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Related Concept Videos

Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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.
The recognition sites for Cre recombinase called LoxP...

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Related Experiment Video

Updated: May 15, 2026

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
11:27

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

Published on: September 18, 2019

Improved methods for creating migratable Holliday junction substrates.

Stefanie Hartman Chen1, Jody L Plank, Smaranda Willcox

  • 1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.

Nucleic Acids Research
|January 1, 2013
PubMed
Summary
This summary is machine-generated.

Researchers improved a method for creating DNA substrates used in studying homologous recombination. New techniques simplify single-stranded DNA production and DNA recovery, enabling easier generation of complex DNA structures for research.

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Last Updated: May 15, 2026

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • A previously published method created a novel double Holliday junction DNA substrate.
  • This substrate is valuable for in vitro studies of late-stage homologous recombination.
  • Substrate construction presented significant challenges, including DNA production and recovery.

Purpose of the Study:

  • To address limitations in the existing double Holliday junction substrate creation protocol.
  • To optimize the production of single-stranded DNA, improve DNA recovery post-recombination, and enhance gel extraction efficiency.

Main Methods:

  • Implemented a helper plasmid system for single-stranded DNA production.
  • Utilized the unidirectional C31 integrase system instead of the bidirectional Cre recombinase.
  • Adopted DNA diffusion for more efficient gel extraction.

Main Results:

  • Successfully modified the protocol to overcome previous bottlenecks.
  • Characterized the production of various DNA substrates, including single Holliday junctions, hemicatenanes, and a quadruple Holliday junction substrate.
  • Demonstrated improved efficiency in DNA substrate generation.

Conclusions:

  • The revised protocol significantly simplifies the creation of complex DNA substrates for homologous recombination studies.
  • The optimized methods facilitate the production of diverse Holliday junction-containing DNA structures.
  • These improvements enhance the accessibility and efficiency of studying DNA recombination processes.