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Study finds gene network associated with alcohol dependence
Date:11/21/2013

d people linked to information about these individuals' alcohol dependence or other types of addiction.

The research team analyzed the merged SAGE and COGA datasets for genetic variants associated with alcoholism. No single variant was strongly associated with the condition, but when the researchers integrated information about protein-protein interactions from the Human Protein Interaction Network, they identified a network of 39 genes that was not only enriched for alcoholism-associated genes, but also was collectively strongly associated with alcoholism. This strong association held for both European Americans and African Americans.

Furthermore, the team was able to replicate the finding in three additional genetic datasets, two of individuals of European ancestry and one of individuals of African ancestry, suggesting that the findings are robust.

To minimize the possibility of the result being a false positive, the researchers also analyzed the gene network for associations with other complex human diseases - bipolar disorder, depressions and diabetes. The gene network was not associated with any of these conditions.

In addition to finding the highly statistically significant association between the gene network and alcoholism, many of the genes identified also appear to be biologically relevant to brain processes likely to be affected in alcoholism. For example, the network contains genes for ion channel proteins that appear to be involved in tolerance toward some of the physiological effects of alcohol. Other genes code for proteins involved in general brain processes, including synaptic transmission, ion transport, and transmission of nerve impulses.

Having identified this network of genes, Han and his colleagues plan to narrow down the group to look for the genes that cause alcoholism.


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Contact: Jennifer Brown
jennifer-l-brown@uiowa.edu
319-356-7124
University of Iowa Health Care
Source:Eurekalert

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