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Low genetic variation is associated with low mutation rate in the giant duckweed

MPG-Autoren
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Gablenz,  Saskia
Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society;

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Boyer,  Justin
Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society;

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Gershenzon,  Jonathan
Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society;

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Huber,  Meret
Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society;

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Zitation

Xu, S., Stapley, J., Gablenz, S., Boyer, J., Appenroth, K. J., Sree, S. K., et al. (in press). Low genetic variation is associated with low mutation rate in the giant duckweed. bioRxiv. doi:10.1101/381574.


Zitierlink: http://hdl.handle.net/21.11116/0000-0001-DE46-7
Zusammenfassung
Mutation rate and effective population size (Ne) jointly determine intraspecific genetic diversity, but the role of mutation rate is often ignored. We investigate genetic diversity, spontaneous mutation rate and Ne in the giant duckweed (Spirodela polyrhiza). Despite its large census population size, whole-genome sequencing of 68 globally sampled individuals revealed extremely low within-species genetic diversity. Assessed under natural conditions, the genome-wide spontaneous mutation rate is at least seven times lower than estimates made for other multicellular eukaryotes, whereas Ne is large. These results demonstrate that low genetic diversity can be associated with large-Ne species, where selection can reduce mutation rates to very low levels, and accurate estimates of mutation rate can help to explain seemingly counter-intuitive patterns of genome-wide variation.