Whole genome sequencing to investigate the emergence of clonal complex 23 Neisseria meningitidis serogroup Y disease in the United States.

PloS One
Mary G KraulandLee H Harrison

Abstract

In the United States, serogroup Y, ST-23 clonal complex Neisseria meningitidis was responsible for an increase in meningococcal disease incidence during the 1990s. This increase was accompanied by antigenic shift of three outer membrane proteins, with a decrease in the population that predominated in the early 1990s as a different population emerged later in that decade. To understand factors that may have been responsible for the emergence of serogroup Y disease, we used whole genome pyrosequencing to investigate genetic differences between isolates from early and late N. meningitidis populations, obtained from meningococcal disease cases in Maryland in the 1990s. The genomes of isolates from the early and late populations were highly similar, with 1231 of 1776 shared genes exhibiting 100% amino acid identity and an average π(N)  =  0.0033 and average π(S)  =  0.0216. However, differences were found in predicted proteins that affect pilin structure and antigen profile and in predicted proteins involved in iron acquisition and uptake. The observed changes are consistent with acquisition of new alleles through horizontal gene transfer. Changes in antigen profile due to the genetic differences found in this study likely allowed t...Continue Reading

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Datasets Mentioned

BETA
AGRR00000000
JN681264

Methods Mentioned

BETA
electrophoresis
genotyping
454 sequencing
restriction modification
glycosylation
PCR

Software Mentioned

IDEA
Manatee
RNAmmer
ClustalW2
SE
SignalP
GMAJ
BLAST
Roche
EMBOSS tranalign

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