The transposable element Bari-Jheh mediates oxidative stress response in Drosophila.  

The combination of experimental and bioinformatic approaches have allowed researchers to connect a previously identified putatively adaptive Transposable Element (TE) insertion to its relevant fitness effect. The analyzed TE, named Bari-Jheh, adds extra antioxidant response elements (AREs) to the upstream region of Juvenile Hormone Epoxy Hydrolase genes resulting in increased resistance to oxidative stress. Moreover, researchers show that TEs other than Bari-Jheh could also be adding AREs to the upstream regions of other genes suggesting a more general role of TEs in  oxidative stress response.
This study has been performed by researchers from J. Gonzalez Lab. 

Reference article: Guio, L. Barrón M. , González, J. The transposable element Bari-Jheh mediates oxidative stress response in Drosophila. J. Mol Ecol. 2014 Mar 14. doi: 10.1111/mec.12711. [Epub ahead of print]