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相关概念视频

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

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相关实验视频

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

单链DNA转换与宿主复制结合在一起.

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
概括
此摘要是机器生成的。

转子子运动,特别是插入序列 (ISs),与DNA复制分叉有关. 复制的方向和停滞的分叉影响IS608和ISDra2转移,影响 prokaryotic 进化.

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相关实验视频

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

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 进化生物学 进化生物学

背景情况:

  • DNA转换是原核生物和真核生物进化的关键驱动力.
  • 插入序列 (ISs) 是简单的 prokaryotic 转位子,根据它们的结构和转位机制进行分类.
  • 在转换过程中,IS200/IS605家族使用单链DNA中间体.

研究的目的:

  • 为了研究IS608和ISDra2转换和宿主复制叉之间的关系.
  • 为了确定复制方向在IS切割中的作用.
  • 探索将IS插入定向到特定基因组位置的潜力.

主要方法:

  • 对IS608和ISDra2转换的实验分析.
  • 对复制分叉动态的操纵,包括螺旋酶功能和奥卡扎基片段合成.
  • 在基因组分析中评估IS200/IS605家族成员的流行率和分布.

主要成果:

  • 转换IS608和ISDra2与宿主复制分叉直接相关.
  • 当"顶部"IS链在落后链模板上时,就会发生最大IS切除.
  • 通过短暂无活化复制性酶或抑制奥卡扎基片段合成来增强IS切除.
  • IS608插入显示偏向偏向滞后链模板,可以引导到停滞的复制叉.

结论:

  • 复制方向和分叉状态极大地影响IS200/IS605家族的转换.
  • IS转换机制与宿主DNA复制过程相集成.
  • 这种整合可能会促进IS元素的传播和进化影响.