Functional genetic variation in 3'UTR of PARP1 indicates a decreased risk and a better severity of ischemic stroke

Aim of the study: Polymorphisms of DNA repair enzyme gene may alter the ability of damage repair, ischemic stroke susceptibility and outcome. This study aimed to explore the association of polymorphisms in PARP1 and the effects of interactions between genes in Chinese.Materials and methods: A total of 500 patients and 500 healthy controls were enrolled for genotyping. Results: Clinical information analysis revealed higher levels of alcohol and smoking exposure in patients with ischemic stroke, as well as chronic conditions such as diabetes, hypertension, and higher serum triglycerides concentration. In addition, Polymorphism in PARP1 rs8679 was significantly associated with the decreased ischemic stroke risk. Patients harboring the PARP1 rs8679 AG/GG genotype had a better initial stroke, and as for the mRNA level of PARP1, it was suppressed with mutant genotype in comparison with the wild genotype. Finally, the suppressed of PARP1 was induced by gain-binding ability of miR-124-5p through 3'UTR directly binding.Conclusions: In conclusion, our study demonstrates that the SNP rs8679 in PARP1 3'-UTR might act as a protective factor for the outcome of patients with ischemic stroke.