関連する実験動画
Updated: Apr 11, 2026

11:29
Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain
Published on: October 3, 2012
11.3K
人間のプリオンタンパク質の自然発生の変種は,プリオン病を完全に予防します
Emmanuel A Asante1, Michelle Smidak1, Andrew Grimshaw1
1MRC Prion Unit, Department of Neurodegenerative Disease, UCL Institute of Neurology, London WC1N 3BG, UK.
Nature
|June 11, 2015
まとめ
G127Vプリオンタンパク質 (PrP) 変種は, kuru と Creutzfeldt-Jakob 病 (CJD) などのプリオン疾患に対して完全な耐性を提供しています. この変異種はまた,他のプリオン菌株の伝播を強力に抑制します.
科学分野:
- 神経変性疾患は,神経変性疾患である.
- プリオン生物学のプリオン生物学
- 進化遺伝学の進化遺伝学について
背景:
- 哺乳類のプリオンとは,誤ったプリオンタンパク質 (PrP) アセンブリであり,致命的な神経変性疾患を引き起こす.
- G127V PrP変種は, kuru 流行の間に陽性選択によって発生し,ヘテロジゴトに保護を提供しました.
- G127V変異は,M129 PRNPアレルにのみ存在します.
研究 の 目的:
- G127V PrP変異の保護的役割を調査する.
- G127VとM129VのPrPポリモルフィズムとの相互作用を検証する.
- G127V媒介のプリオン抵抗のメカニズムを決定する.
主な方法:
- 人間のPrP変種 (G127Vおよび野生型) を発現するトランスジェニックマウスモデル.
- kuru,古典的なクレッツフェルト・ヤコブ病 (CJD),および変異型CJDプリオンを用いた感染研究.
- 異なるPrP表現比におけるプリオン変換と伝播の分析.
主要な成果:
- G127Vと野生型のPrPの両方を発現するトランス遺伝子マウスは, kuruと古典的なCJDプリオンに抵抗しました.
- G127V PrPのみを発現したマウスは,テストされたすべてのプリオン株に耐性を示した.
- G127V PrPはプリオン変換に耐火性であり,野生型のプリオン伝播を線量依存的に抑制する.
結論:
- G127V PrPの変種は,プリオン病に対する強固で株特有の耐性を提供します.
- G127Vは,M129Vのポリモルフィズムと比較して,異なるメカニズムを通じて保護を提供します.
- G127Vは,プリオン伝播の強力な阻害剤として作用し,潜在的な治療目標を提供します.
関連する概念動画
Amyloid Fibrils
13.1K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
13.1K
Subviral Agents
853
Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
853
Nonsense-mediated mRNA Decay
12.2K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
12.2K
RNA Splicing
61.8K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
61.8K
Leaky Scanning
5.9K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.9K

