Genome-wide analysis of Brucella melitensis growth in spleen of infected mice allows rational selection of new vaccine candidates.

Publisher: Public Library of Science Country of Publication: United States NLM ID: 101238921 Publication Model: eCollection Cited Medium: Internet ISSN: 1553-7374 (Electronic) Linking ISSN: 15537366 NLM ISO Abbreviation: PLoS Pathog Subsets: MEDLINE

Original Publication: San Francisco, CA : Public Library of Science, c2005-

Brucella melitensis*/immunology ; Brucella melitensis*/genetics ; Brucella melitensis*/pathogenicity ; Brucellosis*/prevention & control ; Brucellosis*/immunology ; Brucellosis*/microbiology ; Spleen*/microbiology ; Spleen*/immunology ; Brucella Vaccine*/immunology ; Brucella Vaccine*/genetics ; Mice, Inbred C57BL*; Animals ; Mice ; Vaccines, Attenuated/immunology ; Virulence ; Female ; Genome, Bacterial ; Lung/microbiology ; Lung/immunology

Live attenuated vaccines (LAVs) whose virulence would be controlled at the tissue level could be a crucial tool to effectively fight intracellular bacterial pathogens, because they would optimize the induction of protective immune memory while avoiding the long-term persistence of vaccine strains in the host. Rational development of these new LAVs implies developing an exhaustive map of the bacterial virulence genes according to the host organs implicated. We report here the use of transposon sequencing to compare the bacterial genes involved in the multiplication of Brucella melitensis, a major causative agent of brucellosis, in the lungs and spleens of C57BL/6 infected mice. We found 257 and 135 genes predicted to be essential for B. melitensis multiplication in the spleen and lung, respectively, with 87 genes common to both organs. We selected genes whose deletion is predicted to produce moderate or severe attenuation in the spleen, the main known reservoir of Brucella, and compared deletion mutants for these genes for their ability to protect mice against challenge with a virulent strain of B. melitensis. The protective efficacy of a deletion mutant for the plsC gene, implicated in phospholipid biosynthesis, is similar to that of the reference Rev.1 vaccine but with a shorter persistence in the spleen. Our results demonstrate that B. melitensis faces different selective pressures depending on the organ and underscore the effectiveness of functional genome mapping for the design of new safer LAV candidates.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2024 Barbieux et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)

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0 (Brucella Vaccine)
0 (Vaccines, Attenuated)

Date Created: 20240826 Date Completed: 20240826 Latest Revision: 20240828

20240828

PMC11346958

10.1371/journal.ppat.1012459

39186777