ArticleMobile DNA2014
Impact of ploidy level on the distribution of Pokey element insertions in the Daphnia pulex complex.
Article in Mobile DNA, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundTransposable elements (TEs) play a major role in genome evolution. Their capacity to move and/or multiply in the genome of their host may have profound impacts on phenotypes and dramatic consequences on genome structure. The population dynamics and distribution of TEs are influenced by their mode of transposition, the availability of niches in host genomes, and host population dynamics. Theories predict an increase in the number of TE insertions following hybridization or polyploidization. Evolution of TEs in hybrids and polyploids has mostly been studied in plants; few studies have examined the impacts of hybridization and/or polyploidization on TEs in animals. Hybrids and polyploids have arisen multiple times in the Daphnia pulex complex and are thought to reproduce by obligate parthenogenesis. Our study examines the effects of ploidy level on polymorphism and number of Pokey element insertions in diploid and polyploid hybrid isolates from the Daphnia pulex complex.
resultsThe polymorphism of Pokey insertion sites did not depend solely on either the ploidy level or the genetic background of their host; therefore, it may be the result of interactions between these parameters and other parameters such as Pokey activity, selection and/or drift. No significant effect of ploidy level was found on the number of Pokey insertions using TE display and qPCR. However, the load of Pokey insertion sites and the number of unique insertion sites were slightly (but not significantly) higher in polyploids than in diploids.
conclusionsThese results suggest a lack of increase in the number of Pokey insertions following polyploidization but higher availability of Pokey insertion sites in polyploids than in diploids. Compared to previous TE display and qPCR results, the load of Pokey insertions in hybrid diploids was higher than in non-hybrid sexual and asexual diploids, which suggests an increase in the density of Pokey insertions following hybridization.
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