Marine sponge microbe provides insights into evolution and virulence of the tubercle bacillus

被引:0
|
作者
Pidot, Sacha J. [1 ]
Klatt, Stephan [2 ,8 ]
Ates, Louis S. [3 ]
Frigui, Wafa [3 ]
Sayes, Fadel [3 ]
Majlessi, Laleh [3 ]
Izumi, Hiroshi [4 ]
Monk, Ian R. [1 ]
Porter, Jessica L. [1 ]
Bennett-Wood, Vicki [1 ]
Seemann, Torsten [1 ]
Otter, Ashley [5 ]
Taiaroa, George [6 ]
Cook, Gregory M. [6 ]
West, Nicholas [4 ]
Tobias, Nicholas J. [1 ]
Fuerst, John A. [4 ]
Stutz, Michael D. [7 ]
Pellegrini, Marc [7 ]
McConville, Malcolm [2 ]
Brosch, Roland [3 ]
Stinear, Timothy P. [1 ]
机构
[1] Univ Melbourne, Peter Doherty Inst Infect & Immun, Dept Microbiol & Immunol, Melbourne, Australia
[2] Univ Melbourne, Bio21 Inst, Dept Biochem & Mol Biol, Parkville, Vic, Australia
[3] Univ Paris Cite, Inst Pasteur, Unit Integrated Mycobacterial Pathogen, Paris, France
[4] Univ Queensland, Sch Chem & Mol Biosci, Brisbane, Australia
[5] UK Hlth Secur Agcy, Salisbury, England
[6] Univ Otago, Dept Microbiol & Immunol, Dunedin, New Zealand
[7] Walter & Eliza Hall Inst Med Res, Parkville, Australia
[8] Goethe Univ Frankfurt, Inst Vasc Signalling, Centreof Mol Med, Frankfurt, Germany
基金
英国医学研究理事会; 澳大利亚研究理事会; 澳大利亚国家健康与医学研究理事会;
关键词
MYCOBACTERIUM-TUBERCULOSIS; SP NOV; SECRETION SYSTEM; GENOME SEQUENCE; BIOSYNTHESIS; PROTEIN; IDENTIFICATION; LIPOOLIGOSACCHARIDES; COMPLEX; GENE;
D O I
10.1371/journal.ppat.1012440
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Reconstructing the evolutionary origins of Mycobacterium tuberculosis, the causative agent of human tuberculosis, has helped identify bacterial factors that have led to the tubercle bacillus becoming such a formidable human pathogen. Here we report the discovery and detailed characterization of an exceedingly slow growing mycobacterium that is closely related to M. tuberculosis for which we have proposed the species name Mycobacterium spongiae sp. nov., (strain ID: FSD4b-SM). The bacterium was isolated from a marine sponge, taken from the waters of the Great Barrier Reef in Queensland, Australia. Comparative genomics revealed that, after the opportunistic human pathogen Mycobacterium decipiens, M. spongiae is the most closely related species to the M. tuberculosis complex reported to date, with 80% shared average nucleotide identity and extensive conservation of key M. tuberculosis virulence factors, including intact ESX secretion systems and associated effectors. Proteomic and lipidomic analyses showed that these conserved systems are functional in FSD4b-SM, but that it also produces cell wall lipids not previously reported in mycobacteria. We investigated the virulence potential of FSD4b-SM in mice and found that, while the bacteria persist in lungs for 56 days after intranasal infection, no overt pathology was detected. The similarities with M. tuberculosis, together with its lack of virulence, motivated us to investigate the potential of FSD4b-SM as a vaccine strain and as a genetic donor of the ESX-1 genetic locus to improve BCG immunogenicity. However, neither of these approaches resulted in superior protection against M. tuberculosis challenge compared to BCG vaccination alone. The discovery of M. spongiae adds to our understanding of the emergence of the M. tuberculosis complex and it will be another useful resource to refine our understanding of the factors that shaped the evolution and pathogenesis of M. tuberculosis. Tuberculosis, caused by Mycobacterium tuberculosis, is still one of the world's deadliest infectious diseases. However, the origins and rise of M. tuberculosis as a successful pathogen are not well understood. Here, we report the isolation and characterisation of a marine sponge-derived mycobacterium (M. spongiae) from the Great Barrier Reef that has striking genotypic similarity to M. tuberculosis, with 80% average nucleotide identity. We further show by proteomic and lipidomic analyses that M. spongiae shares virulence factors and unique cell wall lipids with the tubercle bacillus. In spite of these conserved genotypic and phenotypic features, M. spongiae was not virulent in a mouse model of infection, leading us to investigate its potential as a vaccine strain or genetic donor for enhancing the current BCG vaccine for tuberculosis. Our findings contribute to understanding the evolutionary origins of M. tuberculosis and provide further insights into its pathogenesis.
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页数:27
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