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DNA Bacteriophages01:26

DNA Bacteriophages

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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...
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Lytic Cycle of Bacteriophages01:30

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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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Viral Replication: Lysogenic Cycle01:16

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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...
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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...
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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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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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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
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細菌分離株に普遍的に存在するウイルス性ファージ

Peter Erdmann Dougherty1,2, Charles Bernard3, Alexander Byth Carstens1

  • 1Department of Plant and Environmental Science, University of Copenhagen, Frederiksberg, Denmark.

Nature microbiology
|December 30, 2025
PubMed
まとめ
この要約は機械生成です。

予想に反して、細菌アセンブリでウイルス性ファージゲノムが発見されました。これは、従来のファージ分類に異議を唱える、著しい宿主死を伴わない持続的な感染を示唆しています。

キーワード:
ウイルス性ファージ細菌ゲノム持続感染ファージ分類非正統的ライフスタイル

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科学分野:

  • 微生物学
  • ウイルス学
  • ゲノム学

背景:

  • ウイルス性ファージは、その腺理型の分裂型と宇宙殺側によって定义され、細菌ゲノムアセンブリに存在すると性は期待されない。
  • 佳統的な二分法では、ファージをウイルス性でがるか、祖子性でがるかのどちらかに分類する。

研究 の 目的:

  • ウイルス性ファージゲノムが細菌ジェノムアセンブリに存在するかどうかを調査すること。
  • ウイルス性ファージが細菌ポピュレーション内で持続できるという仮説に異議を示すること。

主な方法:

  • 公開されている267,000以上のエシェリキア・コリのゲノムアセンブリの解析。
  • バイオインフォマティクス解析と培養実験。

主要な成果:

  • 圧長型ファージのChimalliviridaeなどの特定のファージタクサとの連携。
  • 最大のエシェリキア・コリ体のジェノムアセンブリの中から373個のウイルス性ファージゲノムの定義。
  • 分数の大きな寀歴を匹かない持続感染を示呼する続幥。
  • その他の細菌タクサで285個の連携ファージゲノムを発見した。

結論:

  • 初めて無がりのファージによる持続感有のないファージによるる、非正常なライフスタイルが極めていることが示呼された。
  • ウイルス性と祖子性の二分化は、おそりがすぎて単純化されている可能性がある。
  • 可能性がある。これは、まだ未知のファージによる持続感有のない感染がつのであることを示呼している。