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関連する概念動画

RNA Editing02:23

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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ミトコンドリアの塩基エディタは,実質的な核の標的外変異を誘導する.

Zhixin Lei1,2, Haowei Meng3, Lulu Liu3

  • 1Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China.

Nature
|May 13, 2022
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まとめ

DddA由来のサイトシンベースエディター (DdCBEs) はミトコンドリアDNAを編集できるが,核ゲノムに広範囲にわたる意図しない編集を引き起こす. 研究者は数百の非標的部位を特定し,一部の部位はTALE配列配列に依存し,他の部位はCTCF結合部位に関連している.

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科学分野:

  • 分子生物学
  • 遺伝学
  • バイオテクノロジー

背景:

  • DddA由来サイトシン塩基エディター (DdCBEs) は,ミトコンドリアDNAにおける標的型C•G-to-T•A変換のために設計されたタンパク質である.
  • DdCBEsの全ゲノム特異性と潜在的なオフターゲットの効果は,大部分が特徴づけられていない.

研究 の 目的:

  • DdCBEsの全ゲノム特異性を包括的に分析する.
  • 核とミトコンドリアDNAの両方のオフターゲットの編集イベントを識別し,特徴づけます.
  • 対象外編集の背後にあるメカニズムを調査し,緩和のための戦略を探求する.

主な方法:

  • DdCBEエディトームの全ゲノムにわたる無偏見分析
  • TALE配列配列 (TAS) に依存するサイトと,TAS に依存しないサイトを特定する.
  • CTCF結合部位やトポロジ的にドメインの境界を関連付けるようなゲノム特性の相対的な対象外部位の局所化の分析.

主要な成果:

  • DdCBEsは,核ゲノムで数百の特定されたサイトで,広範なオフターゲット編集を誘導します.
  • ターゲット外のサイトはTASに依存し,一部のサイトは単一のTALEの繰り返しで指定され,既存のモデルに挑戦します.
  • TAS独立の標的外サイトは,しばしば異なるDdCBEsで共有され,CTCFの結合サイトとTADの境界線と併設されます.

結論:

  • DdCBEの広範囲にわたる核非標的活動は,研究および治療上の応用のために慎重に評価する必要がある.
  • TASに依存した経路と独立した経路を含む非ターゲットの編集のメカニズムを理解することは極めて重要です.
  • ゲノム編集における安全で効果的な利用のために,DDCBEsの非標的効果を減らすためのエンジニアリングは不可欠です.