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. 1995 May;69(5):2869–2872. doi: 10.1128/jvi.69.5.2869-2872.1995

Size of genetic bottlenecks leading to virus fitness loss is determined by mean initial population fitness.

I S Novella 1, S F Elena 1, A Moya 1, E Domingo 1, J J Holland 1
PMCID: PMC188983  PMID: 7707510

Abstract

Genetic bottlenecks are important events in the genetic diversification of organisms and colonization of new ecological niches. Repeated bottlenecking of RNA viruses often leads to fitness losses due to the operation of Muller's ratchet. Herein we use vesicular stomatitis virus to determine the transmission population size which leads to fitness decreases of virus populations. Remarkably, the effective size of a genetic bottleneck associated with fitness loss is greater when the fitness of the parental population increases. For example, for starting virus populations with low fitness, population transfers of five-clone-to-five-clone passages resulted in a fitness increase. However, when a parental population with high fitness was transferred, 30-clone-to-30-clone passages were required simply to maintain fitness values.

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Selected References

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