---
_id: '5749'
abstract:
- lang: eng
text: Parasitism creates selection for resistance mechanisms in host populations
and is hypothesized to promote increased host evolvability. However, the influence
of these traits on host evolution when parasites are no longer present is unclear.
We used experimental evolution and whole-genome sequencing of Escherichia coli
to determine the effects of past and present exposure to parasitic viruses (phages)
on the spread of mutator alleles, resistance, and bacterial competitive fitness.
We found that mutator alleles spread rapidly during adaptation to any of four
different phage species, and this pattern was even more pronounced with multiple
phages present simultaneously. However, hypermutability did not detectably accelerate
adaptation in the absence of phages and recovery of fitness costs associated with
resistance. Several lineages evolved phage resistance through elevated mucoidy,
and during subsequent evolution in phage-free conditions they rapidly reverted
to nonmucoid, phage-susceptible phenotypes. Genome sequencing revealed that this
phenotypic reversion was achieved by additional genetic changes rather than by
genotypic reversion of the initial resistance mutations. Insertion sequence (IS)
elements played a key role in both the acquisition of resistance and adaptation
in the absence of parasites; unlike single nucleotide polymorphisms, IS insertions
were not more frequent in mutator lineages. Our results provide a genetic explanation
for rapid reversion of mucoidy, a phenotype observed in other bacterial species
including human pathogens. Moreover, this demonstrates that the types of genetic
change underlying adaptation to fitness costs, and consequently the impact of
evolvability mechanisms such as increased point-mutation rates, depend critically
on the mechanism of resistance.
acknowledgement: The authors thank three anonymous reviewers and the editor for helpful
comments on the manuscript, as well as Dominique Schneider for feedback on an earlier
draft, Jenna Gallie for lytic λ and Julien Capelle for T5 and T6. This work was
supported by the Swiss National Science Foundation (PZ00P3_148255 to A.H.) and an
EU Marie Curie PEOPLE Postdoctoral Fellowship for Career Development (FP7-PEOPLE-2012-IEF-331824
to S.W.).
article_processing_charge: No
author:
- first_name: Sébastien
full_name: Wielgoss, Sébastien
last_name: Wielgoss
- first_name: Tobias
full_name: Bergmiller, Tobias
id: 2C471CFA-F248-11E8-B48F-1D18A9856A87
last_name: Bergmiller
orcid: 0000-0001-5396-4346
- first_name: Anna M.
full_name: Bischofberger, Anna M.
last_name: Bischofberger
- first_name: Alex R.
full_name: Hall, Alex R.
last_name: Hall
citation:
ama: Wielgoss S, Bergmiller T, Bischofberger AM, Hall AR. Adaptation to parasites
and costs of parasite resistance in mutator and nonmutator bacteria. Molecular
Biology and Evolution. 2016;33(3):770-782. doi:10.1093/molbev/msv270
apa: Wielgoss, S., Bergmiller, T., Bischofberger, A. M., & Hall, A. R. (2016).
Adaptation to parasites and costs of parasite resistance in mutator and nonmutator
bacteria. Molecular Biology and Evolution. Oxford University Press. https://doi.org/10.1093/molbev/msv270
chicago: Wielgoss, Sébastien, Tobias Bergmiller, Anna M. Bischofberger, and Alex
R. Hall. “Adaptation to Parasites and Costs of Parasite Resistance in Mutator
and Nonmutator Bacteria.” Molecular Biology and Evolution. Oxford University
Press, 2016. https://doi.org/10.1093/molbev/msv270.
ieee: S. Wielgoss, T. Bergmiller, A. M. Bischofberger, and A. R. Hall, “Adaptation
to parasites and costs of parasite resistance in mutator and nonmutator bacteria,”
Molecular Biology and Evolution, vol. 33, no. 3. Oxford University Press,
pp. 770–782, 2016.
ista: Wielgoss S, Bergmiller T, Bischofberger AM, Hall AR. 2016. Adaptation to parasites
and costs of parasite resistance in mutator and nonmutator bacteria. Molecular
Biology and Evolution. 33(3), 770–782.
mla: Wielgoss, Sébastien, et al. “Adaptation to Parasites and Costs of Parasite
Resistance in Mutator and Nonmutator Bacteria.” Molecular Biology and Evolution,
vol. 33, no. 3, Oxford University Press, 2016, pp. 770–82, doi:10.1093/molbev/msv270.
short: S. Wielgoss, T. Bergmiller, A.M. Bischofberger, A.R. Hall, Molecular Biology
and Evolution 33 (2016) 770–782.
date_created: 2018-12-18T13:18:10Z
date_published: 2016-03-01T00:00:00Z
date_updated: 2023-09-05T13:46:05Z
day: '01'
ddc:
- '576'
department:
- _id: CaGu
doi: 10.1093/molbev/msv270
external_id:
pmid:
- '26609077'
file:
- access_level: open_access
checksum: 47d9010690b6c5c17f2ac830cc63ac5c
content_type: application/pdf
creator: dernst
date_created: 2018-12-18T13:21:45Z
date_updated: 2020-07-14T12:47:10Z
file_id: '5750'
file_name: 2016_MolBiolEvol_Wielgoss.pdf
file_size: 634037
relation: main_file
file_date_updated: 2020-07-14T12:47:10Z
has_accepted_license: '1'
intvolume: ' 33'
issue: '3'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc/4.0/
month: '03'
oa: 1
oa_version: Published Version
page: 770-782
pmid: 1
publication: Molecular Biology and Evolution
publication_identifier:
eissn:
- 1537-1719
issn:
- 0737-4038
publication_status: published
publisher: Oxford University Press
pubrep_id: '587'
quality_controlled: '1'
related_material:
record:
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relation: research_data
status: public
scopus_import: '1'
status: public
title: Adaptation to parasites and costs of parasite resistance in mutator and nonmutator
bacteria
tmp:
image: /images/cc_by_nc.png
legal_code_url: https://creativecommons.org/licenses/by-nc/4.0/legalcode
name: Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
short: CC BY-NC (4.0)
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 33
year: '2016'
...