Abstract
There are many complex interactions between transposable elements (TEs) and host genomes. Environmental changes that induce stressful conditions help to contribute for increasing complexity of these interactions. The transposon mariner-Mos1 increases its mobilization under mild heat stress. It has putative heat shock elements (HSEs), which are probably activated by heat shock factors (HSFs). Ultraviolet radiation (UVC) is a stressor that has been suggested as able to activate heat shock protein genes (Hsp). In this study, we test the hypothesis that if UVC induces Hsp expression, as heat does, it could also promote mariner-Mos1 transposition and mobilization. The Drosophila simulans white-peach is a mutant lineage that indicates the mariner-Mos1 transposition phenotypically through the formation of mosaic eyes. This lineage was exposed to UVC or mild heat stress (28 °C) in order to evaluate the induction of mariner-Mos1 expression by RT-qPCR, as well as the mariner-Mos1 mobilization activity based on the count number of red spots in the eyes. The effects of both treatments on the developmental time of flies and cell cycle progression were also investigated. Both the analysis of eyes and mariner-Mos1 gene expression indicate that UVC radiation has no effect in mariner-Mos1 transposition, although heat increases the expression and mobilization of this TE soon after the treatment. However, the expression of Hsp70 gene increased after 24 h of UVC exposure, suggesting different pathway of activation. These results showed that heat promotes mariner-Mos1 mobilization, although UVC does not induce the expression or mobilization of this TE.
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Acknowledgments
The authors would like to thank the members of the LabDros laboratory group at the Universidade Federal de Santa Maria for comments and discussion relevant to the current study, Daniela Bitencourt Rosa Leal, PhD., and Marcela Zart Arend, MSc., for assistance with the flow cytometry equipment, and Ana Paula Christoff, MSc., for valuable knowledge about RT-qPCR and CNPq and CAPES for financial support.
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Jardim, S.S., Schuch, A.P., Pereira, C.M. et al. Effects of heat and UV radiation on the mobilization of transposon mariner-Mos1 . Cell Stress and Chaperones 20, 843–851 (2015). https://doi.org/10.1007/s12192-015-0611-2
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DOI: https://doi.org/10.1007/s12192-015-0611-2