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- W3014862910 abstract "Reduced representation libraries present an opportunity to perform large scale studies on non-model species without the need for a reference genome. Methods that use restriction enzymes and fragment size selection to help obtain the desired number of loci - such as ddRAD - are highly flexible and therefore suitable to different types of studies. However, a number of technical issues are not approachable without a reference genome, such as size selection reproducibility across samples and coverage across fragment lengths. Moreover, identity thresholds are usually chosen arbitrarily in order to maximize the number of SNPs considering arbitrary parameters. We have developed a strategy to identify de novo a set of reduced-representation single-copy orthologs (R2SCOs). Our approach is based on overlapping reads that recreate original fragments and add information about coverage per fragment size. A further in silico digestion step limits the data to well covered fragment sizes, increasing the chance of covering the majority of loci across different individuals. By using full sequences as putative alleles, we estimate optimal identity thresholds from pairwise comparisons. We have demonstrated our full workflow with data from five sea turtle species. Locus numbers were similar across all species, even at increasing phylogenetics distances. Our results indicated that sea turtles have in general very low levels of heterozygosity. Our approach produced a high-quality set of reference loci, eliminating a series of biological and experimental biases that can strongly affect downstream analysis, and allowed us to explore the genetic variability within and across sea turtle species." @default.
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- W3014862910 date "2020-04-05" @default.
- W3014862910 modified "2023-09-23" @default.
- W3014862910 title "Optimization of ddRAD-like data leads to high quality sets of reduced representation single copy orthologs (R2SCOs) in a sea turtle multi-species analysis" @default.
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