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International study suggests human genes influence gut microbial composition
Date:1/7/2013

New research led by the Karolinska Institutet, Sweden and the University of Glasgow, Scotland, has identified a link between a human gene and the composition of human gastrointestinal bacteria. In a study published as a letter to the journal Gut, the team outline new evidence suggesting that the human genome may play a role in determining the makeup of the billions of microbes in the human gastrointestinal tract collectively known as the gut microbiota.

Mauro D'Amato, Associate Professor at the Department of Biosciences and Nutrition at Karolinska Institutet, said: "The hypothesis that our genes contribute to tailor-make our microbiota is very attractive. We still do not know whether certain DNA variations can result in the assembling and perpetuation of specific microbiota profiles, and this may bear important implications for the potential to treat common diseases through therapeutic modification of the gut flora."

The microbiota, which evolved over tens of thousands of years alongside their human hosts, constitutes a complex and diverse community whose exact composition varies from person to person. It has numerous beneficial physiological and nutritional effects for humans; however, alterations in its bacterial composition have been linked to health problems including obesity and Crohn's disease.

Dr Christopher Quince, of the University of Glasgow's School of Engineering, said: "We ran a statistical analysis on bacterial DNA sequenced from samples of intestinal tissue from 51 healthy people with no history of bowel conditions in relation to 30 specific genes. These genes have been shown to increase the risk of Crohn's disease, and are likely to play an important role in gut-bacteria interactions. We found that DNA variation in one of these genes, known as IRGM, was associated with the presence of increased levels of a type of microbe known as Prevotella."

The research thus suggests that the IRGM gene coul
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Karolinska Institutet
Source:Eurekalert

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