Comparison of taxon-specific versus general locus sets for targeted sequence capture in plant phylogenomics

植物系统基因组学中针对性序列捕获的分类单元特异性与一般基因座集的比较

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作者:John H Chau, Wolfgang A Rahfeldt, Richard G Olmstead

Discussion

General locus sets can be a useful source of sequence capture targets, especially if multiple genomic resources are not available for a taxon.

Methods

We identify and compare a taxon-specific locus set and three general locus sets (conserved ortholog set [COSII], shared single-copy nuclear [APVO SSC] genes, and pentatricopeptide repeat [PPR] genes) for targeted sequence capture in Buddleja (Scrophulariaceae) and outgroups. We evaluate their performance in terms of assembly success, sequence variability, and resolution and support of inferred phylogenetic trees.

Results

The taxon-specific locus set had the most target loci. Assembly success was high for all locus sets in Buddleja samples. For outgroups, general locus sets had greater assembly success. Taxon-specific and PPR loci had the highest average variability. The taxon-specific data set produced the best-supported tree, but all data sets showed improved resolution over previous non-sequence capture data sets.

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