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関連する概念動画

Nociception01:44

Nociception

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Transducer Mechanism: G Protein–Coupled Receptors01:30

Transducer Mechanism: G Protein–Coupled Receptors

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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical,...
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Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

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Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Pain01:20

Pain

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Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
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Counterfactual Thinking01:19

Counterfactual Thinking

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Counterfactual thinking is a cognitive process wherein individuals mentally reconstruct alternative versions of past events, often beginning with “what if” or “if only.” This reflective mechanism plays a significant role in shaping emotional experiences and guiding future behavior. Though typically triggered by unfavorable or unexpected outcomes, counterfactual thinking can also emerge in mundane, everyday decisions and experiences, revealing its deep entrenchment in...
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Real-time Quaking-induced Conversion Assay for Detection of CWD Prions in Fecal Material
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無意味なコドンを,標的型の偽ウリジリレーションによって感覚コドンに変換する.

John Karijolich1, Yi-Tao Yu

  • 1Department of Biochemistry and Biophysics, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, New York 14642, USA.

Nature
|June 17, 2011
PubMed
まとめ

無意味なコドンの偽ウリジル化は,翻訳終結を抑制し,標的のアミノ酸の挿入を可能にします. このRNAの改変は,コードンの意味を変えることで遺伝コードを拡張し,新しい解読機構を提供します.

科学分野:

  • 分子生物学は分子生物学である.
  • RNA Modification RNA ModificationRNAの改変は,RNAをRNAに変えて,RNAをRNAに変えて,RNAをRNAに変えて作られている.
  • 遺伝子コードは遺伝子コードです.

背景:

  • 無意味なコドン (UAA,UAG,UGA) 信号翻訳の終結.
  • ウリジンは,3つのナンセンスコドンすべてで最初の塩基である.
  • RNAの偽ウリジル化は,ウリジンを偽ウリジン (Ψ) に変更する.

研究 の 目的:

  • ナンセンスコドンに対する偽ウリジリレーションの効果を調査する.
  • 無意味な抑制のための偽ウリジル化の可能性を in vivo で探求する.
  • 偽ウリジル化ナンセンスコドンが特定のアミノ酸をコードできるかどうかを判断する.

主な方法:

  • トランスレーション終了を評価するためのインビトロおよびインビボアッセイ.
  • H/ACA RNAの発現は,ナンセンス・コドンの直接的な偽ウリジル化を誘導する.
  • 偽ウリジル化コドン部位におけるアミノ酸組み込みの分析.

主要な成果:

  • 無意味なコドンの偽ウリジル化は,翻訳終了を抑制する.
  • 標的型偽ウリジリレーション in vivoは,早期停止を防ぐことができます.

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  • 偽ウリジル化コドン (ΨAA, ΨAG, ΨGA) は,特定のアミノ酸 (セリン,スレオニン,チロシン,フェニララニン) をコードする.

    • 結論:

    • 標的型偽ウリジリレーションは,ナンセンス抑制のための新しい戦略です.
    • 偽ウリジル化ナンセンスコドンは,遺伝子コードの解読の新しいモードを表しています.
    • RNAの改変は,遺伝コードを拡張するための経路を提供します.