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関連する概念動画

CRISPR and crRNAs02:53

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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.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
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Functions are fundamental mathematical tools that capture relationships between variables and describe how one quantity changes in relation to another. Their diverse forms allow them to model various real-world phenomena with precision and flexibility. Among the various categories, algebraic functions are prominent due to their formulation through basic arithmetic operations: addition, subtraction, multiplication, division, and root extraction.Algebraic functions include polynomial, rational,...
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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Trigonometric and exponential functions are essential mathematical tools used to model distinct types of real-world behavior, particularly in periodic and growth-related phenomena. These functions extend the capabilities of basic algebraic models by capturing recurring cycles and rapid changes across various scientific and engineering contexts.Trigonometric functions, such as sine and cosine, are particularly effective for representing periodic phenomena. Their cyclic behavior makes them...
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Logarithmic and piecewise functions play central roles in mathematical modeling, particularly when capturing nonlinear or segmented behaviors in real-world phenomena. Although these functions differ fundamentally in structure and application, both serve to represent complex relationships in simplified mathematical terms.A logarithmic function is defined as the inverse of an exponential function, expressed as These functions grow quickly for small values of x but slow down as x increases,...
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Substrate Generation for Endonucleases of CRISPR/Cas Systems
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機能的に多様なタイプVのCRISPR-Casシステム

Winston X Yan1, Pratyusha Hunnewell1, Lauren E Alfonse1

  • 1Arbor Biotechnologies, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|December 8, 2018
PubMed
まとめ
この要約は機械生成です。

研究者は新しいタイプVのCRISPR-Casシステムを調査し,Cas12c,Cas12g,Cas12h,Cas12iを特定しました. これらのシステムは 多様なDNAとRNAの標的化能力を示し,分子生物学アプリケーションの CRISPR ツールボックスを拡張しています.

さらに関連する動画

Precise Phage Mutagenesis with NgTET-Assisted CRISPR-Cas Systems
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関連する実験動画

Last Updated: Feb 1, 2026

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科学分野:

  • 分子生物学
  • 遺伝学
  • 生物化学

背景:

  • タイプVのCRISPR-Casシステムは,RNA誘導型DNAターゲティングのために単一のエフェクタータンパク質,Cas12を使用します.
  • Cas12aとCas12bはよく特徴づけられているが,他のCas12サブタイプは未調査であり,機能的な多様性を暗示している.
  • 特徴づけられていない Cas12 タンパク質の独特のドメイン構造と RuvC 配列は,新しい活動を示唆する.

研究 の 目的:

  • タイプVのCRISPR-Casシステムから新しいCas12タンパク質を特定し,特徴づけること.
  • 新たに特定されたCas12亜型の機能的多様性と酵素的活動を調査する.
  • ゲノム編集と分子応用のためのCRISPR-Casツールのレパートリーを拡大する.

主な方法:

  • 特徴づけられていないCas12タンパク質の生物情報識別
  • Cas12c,Cas12g,Cas12h,Cas12iの生化学的特徴について
  • RNA誘導DNA干渉,RNase,およびDNase活動を決定するアッセイ.

主要な成果:

  • Cas12c,Cas12h,Cas12iはRNA誘導の二重鎖DNA (dsDNA) 干渉を示しています.
  • Cas12iは補完鎖の好ましい裂け目を示し,dsDNAのニッキングにつながります.
  • Cas12gはRNA誘導リボヌクレアース (RNase) として機能し,RNaseと単一鎖DNaseの活動がある.

結論:

  • この研究は,異なる進化の経路によって引き起こされる,タイプVのCRISPR-Casシステム内の重要な機能的多様性を明らかにしています.
  • 新しく特徴づけられた Cas12 タンパク質は CRISPR 技術の能力を拡張します
  • これらの発見は,分子生物学とバイオテクノロジーの多様な応用のための新しいツールを提供します.