- 临床MAC-PD菌株更快地适应缺氧生长,并且在体内证明了对缺氧适应基因的确认需求.
结论:
- 临床MAC-PD分离物和类型菌株之间存在关键基因特征的差异,这凸显了在标识中需要临床分离物.
- 缺氧状况和相关的遗传要求对MAC-PD病原体至关重要,并且代表了新疗法的有希望的目标.
- 与宿主相关的条件和临床菌株对于发现高价值的药物标对抗MAC-PD至关重要.
更多相关视频
相关概念视频
Oxygen Requirements and Growth Patterns
1.1K
Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
1.1K
Stringent Response in E. coli
257
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...
257
Modern Molecular Taxonomy
541
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
541
Bacterial Phylum Actinobacteria
572
Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
572
Gene Regulation During Sporulation
401
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
401
Other Stress Responses in Bacteria
310
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
310


