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Genetic Variation in Some Smokers Increases Chances of Developing COPD

A new study has found that some smokers have genetic predisposition to develop chronic obstructive pulmonary disease (COPD).

The research from Wake Forest University School of Medicine demonstrated that a genetic variation in some people increases their chances of developing COPD if they smoke tobacco.

"The genetic variant we studied seemed harmless on its own. But when someone has this variant, there is more of an adverse effect of smoking on lung function. Therefore, in combination with smoking, this genetic variant represents a risk factor for COPD," said Alireza Sadeghnejad, M.D., Ph.D., lead author.

The researchers studied two variations (-1112C and -1112T) of the interleukin-13 (IL-13) gene. The gene is responsible for the production of the IL-13 protein that is involved in pulmonary inflammation and susceptibility to COPD.

Everyone has two copies of the gene, one inherited from each parent. The investigation suggests that having two copies of -1112T in the IL-13 gene is associated with a more profound adverse effect of cigarette smoking on lung function.

Researchers examined 1,073 men at least 40 years old who had smoked 20 or more pack-years. One pack-year is equal to smoking one pack a day for a year. Participants underwent genetic testing and a pulmonary function test known as Forced Expiratory Volume, which is the volume of air that can be forced out in one second after taking a deep breath.

Jill Ohar, M.D., senior researcher and a professor of internal medicine-pulmonary, said it's likely that -1112C/T is one of several genetic variants that influence the risk of a smoker developing COPD. About 25 percent of smokers develop the disease, suggesting that genetic factors, in addition to environmental exposure (in this case cigarette smoking), play a role.

"This finding may help us to understand why some smokers develop COPD and improve our understanding of
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