Affiliation:
1. Department of Genome Sciences, University of Washington, Seattle, Washington, USA
2. Department of Microbiology, University of Washington, Seattle, Washington, USA
Abstract
ABSTRACT
Klebsiella pneumoniae
and other carbapenem-resistant members of the family
Enterobacteriaceae
are a major cause of hospital-acquired infections, yet the basis of their success as nosocomial pathogens is poorly understood. To help provide a foundation for genetic analysis of
K. pneumoniae
, we created an arrayed, sequence-defined transposon mutant library of an isolate from the 2011 outbreak of infections at the U.S. National Institutes of Health Clinical Center. The library is made up of 12,000 individually arrayed mutants of a carbapenemase deletion parent strain and provides coverage of 85% of the predicted genes. The library includes an average of 2.5 mutants per gene, with most insertion locations identified and confirmed in two independent rounds of Sanger sequencing. On the basis of an independent transposon sequencing assay, about half of the genes lacking representatives in this “two-allele” library are essential for growth on nutrient agar. To validate the use of the library for phenotyping, we screened candidate mutants for increased antibiotic sensitivity by using custom phenotypic microarray plates. This screening identified several mutations increasing sensitivity to β-lactams (in
acrB1
,
mcrB
,
ompR
,
phoP1
, and
slt1
) and found that two-component regulator
cpxAR
mutations increased multiple sensitivities (to an aminoglycoside, a fluoroquinolone, and several β-lactams). Strains making up the two-allele mutant library are available through a web-based request mechanism.
IMPORTANCE
K. pneumoniae
and other carbapenem-resistant members of the family
Enterobacteriaceae
are recognized as a top public health threat by the Centers for Disease Control and Prevention. The analysis of these major nosocomial pathogens has been limited by the experimental resources available for studying them. The work presented here describes a sequence-defined mutant library of a
K. pneumoniae
strain (KPNIH1) that represents an attractive model for studies of this pathogen because it is a recent isolate of the major sequence type that causes infection, the epidemiology of the outbreak it caused is well characterized, and an annotated genome sequence is available. The ready availability of defined mutants deficient in nearly all of the nonessential genes of the model strain should facilitate the genetic dissection of complex traits like pathogenesis and antibiotic resistance.
Funder
HHS | National Institutes of Health
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
63 articles.
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