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Updated: May 27, 2026

Site-specific Bacterial Chromosome Engineering: ΦC31 Integrase Mediated Cassette Exchange (IMCE)

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Published on: March 16, 2012

Accumulative gene integration into a pre-determined site using Cre/loxP.

Hirokazu Obayashi¹, Yoshinori Kawabe, Hirokatsu Makitsubo

¹Graduate School of Systems Life Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

Journal of Bioscience and Bioengineering

|December 6, 2011

Summary

A simplified accumulative gene integration system (AGIS) allows repeated gene insertion into specific sites. This recombinase-mediated system efficiently integrates multiple genes into cellular genomes, enhancing transgene expression with increased copy numbers.

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Area of Science:

Molecular Biology
Genetics
Biotechnology

Background:

Site-specific recombination systems like Cre/loxP are crucial for genetic modification.
Previous accumulative gene integration systems (AGIS) utilized recombinase-mediated cassette exchange (RMCE) for repeated gene integration.
The need for simplified and efficient gene integration tools persists in research and applied fields.

Purpose of the Study:

To design and evaluate a simplified accumulative gene integration system (AGIS).
To demonstrate the efficiency of the simplified AGIS for multiple gene integrations in vitro and in cellular genomes.
To assess the impact of gene copy number on transgene expression using the simplified AGIS.

Main Methods:

Development of a simplified AGIS employing a single loxP site for gene integration.
In vitro gene integration experiments using Cre protein and engineered plasmids, repeated four times.
Genomic integration of reporter genes into Chinese hamster ovary (CHO) cells.

Main Results:

Successful repeated integration of four target genes in vitro via Cre-mediated recombination at the loxP site.
Efficient and Cre-dependent genomic integration of reporter genes into CHO cells.
Correlation observed between increased transgene copy number and enhanced reporter gene expression.

Conclusions:

The simplified recombinase-mediated AGIS is an effective tool for sequential gene integration.
This system facilitates efficient modification of cellular genomes with predictable gene expression outcomes.
The simplified AGIS offers a valuable advancement for genetic engineering applications.