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Antibiotic Selection00:57

Antibiotic Selection

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Overview
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Development of Antibiotic Resistance

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Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
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Microbiology, a scientific field dedicated to the study of microorganisms, has undergone profound development since its inception in the 17th century. Its history is marked by key discoveries and technological advancements that have shaped our understanding of life at the microscopic level and transformed medicine, agriculture, and industry.Early Foundations of MicrobiologyThe early foundations of microbiology were built on groundbreaking observations and the development of pioneering...
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Transformation

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Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
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Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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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...
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抗生素景观上的时空微生物进化

Michael Baym1, Tami D Lieberman1, Eric D Kelsic1

  • 1Department of Systems Biology, Harvard Medical School, Boston, MA, USA.

Science (New York, N.Y.)
|September 10, 2016
PubMed
概括

细菌在一个大范围的抗生素环境中进化,呈现出持续的抗药性增长,同时也呈现出血统多样化. 在这种微生物进化研究中,高耐药性突变可以被低耐药性突变所超越.

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科学领域:

  • 微生物学
  • 进化生物学
  • 遗传学

背景情况:

  • 细菌的生存取决于在不断变化的环境中迁移的进化.
  • 传统的实验室实验通常使用混合系统,限制了空间演变的研究.
  • 在复杂的景观中实时可视化细菌适应是一项挑战.

研究的目的:

  • 引入和验证一种新的实验装置,即微生物进化和生长场 (MEGA) 板.
  • 在大规模的抗生素环境中研究细菌的进化和适应.
  • 通过视觉观察细菌前线的突变和选择动态.

主要方法:

  • 开发MEGA板,一个120 × 60厘米的装置用于细菌进化实验.
  • 在抗生素渐变的景观上培养细菌.
  • 在繁殖前面和后面视觉观察和分析细菌突变.

主要成果:

  • 在整个景观中观察到细菌耐药性的持续增加.
  • 多种细菌系在表型和基因型上都有多样化.
  • 高度抗性突变物有时被超越并被困在不太抗性血统后面.

结论:

  • MEGA板是研究微生物适应的一个多功能平台.
  • 包括非线性选择在内的进化动态可以直接可视化.
  • 空间结构显著影响细菌进化和血统共存的轨迹.