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Moldy homes a serious risk for severe asthma attacks in some
Date:6/23/2010

ngle "letter" of the DNA code in a given gene is differentof chitinase genes and a chitinase-like gene within the study population.

They then analyzed the appearance of different variations of chitinase genes with level of mold exposure and number of hospital visits from severe asthma exacerbations. They found that certain variants of the chitinase gene CHIT1, in conjunction with high mold exposure, were associated with increased risk of severe asthma attacks.

"Our results support increasing evidence that CHIT1, which is primarily expressed in the lung, plays an important role in the pathophysiology of asthma in the proper environmental context of exposure to chitin, which was approximated by mold levels," said Dr. Wu. "To our knowledge this was the first study to examine the effect of mold levels on the association of SNPs in the genes of both chitinases and chitinase-like proteins with asthma and allergy-related phenotypes."

Chitinases may play a role in future targets for asthma therapy. Inhibition of chitinase enzymatic activity has been demonstrated to prevent hyper-responsiveness and inflammation in mice. It is plausible, said Wu, that therapeutics designed to block chitinase enzyme activity may prevent hyper-responsiveness and inflammation related to asthma.

"Future research should focus on expanding and replicating these findings," she said. "The focus should be on mechanisms of chitinases and chitinase-like proteins in allergic inflammation. Additionally, finding other genes that may interact with mold exposure will also be important. We plan to find a population to replicate these findings. Additionally, we are preparing to perform a Genome-Wide Association Study in this same population to identify other genes that may interact with mold exposure."


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Contact: Keely Savoie
ksavoie@thoracic.org
212-315-8620
American Thoracic Society
Source:Eurekalert

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