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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Site-specific DNA Inversion by Serine Recombinases.

Reid C Johnson1

  • 1Department of Biological Chemistry, UCLA School of Medicine, Los Angeles, CA 90095-1737, .

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PubMed
Summary
This summary is machine-generated.

Site-specific DNA inversion, mediated by serine recombinases, controls cell surface molecule alterations and host range in bacteria and phages. The Fis/enhancer system precisely regulates these programmed DNA rearrangements.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Reversible site-specific DNA inversion is crucial for bacterial and viral adaptation.
  • These reactions alter cell surface molecules or phage host range.
  • Dedicated recombinases, not general repair machinery, catalyze DNA inversions.

Purpose of the Study:

  • To discuss serine recombinase-mediated DNA inversion.
  • To focus on Fis/enhancer-dependent serine invertases.
  • To review recent advances in understanding these systems.

Main Methods:

  • Summarizing biological features of Fis/enhancer-dependent and Bacteroides serine invertases.
  • Discussing mechanistic studies of Hin and Gin invertases.
  • Analyzing the role of the Fis/enhancer regulatory system and invertasome assembly.

Main Results:

  • Fis/enhancer system stringently controls DNA inversion.
  • Understanding of invertasome assembly and DNA strand exchange has advanced.
  • DNA topological forces bias inversion over deletion and intermolecular recombination.

Conclusions:

  • Serine recombinases and regulatory systems like Fis/enhancer are key to programmed DNA rearrangements.
  • Detailed mechanistic insights into invertasome function have been gained.
  • DNA topology plays a critical role in directing site-specific DNA inversion.