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Transcription-replication collision increases recombination efficiency between plasmids.

Li Jialiang1, Chen Feng, Xu Zhen

  • 1National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China; Guangzhou Fuda Cancer Hospital, No. 2, Tangdexi Road, Tang Xia, Tianhe District, Guangzhou City, Guangdong Province 510665, China.

Plasmid
|October 29, 2013
PubMed
Summary
This summary is machine-generated.

Transcription-replication collision (TRC) can impede DNA replication, increasing homologous recombination. This study shows TRC can repair mutant genes in plasmids via induced recombination.

Keywords:
CMVEGFPFCMHomologous recombinationRecombination frequencyReplicationTRCTranscriptionTranscription–replication collisioncytomegalovirusenhanced green fluorescent proteinflow cytometrytranscription–replication collision

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Area of Science:

  • Molecular Biology
  • Genetics
  • DNA Repair Mechanisms

Background:

  • Replication fork stalling is known to induce homologous recombination.
  • Arrested replication forks can serve as targets for nucleases, aiding double-strand break repair.

Purpose of the Study:

  • To investigate the potential of transcription-replication collision (TRC) to induce homologous recombination.
  • To determine if TRC can facilitate the repair of mutant genes within plasmids.

Main Methods:

  • Constructed a plasmid designed to induce TRC, where transcription and replication occur concurrently.
  • Created a second plasmid with a homologous sequence containing mutations.
  • Co-transfected both plasmids into 293T cells and analyzed recombination frequency and RAD51 expression.

Main Results:

  • Co-transfection of the plasmids led to a significant increase in recombination frequency.
  • The ratio of the two plasmids influenced the observed recombination frequency.
  • High expression levels of RAD51 were detected, suggesting the involvement of the homologous recombination pathway.

Conclusions:

  • Transcription-replication collision (TRC) effectively increases homologous recombination rates.
  • TRC-induced recombination can be utilized as a mechanism for repairing mutant genes in plasmids.