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Conservative Site-specific Recombination and Phase Variation02:53

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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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Temperature-Dependent Recombinase-Based Genetic Circuits.

Marc Gonzalez-Colell1, Mariana Gomes Del Castillo1, Marta Palau Gauthier1

  • 1Synthetic Biology for Biomedical Applications Lab, Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Biomedical Research Park, 08003 Barcelona, Spain.

International Journal of Molecular Sciences
|December 30, 2025
PubMed
Summary
This summary is machine-generated.

Scientists engineered temperature-controlled genetic circuits using RNA thermometers and DNA recombinases for precise gene expression. This system offers irreversible control and has applications in synthetic biology and biosensing.

Keywords:
RNA thermometerscellular patterningcircuitsrecombinaseregulationsynthetic biologytemperature-dependent

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Area of Science:

  • Synthetic Biology
  • Genetic Engineering
  • Molecular Biology

Background:

  • Temperature is a key environmental signal that can influence cellular processes.
  • Precise and irreversible control of gene expression is crucial for synthetic biology applications.

Purpose of the Study:

  • To engineer and characterize novel temperature-dependent genetic circuits.
  • To achieve precise, irreversible control of gene expression using temperature as a trigger.
  • To explore applications of these circuits in various biological contexts.

Main Methods:

  • Integration of RNA thermometers with site-specific DNA recombinases (e.g., Bxb1).
  • Characterization of thermal sensitivity based on promoter strength.
  • Investigation of temperature pulse duration and cell growth phase effects on recombination efficiency.

Main Results:

  • Demonstrated promoter strength's critical role in defining thermal sensitivity and ON/OFF transitions.
  • Showcased modulation of recombination efficiency by temperature pulse duration and cell growth phase.
  • Developed proof-of-concept applications including spatial expression patterns, a paper-based temperature recorder, and a triggered lysis system.

Conclusions:

  • Temperature-regulated recombinase circuits provide versatile and robust tools for programmable gene expression.
  • These circuits enable spatially resolved and irreversible genetic control.
  • The developed framework opens new avenues for synthetic biology, biosensing, and bioproduction.