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関連する概念動画

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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Lysogenic Cycle of Bacteriophages00:43

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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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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.
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Retroviruses02:33

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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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逆の動きでファージを騙す

Ilya Osterman1, Rotem Sorek1

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.

Science (New York, N.Y.)
|August 29, 2024
PubMed
まとめ
この要約は機械生成です。

新しい抗ウイルス遺伝子はDNAに含まれていないが,活発に発現している. この発現は ロールリング・サークル・リバース・トランスクリプションと呼ばれる ユニークなプロセスを経て発生し 抗ウイルスメカニズムに関する新しい洞察を 提供します

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Following Cell-fate in E. coli After Infection by Phage Lambda
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Last Updated: Jun 14, 2025

Phage-Mediated Genetic Manipulation of the Lyme Disease Spirochete Borrelia burgdorferi
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Following Cell-fate in E. coli After Infection by Phage Lambda
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科学分野:

  • 分子生物学
  • ウイルス学
  • 遺伝学

背景:

  • 分子生物学の中心的な教義は,通常,RNAとタンパク質の合成のテンプレートとしてDNAを記述しています.
  • 遺伝子の発現は通常,遺伝子をコードするDNA配列の存在に依存する.
  • 異質な遺伝子発現メカニズムは 伝統的な生物学的な理解に 挑戦しています

研究 の 目的:

  • 抗ウイルス遺伝子の発現を 調べるため
  • DNAテンプレートがない場合の遺伝子発現の仕組みを明らかにする.
  • 抗ウイルス防御における ローリングサークルの逆転転写の役割を理解するためです

主な方法:

  • ウイルスゲノムと染色体外DNAの分析
  • RNAトランスクリプトの検出と特徴付け
  • ローリングサークルの逆転転写活動の実験的検証
  • 遺伝子機能を評価する抗ウイルス検査

主要な成果:

  • 抗ウイルス遺伝子が特定され,発現することが確認されました.
  • この抗ウイルス遺伝子の対応するDNA配列は宿主またはウイルスゲノムで発見されなかった.
  • 抗ウイルス遺伝子の発現メカニズムとして,ローリングサークルの逆転転写が示されました.
  • 発現した抗ウイルス遺伝子は特定の病原体に対して有意な抗ウイルス活性を示した.

結論:

  • 遺伝子発現は DNA テンプレートから独立して 代替メカニズムによって起こる.
  • ロールリング・サークル逆転写は機能的な抗ウイルス分子を生成するための新しい経路を表しています.
  • この発見により 遺伝情報の流れや ウイルス対策の戦略の理解が広がりました