Variability of Rates of Mutation and Fitness Decline During Mutation Accumulation in Escherichia coli Isolates
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During infectious disease outbreak investigations, mutation rates amongst lineages of clinical bacterial pathogens can be highly variable; what is classified as multiple outbreaks could indicate high genetic variation amongst descendants of a single outbreak event. Consequently, the best way to define the genetic boundaries of an outbreak cluster is currently unclear. Over 2720 generations of mutation accumulation on average, I explored mutation rate and fitness decline variation in nine clinical isolates of Escherichia coli and I found that there was high variation between, but less commonly within, genotypes. Genotypes could be generally be categorised by mutation rate and fitness decline variation between replicates as either: (1) non-mutator genotypes with low variation, non-mutator genotypes with high variation because of (2) (an) infrequent mutator replicate(s), or (3) mutator genotypes with high or low variation. My findings have important implications both for molecular epidemiology of bacterial pathogens and predicting evolution in pathogen pathways.
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Copyright © 2021 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2021
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mattrasingh-williams-variabilityofratesofmutationandfitnessdecline.pdf | 2023-05-05 | Public | Download | |
mattrasingh-williams-variabilityofratesofmutationandfitnessdecline-supplemental.zip | 2023-05-05 | Public | Download |