(HealthDay News) -- Living in a home with high levels of mold may increase the risk of severe asthma attacks in people with certain gene variants, finds a new study.

"We found that the interaction between environmental mold exposure and certain variants of chitinase genes were positively associated with severe asthma exacerbations requiring hospitalization," lead researcher Ann Wu, an assistant professor at Harvard Medical School and Harvard Pilgrim Health Care Institute, said in an American Thoracic Society news release.

Chitinases, which break down a component in fungi called chitin, are induced during allergic inflammation. It's known that people with asthma have higher expression of certain variants of chitinase.

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