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CRISPR01:59

CRISPR

46.6K
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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Homologous Recombination02:31

Homologous Recombination

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
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CRISPR/Cas9 Genome Editing01:28

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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Genome Editing with CompoZr Custom Zinc Finger Nucleases ZFNs
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設計された亜鉛指核酵素を用いた高効率の内生的なヒト遺伝子修正です.

Fyodor D Urnov1, Jeffrey C Miller, Ya-Li Lee

  • 1Sangamo BioSciences, Inc., Pt. Richmond Tech Center 501, Canal Blvd, Suite A100 Richmond, California 94804, USA.

Nature
|April 5, 2005
PubMed
まとめ

この研究では,ヒトゲノムを正確に編集するための亜鉛指核酸を導入し,遺伝子治療の以前の制限を克服しました. この画期的な発見により,効率的な遺伝子修正が可能になり,遺伝疾患の治療への道が開けています.

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科学分野:

  • 遺伝学 遺伝学とは
  • 分子生物学は分子生物学である.
  • バイオテクノロジー バイオテクノロジー

背景:

  • 人間における恒久的なゲノム改変は,同類の再結合率が低いため,困難です.
  • この制限は,生物医学研究と効果的な遺伝子治療の開発を妨げています.

研究 の 目的:

  • 精密なin vivoゲノム改変のための一般的な解決策を開発する.
  • 遺伝子療法の適用のための同質再結合頻度を高めるために.

主な方法:

  • DNA認識のためにC2H2亜鉛指タンパク質を活用し,それを核酸ドメインで設計した.
  • ホモロジー指向修復を刺激するために誘発された標的DNAの二重鎖の断裂.
  • IL2Rgamma遺伝子のX関連重症結合免疫不全 (SCID) 変異を標的とした設計された亜鉛指核酶.

主要な成果:

  • 選択なしに遺伝子組み換えヒト細胞の18%以上を達成しました.
  • 約7%の細胞で,X染色体の両方を成功裏に改変することが示されています.
  • メッセンジャーRNAとタンパク質レベルでの正確な遺伝子型反射が観察されました.
  • 人間のT細胞で報告された高変異頻度.

結論:

  • 亜鉛指核酸は,正確なヒトゲノム編集のための実行可能な戦略を提供します.
  • この技術は,遺伝的疾患に対する新しい遺伝子治療の開発に希望を示しています.
  • このアプローチは,in vivo遺伝子修正および疾患治療の可能性を大幅に高めています.