8/30/2023 0 Comments Knut nystedt o crux pdfUnlike previous work in angiosperms, we found no evidence that rates of UR correlate with retroelement structural features in the conifers, suggesting that another process is suppressing UR in these species. Opposite the trend for UR, we found the highest rates of GCEs in Norway spruce and maize. Recombination may also resolve as gene conversion, which does not remove sequence, so we analyzed LTR-RT-associated gene conversion events (GCEs) in Norway spruce and six angiosperms. We found the lowest rates of UR in the largest genomes studied, conifers and the angiosperm maize. We employ a novel read-based methodology to estimate the relative rates of LTR-RT-associated UR within the genomes of four conifer and seven angiosperm species. UR is a major mechanism of LTR-RT removal in many angiosperms, but our understanding of LTR-RT-associated recombination within the large, LTR-RT-rich genomes of conifers is quite limited. Unequal recombination (UR) between LTRs leads to removal of intervening sequence and formation of solo-LTRs. In plants, Long Terminal Repeat (LTR) retrotransposons (LTR-RTs) represent the majority of TEs and form most of the nuclear DNA in large genomes. The accumulation and removal of transposable elements (TEs) is a major driver of genome size evolution in eukaryotes.
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