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Abstract #71358 Published in IGR 18-3
Oxidative DNA damage and reduced expression of DNA repair genes: Role in primary open angle glaucoma (POAG)
Mohanty K; Dada R; Dada TOphthalmic Genetics 2017; 0: 1-5
BACKGROUND: Controversy exists regarding the role of oxidative DNA damage and DNA repair in primary open angle glaucoma (POAG). We performed a case control study to test the hypothesis that oxidative DNA damage and base excision repair (BER) genes PARP1 and OGG1 are involved in POAG pathogenesis. MATERIALS AND METHODS: The study included 116 POAG patients and 116 cataract patients as controls. The 8-hydroxy-2'-deoxyguanosine (8-OHdG) levels were measured by ELISA. RNA was extracted from blood by Trizol and converted to cDNA. The relative quantification of PARP1 and OGG1 genes normalized to β-actin was calculated by the 2(-ΔCt) method. Comparisons between groups were done by student's t-test and correlation between parameters was seen by Pearson correlation coefficient. All p values less than 0.05 were considered significant. RESULTS: Mean levels of 8-OHdG were (patients v/s controls) 19.53 ± 1.40 vs. 15.0 ± 2.6 ng/ml in plasma and 8.55 ± 1.94 vs. 5.15 ± 1.09 ng/ml in aqueous humor (p < 0.0001). Expression levels of PARP1 (0.44 ± 0.05 vs. 0.88 ± 0.04) and OGG1 (0.46 ± 0.05 vs. 0.8 ± 0.01) were significantly (p < 0.0001) less in the patients than controls. There was a significant negative correlation between the expression levels of PARP1 and OGG1 with plasma and aqueous 8-OHdG. There was a strong positive correlation between plasma and aqueous 8-OHdG levels. CONCLUSION: These results support our hypothesis that oxidative stress-induced DNA damage is associated with POAG. Increased oxidative DNA damage in POAG may be attributed to decreased expression of DNA repair enzymes of the BER pathway.
a Department of Ophthalmology , Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences , New Delhi , India.
Full articleClassification:
3.5 Molecular biology incl. SiRNA (Part of: 3 Laboratory methods)
3.4.2 Gene studies (Part of: 3 Laboratory methods > 3.4 Molecular genetics)
3.6 Cellular biology (Part of: 3 Laboratory methods)
