y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M E C S ESGMYC EGDC course Gaining expertise in mycobacterial infections Paris, May 27-29, 2013 Emerging Bacterial Pathogens Unit y r a r b i L e r u t c e r Field of science that encompasses L o e h t description, identification, nomenclature n i u l a n and classification O byof organisms D © I M C S E Carl N. Linnaeus Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c (1959): Runyon’s classification e r L o • Photochromogenic slow growers e h t n u i l a • Scotochromogenic slow growers n y O b • Nonchromogenic slow growers D I © M • Rapid growers C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c Phylogenesis e r L o • evolutionary development of h species e t n i u l a Phylogenetic taxonomy n y O b • classification based on characteristics derived from D I © shared descent from common ancestors M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M E C S 0.02 Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E 0.02 Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L Starting with x sequences of yenucleotides r u multiple threes can tbe inferred c e Neighbor-joining r L o • chooses the topology showing the h smallest value of the sum e t nestimateuof correctness of all branches as an i l a n Maximum likelihood y O b • chooses the topology showing the smallest value of the sum D I © of the minimum possible substitutions at all branches as an M estimate of correctness C S Bootstrap E • tests the reliability of a three by resampling and giving the percentage of each branch confirmation Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t . . . genes which are always cexpressed because e r they are necessary for cell function . . . L o e h t • 16S DNA 16S rRNA n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E M. terrae complex Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E SLOW GROWERS Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e M. simiae complex r u t c e r L o e h t n i u l a n O by D © I M C S E RAPID GROWERS Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c • Clear phylogenetic e r separation of slow- L o e h t n and rapid-growers i u l a n • Rapid-growers O by ancestors D © I M • M. terrae complex C intermediate S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L eprotein r • hsp65 65kD heat shock u t • rpoB rRNA polymerase (β subunit) c e r • sodA superoxide dismutase A L o e • dnaK 70kD heatth shock protein n i u l • smpB smallaprotein B n • SsrA O transfer m-RNA y b • tufID elongation factor Tu © • M . . . . C MULTILOCUS PHYLOGENY: the concatenation of S Emultiple sequences substantially increases the reliability of the three Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t • Old definition: group ofc species sharing e r L phenotypic features (difficult to o e h t differentiate) lin au n y O group • New definition: of species closely b D I © related at genotypic and, generally, at M C phenotypic level S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u • M. avium t c • M. intracellulare e r L • M. chimaera o e h • M. colombiense t n i u l • M. arosiense a n • M. vulneris y O b • M. bouchedurhonense D I © • M. marseillense M E C S • M. timonense • M. yongonense • a number of still unclassified mycobacteria Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a • • • • • • • r b i L e r u t c e r L o e h t n i u l a n O by D © I M E C S M. simiae M. florentinum M. genavense M. lentiflavum M. sherrisii M. stomatepiae M. triplex • • • • • • • • • • M. europaeum M. intermedium M. interjectum M. heidelbergense M. kubicae M. montefiorense M. palustre M. parascrofulaceum M. parmense M. saskatchewanense Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a • • • r b i L e r u t c e r L o e h t n i u l a n O by D © I M M. terrae M. nonchromogenicum M. triviale C S • • • • • • • • • M. algericum M. arupense M. engbaekii M. heraklionense M. hiberniae M. kumamotonense M. longobardum M. minnesotense M. senuense E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o • M. fortuitum complex e h t n i u l • M. chelonae-abscessus complex a n y O b • M. smegmatis D © complex I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S KINGDOM TYPE CLASS ORDER FAMILY GENUS SPECIES Bacteria Actinobacteria Actinobacteria Corynebacteriales Mycobacteriaceae Mycobacterium 152 + 9 E Gao and Gupta. Microbiol.Mol.Biol.Rev. 2012 Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S KINGDOM TYPE CLASS ORDER FAMILY GENUS SPECIES Bacteria Actinobacteria Actinobacteria Corynebacteriales Mycobacteriaceae Mycobacterium 152 E Gao and Gupta. Microbiol.Mol.Biol.Rev. 2012 Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S KINGDOM TYPE CLASS ORDER FAMILY GENUS SPECIES Bacteria Actinobacteria Actinobacteria Corynebacteriales Mycobacteriaceae Mycobacterium 152 E Gao and Gupta. Microbiol.Mol.Biol.Rev. 2012 Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E Merhej et al. Biology Direct 2009 Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t When the their relatedness, measured by c e r L DNA-DNA hybridization, is >70% o e h t n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t When the their relatedness, measured by c e r L DNA-DNA hybridization, is >70% o e h t n i • The technique is poorly reproducible u l a n O by D © I M C S E Int.J.Syst.Evol.Microbiol. (2006), 56:2049-54 Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t When the their relatedness, measured by c e r L DNA-DNA hybridization, is >70% o e h t n i • The technique is poorly reproducible u l a n • The large majority of the mycobacterial species have y O b been described without D © investigating DNA-DNA I hybridization M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t When the their relatedness, measured by c e r L DNA-DNA hybridization, is >70% o e h t n i • The technique is poorly reproducible u l a n • The large majority of the mycobacterial species have y O b been described without D © investigating DNA-DNA I hybridization M C • The species of the genus Mycobacterium are more S Eclosely related than those belonging to other genera Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t Great is the expectation forcthe contribution that e r WGS will bring to the definition of the “real” L o e h t phylogeny n u i l a n • by whole genomes comparison y O b • by comparing the gene location within the D I © genomes (gene synteny) M • S.C ... E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M E C S SPECIES ORFs M. smegmatis 6,940 M. rhodesiae 6,340 M. fortuitum 6,300 M. chubuense 6,070 M. vanbaalenii 6,050 M. kansasii 5,960 M. marinum 5,500 M. avium 5,400 M. intracellulare 5,280 M. abscessus 4,990 M. ulcerans 4,310 M. tuberculosis 4,060 M. leprae 2,750 http://www.genomesonline.org Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i SG L G R e r u t c e r L o e h t n i u l a n O by D © I M C S E Emerging Bacterial Pathogens Unit y r a r b i L e r u t c a new species? • Is a single strain enough to describe e r L – at present the answer is referee-dependent o e h – A disappointed proposal ... t n i u l a • Only pathogenic n mycobacteria deserve the sp. nov. y description? O b D I © • Are biochemical features still relevant? M C S E Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit y r a r b i L e r u t c e r L o e h t n i u l a n O by D © I M C S EJune 30-July 3, 2013 - 34 th Congress of European Society of Mycobacteriology www.esmcongress.com Emerging Emerging Bacterial Bacterial Pathogens Pathogens Unit Unit
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