Abstract
PTGDR gene has been identified as an asthma-susceptibility gene. Recently, functional genetic variants have been associated with asthma. The objective of this work was to study -549T>C, -441C>T and -197T>C PTGDR promoter polymorphisms in a Spanish population. In this study, 197 Caucasian individuals were included. Asthma was specialist-physician diagnosed according to the American Thoracic Society (ATS) criteria and classified following the Global Initiative for Asthma (GINA) guidelines. Skin prick tests were performed in all patients. The polymorphisms were analyzed by direct sequencing. -197T>C polymorphism was significantly associated with asthma [Fisher's P-value = 0.007, Monte Carlo P-value (10(4) simulations) = 0.004]. Multivariate analysis adjusted for age and sex confirmed this association with an increased risk of asthma (OR, 3.06; 95% CI, 1.28-7.32; P-value = 0.012). CCT CCC diplotype was associated with asthma (P-value < 0.0001; OR, 1.15; 95% CI, 1.07-1.23), specifically with allergic asthma (P-value < 0.0001). CCT CCC diplotype is unambiguous. All individuals carrying this diplotype had asthma. We identified a specific promoter variant of PTGDR that could be associated with asthma. This diplotype is a combination of...Continue Reading
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