Collaborations with Miral Dizdaroglu: expanding on connections between oxidative DNA damage and aging and disease.

PURPOSE: The goal of this long-term collaboration between Vilhelm A. Bohr and Miral Dizdaroglu was to investigate oxidative DNA damage and DNA repair mechanisms and their links to aging, neurodegeneration, and disease. Using GC/MS assays, the collaboration aimed to identify other endogenous DNA lesions like FapyGua and FapyAde beyond the standard 8-oxo-Gua marker to determine their biological significance and distribution in nuclear and mitochondrial DNA.

RESULTS

DNA Repair Pathways: Identified OGG1 and NTH1 as the primary glycosylases for formamidopyrimidines and demonstrated that CSB protein stimulates NEIL1 activity.Disease & Aging: Found that Cockayne syndrome group B (CSB) and Xeroderma pigmentosum group A (XPA) patients are deficient in repairing specific oxidative lesions, linking these defects to premature aging. In lung cancer, reduced hOGG1 expression correlated with elevated 8-oxo-Gua.Genomic Insights: Initial DNA damage induction was found to be similar in nuclear and mitochondrial DNA, challenging the assumption that mitochondria accumulate significantly more DNA damage.

CONCLUSION

The research established that oxidative damage extends far beyond 8-oxo-Gua and that Base Excision Repair (BER) defects are central to the pathology of cancer and neurodegeneration. The findings emphasize that a multi-lesion approach is essential for understanding the link between oxidative stress and disease.