Natural GMOs Part 205. Besides giving bees a buzz, coffee is host to genes that move between species and to new locations on chromosomes:

At Science magazine:

We annotated 25,574 protein-coding genes [of the coffee genome]  (table S6), 92 microRNA precursors, and 2573 organellar-to-nuclear genome transfers. Transposable elements account for ~50% of the genome , of which ~85% are long terminal repeat (LTR) retrotransposons. Large-scale comparison between Coffea. canephora LTR retrotransposons and those of reference plant genomes shows outstanding conservation of several Copia groups across distantly related genomes, suggesting that horizontal mobile element transfers may be more frequent than generally recognized (5–8).

In 

France Denoeud and coffee drinking crew. The coffee genome provides insight into the convergent evolution of caffeine biosynthesis Science 5 September 2014:  Vol. 345 no. 6201 pp. 1181-1184 DOI: 10.1126/science.1255274

Citing

REF 5 S. Schaack, C. Gilbert, C. Feschotte, Promiscuous DNA: Horizontal transfer of transposable elements and why it matters for eukaryotic evolution. Trends Ecol. Evol. 25, 537–546 (2010).

REF 6 A. Roulin, B. Piegu, P. M. Fortune, F. Sabot, A. D’Hont, D. Manicacci, O. Panaud, Whole genome surveys of rice, maize and sorghum reveal multiple horizontal transfers of the LTR-retrotransposon Route66 in Poaceae. BMC Evol. Biol. 9, 58 (2009). 

Ref 7 M. El Baidouri, M. C. Carpentier, R. Cooke, D. Gao, E. Lasserre, C. Llauro, M. Mirouze, N. Picault, S. A. Jackson, O. Panaud, Widespread and frequent horizontal transfers of transposable elements in plants. Genome Res. 24, 831–838 (2014).

REF 8. C. Moisy, A. H. Schulman, R. Kalendar, J. P. Buchmann, F. Pelsy, The Tvv1 retrotransposon family is conserved between plant genomes separated by over 100 million years. Theor. Appl. Genet. 127, 1223–1235 (2014).