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Related Concept Videos

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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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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DNA Distortion and Damage
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Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
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Related Experiment Video

Updated: Oct 25, 2025

Site-specific Bacterial Chromosome Engineering: ΦC31 Integrase Mediated Cassette Exchange (IMCE)
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Efficient retroelement-mediated DNA writing in bacteria.

Fahim Farzadfard1, Nava Gharaei2, Robert J Citorik1

  • 1Synthetic Biology Group, Research Laboratory of Electronics, Department of Electrical Engineering & Computer Science and Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA; MIT Synthetic Biology Center, 500 Technology Square, Cambridge, MA 02139, USA; MIT Microbiology Graduate Program, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Cell Systems
|August 6, 2021
PubMed
Summary

Scientists developed a new DNA writing system using retroelements for precise bacterial genome editing. This technology allows for efficient, in situ modifications without target-specific elements, enabling new applications in cell biology and trait evolution.

Keywords:
DNA memoryDNA writingcellular connectome mappingediting microbial communities in situin vivo evolution

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Area of Science:

  • Synthetic biology
  • Microbial genetics

Background:

  • Current bacterial genome editing tools (recombineering) have limitations in efficiency and applicability.
  • Existing methods often require specific laboratory conditions and are not suitable for in situ applications.

Purpose of the Study:

  • To engineer a novel DNA writing system for efficient and precise bacterial genome editing.
  • To overcome the limitations of current recombineering platforms.

Main Methods:

  • Development of a retroelement-mediated DNA writing system.
  • Demonstration of editing capabilities without target-specific elements or selection.

Main Results:

  • Achieved efficient, scarless, and cis-element-independent editing of microbial genomes.
  • Successfully mapped spatial information and cellular interactions into DNA memory.
  • Enabled continuous evolution of cellular traits.

Conclusions:

  • The retroelement-mediated DNA writing system offers a powerful tool for bacterial genome engineering.
  • This platform supports diverse applications, including in situ editing within complex communities and high-throughput functional mapping.