The frequency of rDNA variants within individuals provides evidence of population history and gene flow across a grasshopper hybrid zone

Evolution; International Journal of Organic Evolution
Irene KellerRichard A Nichols

Abstract

In the grasshopper Podisma pedestris, units of the ribosomal DNA (rDNA) multigene family are not identical, but comprise multiple genetic variants. We surveyed this variation using a novel pyrosequencing approach. The history of the study populations is well characterized as the pattern of colonization can be inferred from the distribution of two chromosomal races that invaded from different directions after the last glacial maximum and finally met to form a hybrid zone. This knowledge of the populations' ancestry allows us to draw inferences about the rate of change in rDNA composition. The rDNA data have, in turn, been revealing about the populations' ancestry, indicating a previously unsuspected route of postglacial colonization. The two chromosomal races were found to have genetically distinctive rDNA composition, demonstrating the persistence of differences for thousands of generations. It follows that the hybrid zone represents a natural experiment in which repeated crossing and backcrossing between these different rDNA lineages has occurred for over 8000 generations. The association between chromosomal race and rDNA composition has been broken down within the zone. It therefore appears that rDNA variants move freely acro...Continue Reading

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Citations

Sep 22, 2009·Applied and Environmental Microbiology·Justyna WolinskaHenrike Koerner
Oct 23, 2013·PloS One·Holly M BikW Kelley Thomas
May 14, 2011·Molecular Ecology Resources·M R GarvinA J Gharrett
Aug 14, 2013·Molecular Ecology Resources·Sabine Giessler, Justyna Wolinska
Sep 28, 2013·Molecular Phylogenetics and Evolution·Ioana C Chintauan-MarquierLaure Desutter-Grandcolas
May 11, 2011·Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases·Christian RellstabJukka Jokela
Nov 4, 2010·Journal of Evolutionary Biology·J WolinskaS Giessler

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Methods Mentioned

BETA
restriction digest
PCR
genotyping
PCA
PCAs

Software Mentioned

Google Earth
R
R Development Core Team
GenDist

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