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2015 ; 83
(10
): 4165-73
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gab.com Text
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Comparative Genomic Analysis of Meningitis- and Bacteremia-Causing Pneumococci
Identifies a Common Core Genome
#MMPMID26259813
Kulohoma BW
; Cornick JE
; Chaguza C
; Yalcin F
; Harris SR
; Gray KJ
; Kiran AM
; Molyneux E
; French N
; Parkhill J
; Faragher BE
; Everett DB
; Bentley SD
; Heyderman RS
Infect Immun
2015[Oct]; 83
(10
): 4165-73
PMID26259813
show ga
Streptococcus pneumoniae is a nasopharyngeal commensal that occasionally invades
normally sterile sites to cause bloodstream infection and meningitis. Although
the pneumococcal population structure and evolutionary genetics are well defined,
it is not clear whether pneumococci that cause meningitis are genetically
distinct from those that do not. Here, we used whole-genome sequencing of 140
isolates of S. pneumoniae recovered from bloodstream infection (n = 70) and
meningitis (n = 70) to compare their genetic contents. By fitting a
double-exponential decaying-function model, we show that these isolates share a
core of 1,427 genes (95% confidence interval [CI], 1,425 to 1,435 genes) and that
there is no difference in the core genome or accessory gene content from these
disease manifestations. Gene presence/absence alone therefore does not explain
the virulence behavior of pneumococci that reach the meninges. Our analysis,
however, supports the requirement of a range of previously described virulence
factors and vaccine candidates for both meningitis- and bacteremia-causing
pneumococci. This high-resolution view suggests that, despite considerable
competency for genetic exchange, all pneumococci are under considerable pressure
to retain key components advantageous for colonization and transmission and that
these components are essential for access to and survival in sterile sites.