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Related Experiment Videos

Differential cloning using in-gel competitive reassociation

H Yokota1, S Amano, T Yamane

  • 1Institute of Molecular and Cellular Biosciences, University of Tokyo, Japan.

Electrophoresis
|February 1, 1995
PubMed
Summary

This study presents a modified differential cloning method using in-gel competitive reassociation (IGCR) to enrich for rare DNA fragments. The technique successfully isolates altered DNA sequences present at low copy numbers in complex genomes.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Biotechnology

Background:

  • Cloning rare DNA fragments from complex genomes presents significant challenges due to low abundance.
  • Existing methods often lack the sensitivity to efficiently isolate DNA sequences present at one copy or less per genome.
  • Differential cloning strategies are crucial for identifying genomic variations like rearrangements and polymorphisms.

Purpose of the Study:

  • To describe a modified differential cloning procedure for isolating anonymous restriction DNA fragments with differing molecular sizes.
  • To achieve substantial enrichment of altered DNA fragments present at very low copy numbers (≤1 copy per genome) in higher organisms.
  • To adapt and improve the in-gel competitive reassociation (IGCR) technique for enhanced DNA fragment isolation.

Main Methods:

Related Experiment Videos

  • Utilized a modified differential cloning procedure based on in-gel competitive reassociation (IGCR).
  • Employed dissociation and reassociation of biotinylated restriction digests of target DNA in the presence of excess competitor DNA.
  • Incorporated solid-phase polymerase chain reaction (PCR) and streptavidin-based capture of target DNA fragments after gel electrophoresis.

Main Results:

  • Achieved substantial enrichment of altered DNA fragments originally present at one copy or less per mammalian genome.
  • Demonstrated the effectiveness of the modified IGCR procedure in isolating rare and specific DNA sequences.
  • Successfully isolated anonymous restriction DNA fragments differing between genomic DNA preparations.

Conclusions:

  • The modified differential cloning procedure significantly enhances the isolation of low-copy-number DNA fragments from complex genomes.
  • This technique is valuable for studying DNA rearrangements, polymorphisms, and other genomic variations.
  • The described method offers a robust approach for molecular cloning of rare genomic DNA sequences.