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Comparative genome-wide analysis of repetitive DNA in the genus Populus L.

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Abstract

Genome skimming was performed, using Illumina sequence reads, in order to obtain a detailed comparative picture of the repetitive component of the genome of Populus species. Read sets of seven Populus and two Salix species (as outgroups) were subjected to clustering using RepeatExplorer (Novák et al. BMC Bioinformatics 11:378 2010). The repetitive portion of the genome ranged from 33.8 in Populus nigra to 46.5% in Populus tremuloides. The large majority of repetitive sequences were long terminal repeat-retrotransposons. Gypsy elements were over-represented compared to Copia ones, with a mean ratio Gypsy to Copia of 6.7:1. Satellite DNAs showed a mean genome proportion of 2.2%. DNA transposons and ribosomal DNA showed genome proportions of 1.8 and 1.9%, respectively. The other repeat types accounted for less of 1% each. Long terminal repeat-retrotransposons were further characterized, identifying the lineage to which they belong and studying the proliferation times of each lineage in the different species. The most abundant lineage was Athila, which showed large differences among species. Concerning Copia lineages, similar transpositional profiles were observed among all the analysed species; by contrast, differences in transpositional peaks of Gypsy lineages were found. The genome proportions of repeats were compared in the seven species, and a phylogenetic tree was built, showing species separation according to the botanical section to which the species belongs, although significant differences could be found within sections, possibly related to the different geographical origin of the species. Overall, the data indicate that the repetitive component of the genome in the poplar genus is still rapidly evolving.

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Acknowledgements

This research work was supported by the Department of Agriculture, Food and Environment, University of Pisa, Italy, project Plantomics.

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Correspondence to Andrea Cavallini.

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Communicated by P. Ingvarsson

Data archiving statement

All genomic DNA raw Illumina sequences used in this work are available at the NCBI Sequence Read Archive under the accession numbers SRS1328499 (Populus deltoides), SRS1218640 (P. nigra), SRS1124263 (P. tremula), SRS1124888 (P. tremuloides), SRS1115969 (P. balsamifera), SRS829341 (P. simonii), SRS844395 (P. trichocarpa), SRS161420 (Salix purpurea), and SRS1276361 (S. suchowensis).

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Usai, G., Mascagni, F., Natali, L. et al. Comparative genome-wide analysis of repetitive DNA in the genus Populus L.. Tree Genetics & Genomes 13, 96 (2017). https://doi.org/10.1007/s11295-017-1181-5

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