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Instability and site-specific excision of integration-proficient mycobacteriophage L5 plasmids: development of stably maintained integrative vectors


Springer, B; Sander, P; Sedlacek, L; Ellrott, K; Böttger, E C (2001). Instability and site-specific excision of integration-proficient mycobacteriophage L5 plasmids: development of stably maintained integrative vectors. International Journal of Medical Microbiology, 290(8):669-675.

Abstract

Integrative vectors expressing foreign genes are used as tools for the development of recombinant vaccines in mycobacteria since it is assumed that these vectors are stably maintained even without antibiotic selection. We here demonstrate that integration-proficient vectors are lost from the mycobacterial genome in high frequency. Loss of integrated vectors occurred in recA+ and in recA-strains, indicating a RecA-independent mechanism. Loss of the integrated vector was prevented when integrase gene function was carried on a separate plasmid that is unable to replicate in mycobacteria, indicating that excision is a function of integrase. By providing attP in cis and integrase function in trans, vectors integrating at the attB site are stably maintained, even when carrying genes that deleteriously affect the host.

Integrative vectors expressing foreign genes are used as tools for the development of recombinant vaccines in mycobacteria since it is assumed that these vectors are stably maintained even without antibiotic selection. We here demonstrate that integration-proficient vectors are lost from the mycobacterial genome in high frequency. Loss of integrated vectors occurred in recA+ and in recA-strains, indicating a RecA-independent mechanism. Loss of the integrated vector was prevented when integrase gene function was carried on a separate plasmid that is unable to replicate in mycobacteria, indicating that excision is a function of integrase. By providing attP in cis and integrase function in trans, vectors integrating at the attB site are stably maintained, even when carrying genes that deleteriously affect the host.

Citations

34 citations in Web of Science®
37 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Medical Microbiology
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2001
Deposited On:27 Mar 2009 08:01
Last Modified:05 Apr 2016 12:31
Publisher:Elsevier
ISSN:1438-4221
Official URL:http://www.elsevier.com/wps/find/journaldescription.cws_home/701772/description#description
PubMed ID:11310445

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