Impact of polymorphic transposable elements on linkage disequilibrium along chromosomes

摘要: Abstract Recombination and selection drive the extent of linkage disequilibrium (LD) among loci therefore affect reshuffling adaptive genetic variation. However, it is poorly known to what enrichment transposable elements (TEs) in recombinationally-inert regions reflects their inefficient removal by purifying whether presence polymorphic TEs can modify local recombination rate. In this study, we investigate how interact at fine scale along chromosomes possibly support linked natural populations. Whole-genome sequencing data 304 individuals from nearby alpine populations Arabis alpina were used show that density specifically correlated with LD chromosomes. Consistent modifying recombination, characterization 28 such blocks up 5.5Mb length revealed strong evidence selective sweeps a few through either site frequency spectrum or haplotype structure. A majority these enriched genes related ecologically relevant functions as responses cold, salt stress photoperiodism. particular, S-locus (i.e. supergene responsible for strict outcrossing) was identified block high levels selection. Another cold-responding presented photoperiodism flowering being increasingly TEs. These results are consistent hypothesis landscapes thus driving This article protected copyright. All rights reserved.