Our long-term goal is to advance the understanding, at the molecular level, of the pathogenicity and epidemiology of uropathogenic Escherichia coli (UPEC) strains to better target treatment and prophylaxis of urinary tract infections, reduce resistance, and provide information on possible targets for vaccines and antibiotics. The proposed studies are focused on understanding the basis of urovirulence of E. coli by the comparative genome-wide analysis of strains that will be isolated from a large number of patients with first-time and recurrent cystitis and healthy women. The central hypothesis is that the relatively few clonal groups involved in UPEC human pathogenesis can be defined and characterized as to their key genetic loci and the impact of genetic variations on UPEC virulence. Our preliminary data support that we can investigate sizeable samples of fresh isolates, establish strong clonal associations with recurrent cystitis and determine genome- wide the pathogenicity-adaptive genetic changes. We will determine how mutational changes (single nucleotide polymorphisms, small insertions/deletions, etc) and horizontal gene transfer contribute to the emergence of UPEC.
Our aim i s to potentially examine every gene shared by at least a portion of UPEC strains for being under positive selection for pathogenicity-adaptive mutations or horizontal transfer. For this, we will employ a population genomics-based analysis to trace the mutations and gene transfer, followed by assessment of the functional significance of the representative positively selected loci in UPEC.

Public Health Relevance

In practical terms, accomplishment of the proposed studies will advance at the molecular level our understanding of the pathogenicity and epidemiology of UPEC strains and will provide information on possible targets for vaccines, antibiotics, or other therapeutics.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
1R01AI106007-01A1
Application #
8639068
Study Section
Special Emphasis Panel (UGPP)
Program Officer
Korpela, Jukka K
Project Start
2013-11-19
Project End
2018-10-31
Budget Start
2013-11-19
Budget End
2014-10-31
Support Year
1
Fiscal Year
2014
Total Cost
$707,270
Indirect Cost
$207,543
Name
University of Washington
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
605799469
City
Seattle
State
WA
Country
United States
Zip Code
98195