Journal
PLOS GENETICS
Volume 7, Issue 8, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pgen.1002188
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Funding
- MEXT [21770255, 23570268]
- Inamori Foundation
- Kato Memorial Bioscience Foundation
- Hirosaki University
- Hirosaki University Institutional Research
- Office for Promotion of Gender Equality Hirosaki University
- ERATO
- Kaneko Complex Systems Biology Project
- JST
- Grants-in-Aid for Scientific Research [23570277, 21770255, 23570268] Funding Source: KAKEN
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According to the Red Queen hypothesis or arms race dynamics, coevolution drives continuous adaptation and counter-adaptation. Experimental models under simplified environments consisting of bacteria and bacteriophages have been used to analyze the ongoing process of coevolution, but the analysis of both parasites and their hosts in ongoing adaptation and counter-adaptation remained to be performed at the levels of population dynamics and molecular evolution to understand how the phenotypes and genotypes of coevolving parasite-host pairs change through the arms race. Copropagation experiments with Escherichia coli and the lytic RNA bacteriophage Q beta in a spatially unstructured environment revealed coexistence for 54 days (equivalent to 163-165 replication generations of Q beta) and fitness analysis indicated that they were in an arms race. E. coli first adapted by developing partial resistance to infection and later increasing specific growth rate. The phage counter-adapted by improving release efficiency with a change in host specificity and decrease in virulence. Whole-genome analysis indicated that the phage accumulated 7.5 mutations, mainly in the A2 gene, 3.4-fold faster than in Q beta propagated alone. E. coli showed fixation of two mutations (in traQ and csdA) faster than in sole E. coli experimental evolution. These observations suggest that the virus and its host can coexist in an evolutionary arms race, despite a difference in genome mutability (i.e., mutations per genome per replication) of approximately one to three orders of magnitude.
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