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In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression
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IS-linked movement of a restriction-modification system.

Noriko Takahashi1, Seishi Ohashi, Marat R Sadykov

  • 1Laboratory of Social Genome Science, Department of Medical Genome Sciences, Graduate School of Frontier Science, University of Tokyo, Minato-ku, Tokyo, Japan.

Plos One
|February 10, 2011
PubMed
Summary

This study shows restriction-modification systems can move within a genome in vivo. Their integration into the chromosome is facilitated by mobile insertion sequences in bacteria.

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Restriction-modification (R-M) systems are crucial for bacterial defense and genome regulation.
  • Previous evolutionary analyses suggested potential mobility of R-M systems within prokaryotic genomes.

Purpose of the Study:

  • To demonstrate the in vivo movement of a specific R-M system (PaeR7I) within the genome of Escherichia coli under laboratory conditions.
  • To investigate the mechanisms and products of R-M system integration into the bacterial chromosome.

Main Methods:

  • Utilized a temperature-sensitive plasmid carrying the PaeR7I R-M system in E. coli.
  • Blocked plasmid replication to induce chromosomal integration.
  • Performed sequence analysis to characterize the integration products and identified the role of insertion sequences (ISs).
  • Conducted reconstruction experiments to assess the impact of R-M system activity on integration efficiency.

Main Results:

  • The PaeR7I R-M system successfully integrated into the E. coli chromosome after blocking plasmid replication.
  • Integration predominantly occurred via co-integration with chromosomal insertion sequences (IS1 or IS5).
  • Alternative integration mechanisms included de novo IS1 insertion and reciprocal crossing-over.
  • An R-negative mutation significantly reduced integration efficiency, indicating restriction-dependence.
  • Selection against non-integrated cells, due to restriction enzyme activity, favored proper integration.

Conclusions:

  • Demonstrates the in vivo mobility of R-M systems, facilitated by mobile genetic elements like ISs.
  • Highlights a collaborative mechanism between R-M systems and mobile elements for genome integration and spread.
  • Suggests this collaboration may be a key factor in the persistence and wide distribution of R-M systems in prokaryotes.