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| Until now, scientists did no know how much or how rapidly this information was being exchanged, however, MIT researchers have managed to illustrate the vast scale and rapid speed with which genes can proliferate across bacterial lineages. Alm, the Karl Van Tassel Associate Professor explains: We are finding <completely> identical genes in bacteria that are as divergent from each other as a human is to a yeast. This shows that the transfer is recent; the gene hasn't had time to mutate. Computational systems biology graduate student Chris Smillie, one of the lead authors of the paper says: We were surprised to find that 60% of transfers among human-associated bacteria include a gene for antibiotic resistance. These resistance genes might be associated with using antibiotics in industrial agriculture because researchers discovered 42 antibiotic-resistance genes that were shared between livestock- and human-associated bacteria. This demonstrates a crucial link that connects pools of drug resistance in human and agricultural populations. Alm comments: Somehow, even though a billion years of genome evolution separate a bacterium living on a cow and a bacterium living on a human, both are accessing the same gene library.
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It's powerful circumstantial evidence that genes are being transferred between food animals and humans. The researchers furthermore identified 43 independent cases of antibiotic-resistance genes crossing between nations. Mark Smith, microbiology graduate student and also a lead author of the study warns: This is a real international problem. Once a trait enters the human-associated gene pool, it spreads quickly without regard for national borders. has a widespread practice of adding prophylactic antibiotics to animal feed to promote growth and prevent the spread of disease in densely housed herds and flocks.
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