title: DNA repair XRCC1 Arg399Gln polymorphism alone, and in combination with CYP2E1 polymorphisms significantly contribute to the risk of development of childhood acute lymphoblastic leukemia.
abstract: It is now well established that genetic polymorphisms impairing the DNA repair capacity can disrupt the genomic integrity and potentially modulate individual's susceptibility to various cancers. In this study, we investigated the possible association of X-ray repair cross-complimenting group 1 (XRCC1) Arg399Gln and Arg194Trp variants with the risk of incidence of childhood acute lymphoblastic leukemia (ALL) in Turkish population comprised of 190 healthy controls and 167 ALL patients. For Arg399Gln polymorphism, the heterozygous (Arg/Gln) and homozygous mutant (Gln/Gln) genotypes were significantly more common in the ALL patients than the controls (OR: 1.6, p=0.04). Particularly, the Gln399Gln genotype significantly increased the risk of disease up to 2.0-fold (OR: 2.0, p=0.04). Besides, Gln399Gln genotype has been found to be associated with considerably increased risk of ALL among females (OR=2.9, p=0.03). In case of codon 194 polymorphism, no significant associations have been found with risk of childhood ALL. In addition, none of the combinations of XRCC1 codon 194 and 399 polymorphisms have been found to be significantly associated with childhood ALL risk. In the scope of this study, we have also showed that the co-presence of XRCC1 codon 399 and CYP2E1*5B and *6 polymorphisms (data for CYP2E1 polymorphisms drawn from previously published study conducted in our lab) in the same individuals considerably increased the risk for childhood ALL to 3.7-fold with borderline significance (p=0.049). The observed combined effect was considerably more prominent among females (OR=17.4, p=0.001) and need to further investigation. This is the first study showing combined associations of XRCC1 399Gln, CYP2E1*5B and *6 alleles with the risk of development of childhood ALL.
authors.affiliation: Department of Biological Sciences, Middle East Technical University, 06531 Ankara, Turkey. tumertb@gmail.com
authors.forename: Tugba Boyunegmez
authors.initials: TB
authors.lastname: Tumer
authors.forename: Duygu
authors.initials: D
authors.lastname: Yilmaz
authors.forename: Cihan
authors.initials: C
authors.lastname: Tanrikut
authors.forename: Gurses
authors.initials: G
authors.lastname: Sahin
authors.forename: Gulen
authors.initials: G
authors.lastname: Ulusoy
authors.forename: Emel
authors.initials: E
authors.lastname: Arinç
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D019392:Cytochrome P-450 CYP2E1 / Q000235:genetics*; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011110:Polymorphism, Genetic; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000209:etiology / Q000235:genetics*; D012306:Risk; D000076105:X-ray Repair Cross Complementing Protein 1
chemical_list: D004268:DNA-Binding Proteins; D000076105:X-ray Repair Cross Complementing Protein 1; C000619371:XRCC1 protein, human; D019392:Cytochrome P-450 CYP2E1