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Oxidative stress (OS), which leads to DNA damage, plays a role in the pathogenesis of Coronavirus disease 2019 (COVID-19). We aimed to evaluate the role of DNA repair gene variants [X-ray repair cross complementing 4 ( XRCC4 ) rs28360071, rs6869366, and X-ray cross-complementary gene 1 ( XRCC1)  rs25487] in susceptibility to COVID-19 in a Turkish population. We also evaluated its effect on the clinical course of the disease. A total of 300 subjects, including 200 COVID-19 patients and 100 healthy controls, were included in this study. These variants were genotyped using polymerase chain reaction (PCR) and/or PCR-restriction fragment length polymorphism (RFLP) methods. The patients were divided into three groups: those with a mild or severe infection; those who died or lived at the 28-day follow-up; those who required inpatient treatment or intensive care. There were 87 women (43.5%) and 113 men (56.5%) in the patient group. Hypertension was the most common comorbidity (26%). In the patient group,  XRCC4  rs6869366 G/G genotype and G allele frequency were increased compared to controls, while  XRCC4  rs6869366 G/T and T/T genotype frequencies were found to be higher in controls compared to patients.  For XRCC1  rs25487, the A/A and A/G genotypes were significantly associated with COVID-19 disease. All of the patients hospitalized in the intensive care unit had the  XRCC4  rs6869366 G/G genotype. In this study, we evaluated for the first time the impact of DNA repair gene variants on COVID-19 susceptibility. Results suggested that  XRCC4  rs6869366 and  XRCC1  rs25487 were associated with COVID-19 suspectibility and clinical course.

The effect of DNA repair gene variants on COVID-19 disease: susceptibility, severity, and clinical course