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Linking influenza virus evolution within and between human hosts

View ORCID ProfileKatherine S. Xue, View ORCID ProfileJesse D. Bloom
doi: https://doi.org/10.1101/812016
Katherine S. Xue
Department of Genome Sciences, University of Washington, Seattle, WABasic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA
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Jesse D. Bloom
Department of Genome Sciences, University of Washington, Seattle, WABasic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WAHoward Hughes Medical Institute, Seattle, WA
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  • For correspondence: jbloom@fredhutch.org
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Abstract

Influenza viruses rapidly diversify within individual human infections. Several recent studies have deep-sequenced clinical influenza infections to identify viral variation within hosts, but it remains unclear how within-host mutations fare in the global viral population. Here, we compare viral variation within and between hosts to link influenza’s evolutionary dynamics across scales. Synonymous sites evolve at similar rates at both scales, indicating that global evolution at these putatively neutral sites results from the accumulation of within-host variation. However, nonsynonymous mutations are depleted in global viral populations compared to within hosts, suggesting that selection purges many of the protein-altering changes that arise within hosts. The exception is at antigenic sites, where selection detectably favors nonsynonymous mutations at the global scale, but not within hosts. These results suggest that selection against deleterious mutations and selection for antigenic change are the main forces that transform influenza’s within-host genetic variation into global evolution.

Footnotes

  • ↵† Department of Biology, Stanford University, Stanford, CA

  • https://github.com/ksxue/within-vs-between-hosts-influenza

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted October 21, 2019.
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Linking influenza virus evolution within and between human hosts
Katherine S. Xue, Jesse D. Bloom
bioRxiv 812016; doi: https://doi.org/10.1101/812016
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Linking influenza virus evolution within and between human hosts
Katherine S. Xue, Jesse D. Bloom
bioRxiv 812016; doi: https://doi.org/10.1101/812016

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