HybSeq

Hybridization is a widespread phenomenon in the evolution of plants and exploring its role is crucial to understanding diversification processes of many taxonomic groups. Recently, more attention is focused on the role of ancient hybridization that has repeatedly been shown as triggers of evolutionary radiation, although in some cases, it can prevent further diversification. The causes, frequency, and consequences of ancient hybridization remain to be explored.

Elucidating the evolution of recently diverged and polyploid-rich plant lineages may be challenging even with high-throughput sequencing, both for biological reasons and bioinformatic difficulties. Here, we apply target enrichment with genome skimming (Hyb-Seq) to unravel the evolutionary history of the Alyssum montanum-A. repens species complex. Reconstruction of phylogenetic relationships in diploids supported recent and rapid diversification accompanied by reticulation events.

Praktický kurz fylogenomických metod se zaměřením na NGS metodu Hyb-Seq. Metoda Hyb-Seq kombinuje cílené obohacení a tzv. mělké sekvenování genomu. V rámci kurzu budou probrány základy i nejnovějších poznatky v oblasti Hyb-Seq (návrh sond, laboratorní postup, analýza dat). Součástí kurzu je i práce s daty a jejich praktické analýzy různými přístupy, od primárních dat po konstrukci evolučních stromů koalescenčními a dalšími metodami. V laboratorní části kurzu budou připravovány a obohacovány NGS knihovny s využitím sonikátoru.

Non-coding repetitive DNA (repeatome) is an active part of the nuclear genome, involved in its structure, evolution and function. It is dominated by transposable elements (TEs) and satellite DNA and is prone to the most rapid changes over time. The TEs activity presumably causes the global genome reorganization and may play an adaptive or regulatory role in response to environmental challenges.

Praktický kurz fylogenomických metod se zaměřením na NGS metodu Hyb-Seq. Metoda Hyb-Seq kombinuje cílené obohacení a tzv. mělké sekvenování genomu. V rámci kurzu budou probrány základy i nejnovějších poznatky v oblasti Hyb-Seq (návrh sond, laboratorní postup, analýza dat). Součástí kurzu je i práce s daty a jejich praktické analýzy různými přístupy, od primárních dat po konstrukci evolučních stromů koalescenčními a dalšími metodami. V laboratorní části kurzu budou připravovány a obohacovány NGS knihovny s využitím sonikátoru.

Custom probe design for target enrichment in phylogenetics is tedious and often hinders broader phylogenetic synthesis. The universal angiosperm probe set Angiosperms353 may be the solution. Here, we test the relative performance of Angiosperms353 on the Rosaceae subtribe Malinae in comparison with custom probes that we specifically designed for this clade. We then address the impact of bioinformatically altering the performance of Angiosperms353 by replacing the original probe sequences with orthologs extracted from the Malus domestica genome.

Intensive 4-days (5^th day is not compulsory, but is open for any discussion, if there would be interest) course to learn all theory about HybSeq and practically learn how to analyze HybSeq data, how to solve all problems, and how to evaluate differences among gene trees. Important part is enough time to discuss everything, including practical problems and projects of individual participants.

Poster presented at Botany 2018 conference of the Botanical Society of America titled Hunting the treasure of Cape Oxalis diversity (Zeisek, Oberlander, Dreyer, Schmickl, Schneeweiss):

Phylogenetics benefits from using a large number of putatively independent nuclear loci and their combination with other sources of information, such as the plastid and mitochondrial genomes. To facilitate the selection of orthologous low-copy nuclear (LCN) loci for phylogenetics in non-model organisms, we created an automated and interactive script to select hundreds of LCN loci by a comparison between transcriptome and genome skim data. We used our script to obtain LCN genes for southern African Oxalis (Oxalidaceae), a speciose plant lineage in the Greater Cape Floristic Region.