相关实验视频

Updated: Jul 2, 2025

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

全球肠球菌的多样性和18种以前未知的物种的描述

Julia A Schwartzman^1,2,3, Francois Lebreton^1,2,4, Rauf Salamzade^5,6

¹Department of Ophthalmology, Mass Eye and Ear, Harvard Medical School, Boston, MA 02144.

Proceedings of the National Academy of Sciences of the United States of America

|February 28, 2024

概括

肠杆菌,常见的肠道微生物,已经在数百万年里进化了各种各样的物种. 这项研究发现了18种新物种,揭示了它们的进化和潜在的健康威胁.

科学领域:

微生物学微生物学
进化生物学进化生物学
基因组学就是基因组学.

背景情况:

肠球菌是无处不在的肠道微生物,在大多数陆地动物中发现.
已知有60多种,其中*Enterococcus faecalis*和*Enterococcus faecium*在人类健康和医院感染方面具有重要意义.
肠球菌宿主协会的进化驱动因素在很大程度上是未知的.

研究的目的:

调查遗传特征和进化史驱动*Enterococcus*属的宿主协会.
扩大已知的Enterococcus物种的多样性,了解它们的生态分布.
为 *Enterococcus* 属提供一个高分辨率的遗传学框架.

主要方法:

收集和分析886种来自不同宿主,环境和地理位置的Enterococcus菌株.
基因组测序和对已识别的菌株进行比较分析,以发现新的物种和基因.
遗传学重建以了解进化关系并识别分类定义特征.

主要成果:

鉴定了18种新的Enterococcus物种,使已知属的多样性增加了25%以上.
在新物种中发现了与毒素产生,排毒和营养获取相关的多种基因.
*E. faecalis*和*E. faecium*表现出广泛的宿主范围,而大多数其他物种表现出专门的关联.
高分辨率的基因组学揭示了四个主要细胞系的独特特征,并为B维生素生物合成和运动性绘制了基因.

结论:

扩大的多样性和基因组数据为Enterococcus进化和宿主适应提供了深刻的见解.
该研究强调了新发现的肠球菌物种对人类健康的潜在新威胁.
建议未来的研究方向是探索尚未发现的肠球菌多样性及其生态作用.

关键词:

肠球菌 (Enterococcus) 是一个细菌.抗生素耐药性抗生素耐药性基因组学就是基因组学.全球多样性的全球多样性.主体微生物的相互作用

更多相关视频

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS

Published on: July 11, 2016

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

Published on: March 3, 2023

相关概念视频

Genomic DNA in Prokaryotes

Genomic DNA in Prokaryotes

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...

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.