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Infection and Immunity, March 2000, p. 1297-1303, Vol. 68, No. 3
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Identification of Brucella suis Genes Affecting Intracellular Survival in an In Vitro Human Macrophage Infection Model by Signature-Tagged Transposon Mutagenesis

Vincent Foulongne, Giséle Bourg, Chantal Cazevieille, Sylvie Michaux-Charachon, and David O'Callaghan*

INSERM U431, Faculté de Médecine, 30900 Nîmes, France

Received 7 October 1999/Returned for modification 22 November 1999/Accepted 6 December 1999

Bacteria of the genus Brucella are facultative intracellular pathogens which have developed the capacity to survive and multiply in professional and nonprofessional phagocytes. The genetic basis of this aspect of Brucella virulence is still poorly understood. To identify new virulence factors, we have adapted signature-tagged transposon mutagenesis, which has been used essentially in animal models, to an in vitro human macrophage infection model. A library of 1,152 Brucella suis 1330 tagged mini-Tn5 Km2 mutants, in 12 pools, was screened for intracellular survival and multiplication in vitamin D3-differentiated THP1 cells. Eighteen mutants were identified, and their attenuation was confirmed in THP1 macrophages and HeLa cells. For each avirulent mutant, a genomic fragment containing the transposon was cloned. The genomic DNA sequence flanking the transposon allowed us to assign functions to all of the inactivated genes. Transposon integration had occurred in 14 different genes, some of which were known virulence genes involved in intracellular survival or biosynthesis of smooth lipopolysaccharide (the virB operon and manB), thus validating the model. Other genes identified encoded factors involved in the regulation of gene expression and enzymes involved in biosynthetic or metabolic pathways. Possible roles in the virulence of Brucella for the different factors identified are discussed.

* Corresponding author. Mailing address: INSERM U431, Faculté de Médecine, Avenue Kennedy, 30900 Nîmes, France. Phone: (33) 4 66 23 48 99. Fax: (33) 4 66 23 49 28. E-mail: docallaghan{at}zeus.sc.univ-montpl.fr.

Infection and Immunity, March 2000, p. 1297-1303, Vol. 68, No. 3
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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