Transposable elements employ distinct integration strategies with respect to transcriptional landscapes in eukaryotic genomes

Xinyan Zhang, Meixia Zhao, Donald R McCarty, Damon Lisch
2020 Nucleic Acids Research  
Transposable elements (TEs) are ubiquitous DNA segments capable of moving from one site to another within host genomes. The extant distributions of TEs in eukaryotic genomes have been shaped by both bona fide TE integration preferences in eukaryotic genomes and by selection following integration. Here, we compare TE target site distribution in host genomes using multiple de novo transposon insertion datasets in both plants and animals and compare them in the context of genome-wide
more » ... l landscapes. We showcase two distinct types of transcription-associated TE targeting strategies that suggest a process of convergent evolution among eukaryotic TE families. The integration of two precision-targeting elements are specifically associated with initiation of RNA Polymerase II transcription of highly expressed genes, suggesting the existence of novel mechanisms of precision TE targeting in addition to passive targeting of open chromatin. We also highlight two features that can facilitate TE survival and rapid proliferation: tissue-specific transposition and minimization of negative impacts on nearby gene function due to precision targeting.
doi:10.1093/nar/gkaa370 pmid:32442316 fatcat:pujg4vu7b5dyhnxdooix5o24vm