Mar 3, 2016

Transposable Element Evolution in the Allotetraploid Capsella bursa-pastoris

BioRxiv : the Preprint Server for Biology
J Arvid AgrenStephen I Wright


Premise of the study Shifts in ploidy affect the evolutionary dynamics of genomes in a myriad of ways. Population genetic theory predicts that transposable element (TE) proliferation may follow because the genome wide efficacy of selection should be reduced and the increase in gene copies may mask the deleterious effects of TE insertions. Moreover, in allopolyploids TEs may further accumulate because of hybrid breakdown of TE silencing. However, to date the evidence of TE proliferation following an increase in ploidy is mixed, and the relative importance of relaxed selection vs. silencing breakdown remains unclear. Methods We used high-coverage whole genome sequence data to evaluate the abundance, genomic distribution, and population frequencies of TEs in the self-fertilizing recent allotetraploid Capsella bursa-pastoris (Brassicaceae). We then compared the C. bursa-pastoris TE profile with that of its two parental diploid species, outcrossing C. grandiflora and self-fertilizing C. orientalis. Key results We found no evidence that C. bursa-pastoris has experienced a large genome wide proliferation of TEs relative to its parental species. However, when centromeric regions are excluded, we find evidence of significantly higher ab...Continue Reading

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Mentioned in this Paper

Conringia orientalis
Pachyneurum grandiflorum
Genome-Wide Association Study
Crataegus orientalis
Chrysopogon orientalis
Cytisus orientalis
Gracilaria bursa-pastoris

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