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関連する概念動画

Hepatitis01:25

Hepatitis

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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Viruses with RNA Genomes01:29

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Experimental RNAi

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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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MicroRNAs01:22

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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siRNA - Small Interfering RNAs02:30

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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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C型肝炎ウイルスのRNAは,機能的にmiR-12222を隔離する.

Joseph M Luna1, Troels K H Scheel2, Tal Danino3

  • 1Laboratory of Virology and Infectious Disease, Center for the Study of Hepatitis C, The Rockefeller University, New York, NY 10065, USA; Laboratory of Molecular Neuro-Oncology and Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065, USA.

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PubMed
まとめ

C型肝炎ウイルス (HCV) は,肝臓特異的なマイクロRNA-122 (miR-122) をハイジャックし,宿主標的に対する可用性を低下させます. HCV RNAによるこの封じ込めは,宿主遺伝子を抑制し,長期的な腫瘍性潜在能力を促進する可能性があります.

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科学分野:

  • ウイルス学 ウイルス学 ウイルス学
  • 分子生物学は分子生物学である.
  • 肝臓病理学 肝臓病理学

背景:

  • C型肝炎ウイルス (HCV) の複製は,肝臓特異のマイクロRNA-122 (miR-122) に依存しています.
  • ホストのトランスクリプトーム内の内生性マイクロRNA (miRNA) 標的に対するHCV感染の影響は,依然としてほとんど不明である.

研究 の 目的:

  • ホストのmiRNA標的,特にmiR-122.2によって調節される標的に対するHCV感染の全体的な影響を調査する.
  • HCV RNAがmiR-122と相互作用するメカニズムとその宿主遺伝子発現への影響を探求する.

主な方法:

  • HITS-CLIP (ハイ・スループット・シーケンシング・アンド・クロスリンクング・イムノプレシピテーション) は,感染中のHCV RNAとヒトトランスクリプトームのアルゴナウト (AGO) 結合部位をマッピングする.
  • HCVに感染した細胞におけるmiR-122標的のmRNAデ抑制の分析.
  • ウイルス miRNA の結合部位を交換することによって,ウイルス miRNA のトロピズムを実験的に操作する.
  • miR-122結合部位を含むレポーターシステムを用いた単細胞発現分析.
  • HCV誘発のmiR-122封じ込めのための定量的な数学モデルの開発.

主要な成果:

  • HCV 5' 未翻訳領域 (UTR) は,miR-122部位で強力なAGO結合を示し,直接の相互作用を示した.
  • HCV感染は,内生的なmiR-122標的に対するAGO結合の減少と,重要なmRNA抑制の減少につながった.
  • ウイルスのmiRNAトロピズムを変化させることで,miR-122からmiR-15.5のような他のmiRNAへの結合効果がシフトした.
  • 単細胞データは,HCV感染中のmiR-122標的の抑制抑制を確認し,発現レベルとmiR-122結合部位の数と相関しています.

結論:

  • HCV RNAは分子スポンジとして作用し,miR-122を隔離し,正常な機能を妨げます.
  • この封じ込めは,広範囲のホスト miR-122 ターゲットの抑制を解消する.
  • 研究では,このメカニズムは,がん原性細胞環境を作り出すことにより,慢性HCV感染の腫瘍原性可能性に寄与することが示唆されています.