関連する実験動画
Updated: Jul 14, 2026

10:40
Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods
Published on: December 21, 2019
人類のTRIM5alpha抗ウイルスタンパク質による絶滅したレトロウイルスの抑制
Shari M Kaiser1, Harmit S Malik, Michael Emerman
1Molecular and Cellular Biology Program, University of Washington, Seattle, WA 98195, USA.
まとめ
研究者は,古代のチンパンジーウイルスタンパク質を復活させた. 彼らは,ヒトのTRIM5alphaがこのウイルスをブロックできることを発見したが,進化的変化はHIV-1に対する感受性を増加させる可能性がある.
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:
- 霊長類のゲノムには内生レトロウイルスが含まれています.
- TRIM5alphaのようなタンパク質は,レトロウイルス感染症に対する固有の免疫を提供します.
- 宿主ウイルス相互作用の進化的動態は,免疫を理解するために重要である.
研究 の 目的:
- チンパンジーのゲノムから古代の内生レトロウイルスタンパク質を復活させ,特徴づけること.
- この復活したウイルスに対するヒトTRIM5alphaの抗ウイルス活性を調べるために.
- ヒトのTRIM5alphaにおける潜在的な進化的トレードオフを調査し,古代のウイルスに対する耐性を,HIV-1のような現代的なウイルスに対する感受性を授与する.
主な方法:
- 霊長類のゲノムに関するバイオ情報分析.
- 古代のウイルスタンパク質を再建するための遺伝子復活技術.
- TRIM5alphaの活性をテストするインビトロ抗ウイルス試験.
- TRIM5alpha進化の比較ゲノム解析について.
主要な成果:
- 400万年前のチンパンジーの内生ウイルスの核タンパク質が成功裏に復活しました.
- 人間のTRIM5alphaは,復活したウイルスによる感染を予防する活性を示した.
- ヒト特異的なTRIM5alphaの適応が,ヒト免疫不全ウイルス1型 (HIV-1) に対する感受性を無意識に増加させた可能性があるという証拠があります.
結論:
- 古代の内生レトロウイルスと宿主免疫との相互作用は,進化の歴史の洞察を提供します.
- 人間のTRIM5alphaは,特定の古代のウイルス脅威に抵抗するために進化しました.
- 古代のウイルスに対する耐性の進化的適応は,HIV-1のような現代のレトロウイルスに対する脆弱性を生み出したのかもしれない.
関連する概念動画
Retroviruses
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’...
Inhibitors of Virion Maturation and Assembly
As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
Retrovirus Life Cycles
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
Non-LTR Retrotransposons
As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
Inhibitors of Viral Protein Synthesis
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Viruses with RNA Genomes
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...

