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The DNA Replication Fork01:02

The DNA Replication Fork

An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
DNA-only Transposons02:57

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
The DNA Replication Fork01:02

The DNA Replication Fork

An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...

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Updated: May 29, 2026

Design and Synthesis of a Reconfigurable DNA Accordion Rack
07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

単一鎖DNAトランポジションは,宿主複製と結合して複製される.

Bao Ton-Hoang1, Cécile Pasternak, Patricia Siguier

  • 1Laboratoire de Microbiologie et Génétique Moléculaires, Centre National de Recherche Scientifique, Unité Mixte de Recherche 5100, 118 Route de Narbonne, F31062 Toulouse Cedex, France. bao.tonhoang@ibcg.biotoul.fr

Cell
|August 10, 2010
PubMed
まとめ
この要約は機械生成です。

トランポゾン運動,特に挿入配列 (ISs) は,DNA複製フォークと関連しています. 複製の方向と停滞したフォークは,IS608とISDra2の転移に影響を与え,プロカリオットの進化に影響を与えます.

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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
09:32

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

関連する実験動画

Last Updated: May 29, 2026

Design and Synthesis of a Reconfigurable DNA Accordion Rack
07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
09:32

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

科学分野:

  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは
  • 進化生物学の進化生物学について

背景:

  • DNAの転移は,プロカリオットとユーカリオットの進化の主要な原動力である.
  • 挿入配列 (IS) は,その構造と転置メカニズムによって分類される単純な原生体トランポゾンである.
  • IS200/IS605ファミリーは,トランポジション中に単一鎖DNA中間物質を使用しています.

研究 の 目的:

  • IS608とISDra2の転移と宿主複製フォークの関係について調査する.
  • IS切除における複製方向の役割を決定する.
  • IS挿入を特定のゲノム位置に誘導する可能性を調査する.

主な方法:

  • IS608とISDra2のトランスポーゼーションの実験分析.
  • ヘリコース関数とオカザキ断片合成を含む複製フォークダイナミクスの操作.
  • インシリコゲノム分析で,IS200/IS605ファミリーメンバーの流行と分布を評価する.

主要な成果:

  • IS608とISDra2のトランスポーゼーションは,ホスト複製フォークと直接関連しています.
  • 最大のIS切除は",上部"のISストランドが遅滞ストランドテンプレートにあるときに起こります.
  • IS切除は,複製ヘリカーゼの一時的な無活性化またはオカザキ断片合成の抑制によって強化されます.
  • IS608の挿入は,レイギングストランドのテンプレートに対するオリエンテーションの好みを示し,停滞したレプリケーションフォークに誘導することができます.

結論:

  • 複製の方向とフォークの状態は,IS200/IS605ファミリーのトランスポーゼーションを決定的に影響します.
  • ISの転置メカニズムは宿主DNA複製プロセスと統合されています.
  • この統合は,IS要素の普及と進化の影響を容易にする可能性がある.