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Updated: Jun 16, 2026
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Site-specific Bacterial Chromosome Engineering: ΦC31 Integrase Mediated Cassette Exchange (IMCE)
Published on: March 16, 2012
Transgene excision from wheat chromosomes by phage phiC31 integrase
Katja Kempe1, Myroslava Rubtsova, Carolin Berger
1Leibniz-Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK) Gatersleben, Corrensstr. 3, 06466, Gatersleben, Germany.
Plant Molecular Biology
|February 4, 2010
Summary
The phiC31 integrase system precisely excises DNA from wheat chromosomes via site-specific recombination. This genetic tool enables targeted DNA removal in plants, confirmed through molecular analysis and inheritance studies.
Area of Science:
- Plant Biotechnology
- Molecular Biology
- Genetics
Background:
- Site-specific recombination is crucial for precise DNA manipulation in eukaryotic genomes.
- The phiC31 integrase system, derived from Streptomyces phage, is known for its efficiency in mediating recombination.
Purpose of the Study:
- To evaluate the efficacy of the phiC31 integrase system for excising transgenic DNA from the wheat genome.
- To demonstrate the potential of this system as a tool for targeted DNA sequence elimination in plants.
Main Methods:
- Generating transgenic wheat lines expressing phiC31 integrase.
- Crossing these lines with plants containing a target DNA construct with phiC31 recognition sites (attP and attB).
- Analyzing progeny using PCR, Southern blotting, and sequencing to confirm DNA excision and characterize recombinant loci.
Main Results:
- Successful excision of intervening DNA mediated by phiC31 recombinase in 34 independent wheat lines.
- Confirmation of recombination events through molecular analyses and sequencing of excision footprints.
- Demonstrated stable inheritance of recombinant loci to subsequent generations.
Conclusions:
- The phiC31 integrase-att system is effective for site-specific DNA excision in the wheat genome.
- This system offers a precise method for removing unwanted DNA sequences from plant chromosomes.
- The findings establish a valuable tool for advanced plant genetic engineering and crop improvement.
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