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Fossilized human feces from 14th century contain antibiotic resistance genes
Date:2/27/2014

A team of French investigators has discovered viruses containing genes for antibiotic resistance in a fossilized fecal sample from 14th century Belgium, long before antibiotics were used in medicine. They publish their findings ahead of print in the journal Applied and Environmental Microbiology.

"This is the first paper to analyze an ancient DNA viral metagenome," says Rebecca Vega Thurber of Oregon State University, Corvallis, who was not involved in the research.

The viruses in the fecal sample are phages, which are viruses that infect bacteria, rather than infecting eukaryotic organisms such as animals, plants, and fungi. Most of the viral sequences the researchers found in the ancient coprolite (fossil fecal sample) were related to viruses currently known to infect bacteria commonly found in stools (and hence, in the human gastrointestinal tract), including both bacteria that live harmlessly, and even helpfully in the human gut, and human pathogens, says corresponding author Christelle Desnues of Aix Marseille Universit.

The communities of phage within the coprolite were different, taxonomically, from communities seen within modern human fecal samples, but the functions they carry out appear to be conserved, says Desnues. That reinforces the hypothesis that the viral community plays a fundamental role within the human gastrointestinal tract, and one which remains unchanged after centuries, even while the human diet and other human conditions have been changing.

Over the last five years, considerable evidence has emerged that bacteria inhabiting the gut play an important role in maintaining human health, for example, as part of the human metabolic system, says Desnues. Her own research suggests that the bacteriophage infecting the gut bacteria may help maintain these bacteria. Among the genes found in the phage are antibiotic resistance genes and genes for resistance to toxic compounds. Both toxins and antibioti
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Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

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