From Phys.org:
Far from just being the product of our parents, University of Adelaide scientists have shown that widespread transfer of genes between species has radically changed the genomes of today’s mammals, and been an important driver of evolution.
In the world’s largest study of so-called “jumping genes”, the researchers have traced two particular jumping genes across 759 species of plants, animals and fungi. These jumping genes are actually small pieces of DNA that can copy themselves throughout a genome and are known as transposable elements.
They have found that cross-species transfers, even between plants and animals, have occurred frequently throughout evolution.
Both of the transposable elements they traced—L1 and BovB—entered mammals as foreign DNA. This is the first time anyone has shown that the L1 element, important in humans, has jumped between species.
More here. [Thanks to Yohan John.]