RT Journal Article
SR Electronic
T1 Soft selective sweeps in evolutionary rescue
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 052993
DO 10.1101/052993
A1 Benjamin A. Wilson
A1 Pleuni S. Pennings
A1 Dmitri A. Petrov
YR 2016
UL http://biorxiv.org/content/early/2016/05/12/052993.abstract
AB Evolutionary rescue occurs when a population that is declining in size because of an environmental change is rescued by genetic adaptation. Evolutionary rescue is an important phenomenon at the intersection of ecology and population genetics. While most population genetic models of evolutionary rescue focus on estimating the probability of rescue, we focus on whether one or more adaptive lineages contribute to evolutionary rescue. We find that when evolutionary rescue is likely, it is often driven by soft selective sweeps where multiple adaptive mutations spread through the population simultaneously. We give full analytic results for the probability of evolutionary rescue and the probability that evolutionary rescue occurs via soft selective sweeps in our model. We expect that these results will find utility in understanding the genetic signatures associated with various evolutionary rescue scenarios in large populations, such as the evolution of drug resistance in viral, bacterial, or eukaryotic pathogens.