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Transcriptional dynamics of LTR retrotransposons in early generation and ancient sunflower hybrids.
Genome Biol Evol. 2013; 5(2):329-37.GB

Abstract

Hybridization and abiotic stress are natural agents hypothesized to influence activation and proliferation of transposable elements in wild populations. In this report, we examine the effects of these agents on expression dynamics of both quiescent and transcriptionally active sublineages of long terminal repeat (LTR) retrotransposons in wild sunflower species with a notable history of transposable element proliferation. For annual sunflower species Helianthus annuus and H. petiolaris, neither early generation hybridization nor abiotic stress, alone or in combination, induced transcriptional activation of quiescent sublineages of LTR retrotransposons. These treatments also failed to further induce expression of sublineages that are transcriptionally active; instead, expression of active sublineages in F1 and backcross hybrids was nondistinguishable from, or intermediate relative to, parental lines, and abiotic stress generally decreased normalized expression relative to controls. In contrast to findings for early generation hybridization between H. annuus and H. petiolaris, ancient sunflower hybrid species derived from these same two species and which have undergone massive proliferation events of LTR retrotransposons display 2× to 6× higher expression levels of transcriptionally active sublineages relative to parental sunflower species H. annuus and H. petiolaris. Implications and possible explanations for these findings are discussed.

Authors+Show Affiliations

Division of Biology, Kansas State University, KS, USA. mcungere@ksu.eduNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

23335122

Citation

Ungerer, Mark C., and Takeshi Kawakami. "Transcriptional Dynamics of LTR Retrotransposons in Early Generation and Ancient Sunflower Hybrids." Genome Biology and Evolution, vol. 5, no. 2, 2013, pp. 329-37.
Ungerer MC, Kawakami T. Transcriptional dynamics of LTR retrotransposons in early generation and ancient sunflower hybrids. Genome Biol Evol. 2013;5(2):329-37.
Ungerer, M. C., & Kawakami, T. (2013). Transcriptional dynamics of LTR retrotransposons in early generation and ancient sunflower hybrids. Genome Biology and Evolution, 5(2), 329-37. https://doi.org/10.1093/gbe/evt006
Ungerer MC, Kawakami T. Transcriptional Dynamics of LTR Retrotransposons in Early Generation and Ancient Sunflower Hybrids. Genome Biol Evol. 2013;5(2):329-37. PubMed PMID: 23335122.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Transcriptional dynamics of LTR retrotransposons in early generation and ancient sunflower hybrids. AU - Ungerer,Mark C, AU - Kawakami,Takeshi, PY - 2013/1/22/entrez PY - 2013/1/22/pubmed PY - 2013/9/7/medline SP - 329 EP - 37 JF - Genome biology and evolution JO - Genome Biol Evol VL - 5 IS - 2 N2 - Hybridization and abiotic stress are natural agents hypothesized to influence activation and proliferation of transposable elements in wild populations. In this report, we examine the effects of these agents on expression dynamics of both quiescent and transcriptionally active sublineages of long terminal repeat (LTR) retrotransposons in wild sunflower species with a notable history of transposable element proliferation. For annual sunflower species Helianthus annuus and H. petiolaris, neither early generation hybridization nor abiotic stress, alone or in combination, induced transcriptional activation of quiescent sublineages of LTR retrotransposons. These treatments also failed to further induce expression of sublineages that are transcriptionally active; instead, expression of active sublineages in F1 and backcross hybrids was nondistinguishable from, or intermediate relative to, parental lines, and abiotic stress generally decreased normalized expression relative to controls. In contrast to findings for early generation hybridization between H. annuus and H. petiolaris, ancient sunflower hybrid species derived from these same two species and which have undergone massive proliferation events of LTR retrotransposons display 2× to 6× higher expression levels of transcriptionally active sublineages relative to parental sunflower species H. annuus and H. petiolaris. Implications and possible explanations for these findings are discussed. SN - 1759-6653 UR - https://www.unboundmedicine.com/medline/citation/23335122/Transcriptional_dynamics_of_LTR_retrotransposons_in_early_generation_and_ancient_sunflower_hybrids_ L2 - https://academic.oup.com/gbe/article-lookup/doi/10.1093/gbe/evt006 DB - PRIME DP - Unbound Medicine ER -