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  • Title: RAD52 polymorphisms contribute to the development of papillary thyroid cancer susceptibility in Middle Eastern population.
    Author: Siraj AK, Al-Rasheed M, Ibrahim M, Siddiqui K, Al-Dayel F, Al-Sanea O, Uddin S, Al-Kuraya K.
    Journal: J Endocrinol Invest; 2008 Oct; 31(10):893-9. PubMed ID: 19092295.
    Abstract:
    Genetic polymorphisms of DNA repair genes seem to determine the DNA repair capacity. We hypothesized that polymorphisms of genes responsible for DNA repair may be associated with risk of thyroid cancer. To evaluate the role of genetic polymorphisms of DNA repair genes in thyroid cancer, we conducted a hospital-based case-control study in Saudi population. Two hundred and twenty-three incident papillary thyroid cancer cases and 229 controls recruited from Saudi Arabian population were analyzed for 21 loci in 8 selected DNA repair genes by PCR-restriction fragment length polymorphism including non-homologous end joining pathway genes LIGIV (LIGlV ASP62HIS, PRO231SER, TRP46TER), XRCC4 Splice 33243301G>A and XRCC7 ILE3434THR; homologous recombination pathway genes XRCC3 ARG94HIS and THR241MET, RAD51 UTR 15452658T>C, 15455419A>G, RAD52 2259 and GLN221GLU, conserved DNA damage response gene Tp53 PRO47SER, PRO72ARG, Tp53 UTR 7178189A>C and base excision repair gene XRCC1 ARG194TRP, ARG280HIS, ARG399GLN, ARG559GLN. RAD52 GLN221GLU genotypes CG and variants carrying G allele showed statistical significance and very high risk of developing thyroid cancer compared to wild type [CG vs CC; p<0.001, odds ratio (OR)=15.57, 95% confidence interval (CI)=6.56-36.98, CG+GG vs CC; p<0.001, OR=17.58, 95% CI=7.44-41.58]. Similarly, RAD52 2259 genotypes CT and variant allele T showed a significant difference in terms of risk estimation (CT vs CC; p<0.05, OR=1.53, 95% CI=1.03-2.28, CT+TT vs CC; p<0.001, OR=1.922, 95% CI=1.31-2.82). Remaining loci demonstrated no significance with risk. Of the 21 loci screened, RAD52 2259 and RAD52 GLN221GLU may be of importance to disease process and may be associated with papillary thyroid cancer risk in Saudi Arabian population.
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