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NIAID media availability: Food allergy-related disorder linked to master allergy gene
Date:3/7/2010

WHAT: Scientists have identified a region of a human chromosome that is associated with eosinophilic esophagitis (EoE), a recently recognized allergic disease. People with EoE frequently have difficulty eating or may be allergic to one or more foods. This study further suggests that a suspected so-called master allergy gene may play a role in the development of this rare but debilitating disorder.

EoE is characterized by inflammation and accumulation of a specific type of immune cell, called an eosinophil, in the esophagus. Symptoms of EoE vary with age: In young children a major symptom is spitting up food, while in older children and adults, the condition may cause food to become stuck in the esophagus. These symptoms may improve when a person with EoE is restricted to a liquid formula diet that contains no protein allergens or is placed on a diet that lacks six highly allergenic foods (milk, soy, eggs, wheat, peanut and seafood). EoE is not the same as more common food allergies, which also have serious consequences. Little is known about what causes EoE, but the disease runs in families suggesting that specific genes may be involved.

Investigators led by Marc Rothenberg, M.D., Ph.D., at Cincinnati Children's Medical Center Hospital, and supported by the National Institute of Allergy and Infectious Diseases and the National Institute of Diabetes and Digestive and Kidney Diseases, both part of the National Institutes of Health, performed a genome-wide association analysis in children with EoE and healthy children. This type of study detects markers of genetic variation across the entire human genome and allows researchers to zero in on a region of a chromosome to identify genes that influence health and the development of disease.

In this study, the investigators identified changes in genes within a region on chromosome 5 that were highly associated with EoE. One of the genes in this region encodes a protein called thymic stromal
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Contact: Julie Wu
wujuli@niaid.nih.gov
301-402-1663
NIH/National Institute of Allergy and Infectious Diseases
Source:Eurekalert

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