相关实验视频

Updated: Jun 9, 2025

Producing Gene Deletions in Escherichia coli by P1 Transduction with Excisable Antibiotic Resistance Cassettes

Producing Gene Deletions in Escherichia coli by P1 Transduction with Excisable Antibiotic Resistance Cassettes

Published on: September 1, 2018

在大肠杆菌中feV-tRNA集成基因组岛的演变

Nguyen Thi Khanh Nhu^1,2, Brian M Forde^1,2,3, Nouri L Ben Zakour⁴

¹Institute for Molecular Bioscience (IMB), The University of Queensland, Brisbane, Queensland, Australia.

|October 24, 2024

概括

大肠杆菌中的基因组岛屿 (GI) 显示出多样化的进化,GI-pheV表现出模块化和动态变化. 这项研究的重点是泌尿病原性大肠杆菌和ST131克隆.

科学领域:

微生物学微生物学
基因组学就是基因组学.
进化生物学进化生物学

背景情况:

大肠杆菌具有显著的遗传多样性,特别是在它的辅助基因组中.
与tRNA集成的基因组岛屿 (GI) 促进大肠杆菌的致病性,但由于大小和变异性,研究它们具有挑战性.
GI的演变,特别是GI-pheV,对于理解大肠杆菌的毒性至关重要.

研究的目的:

研究大肠杆菌中GI-pheV的进化动态.
专注于泌尿病原性大肠杆菌 (UPEC) 和多抗药性ST131克隆.
了解GI-pheV的模块化结构和保存特征.

主要方法:

在不同的大肠杆菌菌株中对GI-pheV进行比较基因组分析.
遗传学分析以追踪ST131克隆中GI-pheV的进化史.
检查GI-pheV内的基因含量变异和排列.

主要成果:

GI-pheV 显示高基因含量多样性和模块化结构,intP4 是唯一保存的基因.
在同一种病型的菌株中观察到GI-pheV内保留的特征.
在约90%的ST131菌株中存在GI-pheV,并与核心基因组共同进化,显示与菌株特定事件相关的模块损失/收益.

结论:

GI-pheV遵循一个动态的进化途径,涉及插入,删除和重组.
GI-pheV的模块化性质允许在大肠杆菌种群中进行适应和多样化.
了解GI-pheV演变,可以了解大肠杆菌的致病性和传播,包括UPEC和ST131.

更多相关视频

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing

Published on: December 23, 2022

Quantification of Plasmid-Mediated Antibiotic Resistance in an Experimental Evolution Approach

Quantification of Plasmid-Mediated Antibiotic Resistance in an Experimental Evolution Approach

Published on: December 14, 2019

相关概念视频

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Diversity of Protists I

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...