Polymorphisms in DNA repair genes – assessment of frequencies and effect on the level of DNA oxidative damage caused by lead
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Pracownia Toksykologii Genetycznej, Instytut Medycyny Pracy i Zdrowia Środowiskowego. Dyrektor: dr n. med. P. Z. Brewczyński
Śląski Uniwersytet Medyczny w Katowicach, Wydział Lekarski w Katowicach, Katedra i Zakład Biologii Molekularnej i Genetyki. Kierownik Katedry: prof. dr hab. n. med. A. L. Sieroń
Elżbieta Olewińska   

Pracownia Toksykologii Genetycznej Instytut Medycyny Pracy i Zdrowia Środowiskowego ul. Kościelna 13; 41-200 Sosnowiec tel. (32) 266 08 85; fax. (32) 266 11 24
Med Srod. 2014;17(4):29–37
The aim of this study was to evaluate the effect of polymorphisms in DNA repair genes: APE1, hOGG1, XRCC1, XPA on the level of oxidative damage to DNA as well as an assessment of the frequencies of genetic polymorphisms in the adult population of Caucasians from southern Poland.

Material and Methods:
We examined a group of 115 men occupationally exposed to lead and 58 men with no history of occupational exposure to lead. The concentrations of lead in blood, zinc protoporphyrin in blood and 8-hydroxy-2-deoxyguanosine in urine were measured. The identification of SNP polymorphisms in genes encoding enzymes involved in DNA repair (APEX1, hOGG1, XPA, XRCC1) was performed using real-time PCR with TaqMan probes. We analyzed polymorphisms: APEX1 (rs1130409, Asp148Glu), hOGG1 (rs1052133, Ser326Cys), XPA (rs1800975, -4A/G) and XRCC1 (rs25487, Gln399Arg).

The mean blood lead level in the exposed group was 33,48 μg/dl and was significantly higher compared to 5.35 μg/dl (p=0.000). in the control group. The frequencies of studied polymorphisms were comparable in both groups, with the exception of -4A/G (rs1800975) in the gene XPA (p<0.0001).

Differences were observed between genotypes in -4A/G (rs1800975) polymorphism in relations to the level of lead in blood (p=0.006) and Ser326Cys (rs1052133) polymorphism in relations to 8-hydroxy-2- deoxyguanosine in urine (p=0.01).

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