Proliferation of Ty3/gypsy-like retrotransposons in hybrid sunflower taxa inferred from phylogenetic data |
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Authors: | Mark C Ungerer Suzanne C Strakosh Kaitlin M Stimpson |
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Affiliation: | (1) Division of Biology, Kansas State University, Manhattan, Kansas, USA;(2) Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA |
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Abstract: | Background Long terminal repeat (LTR) retrotransposons are a class of mobile genetic element capable of autonomous transposition via an RNA intermediate. Their large size and proliferative ability make them important contributors to genome size evolution, especially in plants, where they can reach exceptionally high copy numbers and contribute substantially to variation in genome size even among closely related taxa. Using a phylogenetic approach, we characterize dynamics of proliferation events of Ty3/gypsy-like LTR retrotransposons that led to massive genomic expansion in three Helianthus (sunflower) species of ancient hybrid origin. The three hybrid species are independently derived from the same two parental species, offering a unique opportunity to explore patterns of retrotransposon proliferation in light of reticulate evolutionary events in this species group. |
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