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Viral Replication: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects its...
Evolution of New Traits in Microbes01:24

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...
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
DNA Bacteriophages01:26

DNA Bacteriophages

Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
Evolutionary Processes in Microbes01:26

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...

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関連する実験動画

Updated: May 25, 2026

Following Cell-fate in E. coli After Infection by Phage Lambda
06:10

Following Cell-fate in E. coli After Infection by Phage Lambda

Published on: October 14, 2011

ファージ・ラムダの重要なイノベーションの進化における繰り返し性と偶然性

Justin R Meyer1, Devin T Dobias, Joshua S Weitz

  • 1Department of Zoology, Michigan State University, East Lansing, MI 48824, USA. justin.raymond.meyer@gmail.com

Science (New York, N.Y.)
|January 28, 2012
PubMed
まとめ

進化的革新は,ウイルスゲノムの変化と宿主の生態学的条件の複雑な相互作用から生じます. バクテリオファージ・ラムダは,宿主認識タンパク質を適応させることで,新しい感染経路を進化させ,新しい機能がどのように出現するかを実証しました.

科学分野:

  • 進化生物学の進化生物学について
  • ウイルス学 ウイルス学 ウイルス学
  • ゲノミクスゲノミクスとは

背景:

  • 系統に新しい機能と生態学的機会を与える重要なイノベーションの進化はよく理解されていません.
  • 進化的イノベーションの背後にあるメカニズムを理解することは,様々な生物学の分野にとって極めて重要です.

研究 の 目的:

  • 新しいメカニズムで宿主であるEscherichia coliに感染するバクテリオファージ・ラムダの進化経路を調査する.
  • 進化的イノベーションの出現におけるウイルスゲノム変異と宿主生態学的要因の相互作用を解明する.

主な方法:

  • バクテリオファージ・ラムダの宿主認識タンパク質J.の変異を調べた.
  • ホスト (Escherichia coli) の受容体発現 (LamBとOmpF) の変化を分析した.
  • ホストのゲノム変異がウイルス適応に与える影響を調査した.

主要な成果:

  • 自然選択は,タンパク質Jの変異を好み,元の受容体 (LamB) の適性を高めました.
  • これらの変異は,新しい受容体 (OmpF) 経由で感染への適応を容易にした.
  • ホストの進化 (LambB発現の減少) と特定のホストの変異は,ファグが新しい機能を獲得する能力に影響を与えた.

さらに関連する動画

A Practical Guide to Phage- and Robotics-Assisted Near-Continuous Evolution
05:08

A Practical Guide to Phage- and Robotics-Assisted Near-Continuous Evolution

Published on: January 12, 2024

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
08:31

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'

Published on: May 26, 2013

関連する実験動画

Last Updated: May 25, 2026

Following Cell-fate in E. coli After Infection by Phage Lambda
06:10

Following Cell-fate in E. coli After Infection by Phage Lambda

Published on: October 14, 2011

A Practical Guide to Phage- and Robotics-Assisted Near-Continuous Evolution
05:08

A Practical Guide to Phage- and Robotics-Assisted Near-Continuous Evolution

Published on: January 12, 2024

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
08:31

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'

Published on: May 26, 2013

結論:

  • 重要なイノベーションのウイルスの進化は,ゲノム学的プロセスと生態学的圧力の組み合わせによって引き起こされる.
  • バクテリオファージ・ラムダの適応は,新しい機能を獲得するための新しい経路を示し,ウイルスと宿主間のダイナミックな共同進化を強調しています.
  • この研究は,進化的イノベーションの形成における遺伝的変化と環境条件の複雑な関係を強調しています.