PLOS Genetics: A Review of Bacteria-Animal Lateral Gene Transfer May Inform Our Understanding of Diseases like Cancer

 Interesting conclusions:

Extensive lateral gene transfer (LGT)  has been detected between bacteria and animals, particularly between endosymbionts and their hosts. Recent LGT may be associated specifically with endosymbionts that colonize germ cells and the germ stem cell of their respective hosts. The extensive LGT observed between Wolbachia endosymbionts and their invertebrate hosts suggests that LGT involving bacteria and animals may occur more frequently than was thought a decade ago. While vertebrates have an immune system and segregated gametes that may prevent transfers like those seen in invertebrates, transfers to the vertebrate somatic genome have not been appreciated and warrant further examination. Bacterial DNA integration may be a mutagen associated with noninherited genetic diseases, like cancer, as described in a recent paper demonstrating LGT from Acinetobacter spp. in leukemia samples and from Pseudomonas spp. in stomach cancer samples.

Viruses (other than retroviruses) also appear to have been integrated into animal genomes 
See :- 

Endogenous viral elements in animal genomes Katsourakis and Gifford, 2010  

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