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Updated: Aug 12, 2026

Site-specific Bacterial Chromosome Engineering: ΦC31 Integrase Mediated Cassette Exchange (IMCE)
Published on: March 16, 2012
A Brevibacterium lactofermentum 16S rRNA gene used as target site for homologous recombination
E Amador1, J F Martín, J M Castro
1Area of Microbiology, Department of Ecology, Genetics and Microbiology, Biology Faculty, University of León, 24071, León, Spain.
Abstract:
Genes for rRNA are highly conserved and present in multiple copies in most prokaryotic organisms increasing the number of theoretical sites for homologous recombination. They might be targets for integration events between unrelated microorganisms providing that an efficient genetic transfer is present. We have used a plasmid containing a portion of the 16S rRNA gene from the rrnD operon of Brevibacterium lactofermentum to transform the same strain resulting in non-essential inactivation of various rrn operons. Integration of the transforming DNA occurs in all cases. The system may be used to test possible gene transfer at least among closely related strains and is of great interest for integration of foreign DNA and for mapping.
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