ESCMID Online Lecture Library © by author

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ESGMYC EGDC course
Gaining expertise in mycobacterial infections
Paris, May 27-29, 2013
Emerging Bacterial Pathogens Unit
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Field of science that
encompasses
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description, identification,
nomenclature
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and classification
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Carl N. Linnaeus Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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c (1959):
Runyon’s classification
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•  Photochromogenic
slow
growers
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•  Scotochromogenic
slow growers
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•  Nonchromogenic
slow growers
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•  Rapid growers
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Phylogenesis
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•  evolutionary development
of h
species
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Phylogenetic taxonomy
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•  classification
based
on characteristics derived from
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shared
descent
from common ancestors
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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0.02
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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0.02
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Starting with x sequences of yenucleotides
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multiple threes can tbe
inferred
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Neighbor-joining
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smallest
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nestimateuof correctness
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Maximum likelihood
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•  chooses the
topology
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of the minimum
possible
substitutions at all branches as an
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estimate
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C
S
Bootstrap
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•  tests the reliability of a three by resampling and giving the
percentage of each branch confirmation
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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. . . genes which are always cexpressed because
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they are necessary for cell
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16S
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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M. terrae complex
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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SLOW GROWERS
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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M. simiae complex
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RAPID GROWERS
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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•  Clear phylogenetic
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separation of slow- L
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•  Rapid-growers
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•  M. terrae
complex
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intermediate
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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eprotein
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•  hsp65
65kD heat shock
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•  rpoB
rRNA polymerase
(β subunit)
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•  sodA
superoxide
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•  dnaK
70kD heatth
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•  smpB
smallaprotein
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•  SsrA O
transfer
m-RNA
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elongation factor Tu
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MULTILOCUS
PHYLOGENY: the concatenation of
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Emultiple sequences substantially increases the
reliability of the three
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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•  Old definition: group ofc species sharing
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phenotypic features
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•  New definition:
of species closely
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related
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phenotypic
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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•  M. avium
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•  M. intracellulare
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•  M. chimaera
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•  M. colombiense
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•  M. arosiense
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•  M. bouchedurhonense
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•  M. marseillense
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•  M. timonense
•  M. yongonense
•  a number of still unclassified mycobacteria
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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• 
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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
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M. terrae
M. nonchromogenicum
M. triviale
C
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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
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•  M. fortuitum complex
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•  M. chelonae-abscessus
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•  M. smegmatis
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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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
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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
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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
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Merhej et al. Biology Direct 2009
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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When the their relatedness,
measured by
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DNA-DNA hybridization,
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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When the their relatedness,
measured by
c
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DNA-DNA hybridization,
is
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•  The technique is poorly
reproducible
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Int.J.Syst.Evol.Microbiol. (2006), 56:2049-54
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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When the their relatedness,
measured by
c
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r
L
DNA-DNA hybridization,
is
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reproducible
u
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a
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•  The large majority
of the
mycobacterial species have
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been described
without
D © investigating DNA-DNA
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hybridization
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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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
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been described
without
D © investigating DNA-DNA
I
hybridization
M
C
•  The
species of the genus Mycobacterium are more
S
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Great is the expectation forcthe contribution that
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WGS will bring to the definition
of
the “real”
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phylogeny
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•  by whole genomes
comparison
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D
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genomes
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synteny)
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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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
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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Emerging Bacterial Pathogens Unit
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•  Is a single strain enough to describe
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D
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•  Are biochemical features
still relevant?
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Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit
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I
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EJune 30-July 3, 2013 - 34
th
Congress of European Society of
Mycobacteriology
www.esmcongress.com
Emerging
Emerging
Bacterial
Bacterial
Pathogens
Pathogens
Unit Unit