Stroke is a multiple genetic disease. Platelet-derived growth factor-D has been found to be involved in the pathogenesis of atherosclerosis, suggesting possible association between platelet-derived growth factor-D and the development of ischemic stroke. However, little information on the relationship between platelet-derived growth factor-D and stroke is currently available. The aim of this study was to investigate the association between platelet-derived growth factor-D genetic variation and the risk of ischemic stroke in a Chinese population. We conducted a case-control study with 309 ischemic stroke patients and 309 sex and age (<5 years)-matched controls. DNA was extracted from the whole blood of each participant. Platelet-derived growth factor-D C/G polymorphism at position +3166 (rs7950273) was detected by TaqMan SNP genotyping assay. Overall, the combined rates of platelet-derived growth factor- D CG and GG are 51% in patients in contrast with 46% in controls. There were no significant differences in the genotype frequencies of platelet-derived growth factor-D +3166 polymorphisms between the patients and controls with history or family history of hypertension or diabetes (P = 0.770). However, among people without history or family history of hypertension or diabetes, platelet-derived growth factor-D CG/GG is significantly more frequently expressed in patients (60%) than in controls (43%) (odds ratio 1.97; 95% confidence interval 1.19-3.26). This significant association holds after adjustment for age, sex, smoking and alcohol intaking (odds ratio 1.86; 95% confidence interval 1.11-3.10) (P = 0.018). Our study found that the G allele of rs7950273 of the platelet-derived growth factor-D gene is associated with higher risk of ischemic stroke in a Chinese population without history or family history of hypertension or diabetes. Future studies with larger and ethnically diverse populations are needed to further evaluate the platelet-derived growth factor-D polymorphism and stroke association, as well as its pathophysiological mechanisms.
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