Abstract
Staphylococcus aureus has an historical relationship with anthropogenic environments, particularly hospitals, where infection characteristics differ from community-acquired disease. This has promoted a designation of strains as healthcare or community associated. Despite this affiliation, genetic approaches have failed to support these groupings. In order to establish the genetic relationship between S. aureus from differing anthropogenic environments, I have analyzed the relatedness between three cohorts of S. aureus: nasal carriage isolates from community participants, infectious isolates from hospitals, and a cohort from an uninvestigated environment, an ambulatory clinic. Multilocus Sequence Typing (MLST) and Staphylococcus aureus protein a (spa) repeat regions were analyzed and the genetic relationships between cohorts at these sites were determined. I found high similarity in recovered sequences within and between all cohorts, with cohorts sharing 100% sequence identity across some samples. Phylogenetic reconstruction of the combined datasets indicate panmixia, with samples of all origins belonging to shared genetic lineages. Additional clustering algorithms supported this pattern. The findings of this study indicate that there is strong genetic similarity between both infectious strains and nasal carriage strains and between isolates from all cohorts. This research has implications for healthcare, as it demonstrates that S. aureus from differing environments are genetically similar (often identical), cautioning against delineating strains into nasal carriage or infectious based on origin. This research also informs the study of S. aureus evolution – strengthening the conclusion that differentiation at stably selected markers in lineages within differing 'healthcare habitats' is insufficient to explain observed phenotypic differences, and alternative explanations must be explored.
Notes
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Graduation Date
2016
Semester
Spring
Advisor
Parkinson, Christopher
Degree
Master of Science (M.S.)
College
College of Sciences
Department
Biology
Degree Program
Biology
Format
application/pdf
Identifier
CFE0006534
URL
http://purl.fcla.edu/fcla/etd/CFE0006534
Language
English
Release Date
11-15-2017
Length of Campus-only Access
1 year
Access Status
Masters Thesis (Open Access)
STARS Citation
Lawrance, Matthew, "Assessment of Staphylococcus aureus Genetics: Clinical versus Community Epidemiology" (2016). Electronic Theses and Dissertations. 5316.
https://stars.library.ucf.edu/etd/5316