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Infection and Immunity, July 2000, p. 4102-4107, Vol. 68, No. 7
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Identification of Genes Required for Chronic Persistence of Brucella abortus in Mice

Priscilla C. Hong, Renée M. Tsolis,* and Thomas A. Ficht

Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843-4467

Received 8 December 1999/Returned for modification 1 February 2000/Accepted 19 April 2000

The genetic basis for chronic persistence of Brucella abortus in lymphoid organs of mice, cows, and humans is currently unknown. We identified B. abortus genes involved in chronic infection, by assessing the ability of 178 signature-tagged mutants to establish and maintain persistent infection in mice. Each mutant was screened for its ability to colonize the spleens of mice at 2 and 8 weeks after inoculation. Comparison of the results from both time points identified two groups of mutants attenuated for chronic infection in mice. The first group was not recovered at either 2 or 8 weeks postinfection and was therefore defective in establishing infection. Mutants in this group carried transposon insertions in genes involved in lipopolysaccharide biosynthesis (wbkA), in aromatic amino acid biosynthesis, and in type IV secretion (virB1 and virB10). The second group, which was recovered at wild-type levels 2 weeks postinfection but not 8 weeks postinfection was able to establish infection but was unable to maintain chronic infection. One mutant in this group carried a transposon insertion in a gene with homology to gcvB of Mycobacterium tuberculosis, encoding glycine dehydrogenase, an enzyme whose activity is increased during the state of nonreplicating persistence. These results suggest that some mechanisms for long-term persistence may be shared among chronic intracellular pathogens. Furthermore, identification of two groups of genes, those required for initiating infection and those required only for long-term persistence, suggests that B. abortus uses distinct sets of virulence determinants to establish and maintain chronic infection in mice.

* Corresponding author. Mailing address: Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843-4467. Phone: (979) 862-4779. Fax: (979) 862-1088. E-mail: rtsolis{at}cvm.tamu.edu.

Infection and Immunity, July 2000, p. 4102-4107, Vol. 68, No. 7
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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