Cancers are a worldwide concern;oral,esophageal and gastrointestinal cancers represent important causes of cancer-related mortality and contribute to a signif icant burden of human health.The DNA repair systems are th...Cancers are a worldwide concern;oral,esophageal and gastrointestinal cancers represent important causes of cancer-related mortality and contribute to a signif icant burden of human health.The DNA repair systems are the genome caretakers,playing a critical role in the initiation and progression of cancers.However,the association between the genomic variations of DNA repair genes and cancer susceptibility is not well understood.This review focuses on the polymorphic genotypes of the non-homologous end-joining DNA repair system,highlighting the role of two genes of this pathway,XRCC5 and XRCC6,in the susceptibility to digestive system cancers and discussing their potential contributions to personalized medicine.展开更多
Objective：To investigate the association between the X-ray repair cross complementing（XRCC） group 5, XRCC6 and XRCC7 polymorphisms and risk of acute myeloid leukemia（AML）. Methods：This hospital-based case-contro...Objective：To investigate the association between the X-ray repair cross complementing（XRCC） group 5, XRCC6 and XRCC7 polymorphisms and risk of acute myeloid leukemia（AML）. Methods：This hospital-based case-control study included 120 AML patients and 210 cancer-free controls in a Chinese population. Three polymorphisms of XRCC5, XRCC6 and XRCC7 were genotyped using the polymerase chain reaction（PCR） or polymerase chain reaction-restriction fragment length polymorphism（PCR-RFLP） method. Results： We found that there was a significant decrease in risk of AML associated with the XRCC6 -61 CG/GG genotype（adjusted odd ratio （OR） = 0.55; 95% confident interval（CI） = 0.34-0.89） compared with the -61CC genotype. For the novel tandem repeat polymorphism （VNTR） in the XRCC5 promoter, we found when the XRCC5 six genotypes were dichotomized（i.e., 2R/2R, 2R/1R versus 2R/0R, 1R/1R, 1R/0R and 0R/0R）, the latter group was associated with increased risk of AML（adjusted OR = 1.67; 95% CI = 1.00-2.79） compared to 2R/ 2R＋2R/1R genotype. However, the XRCC7 6721G〉T polymorphism had no effect on risk of AML. Conclusion：The XRCC6 -61C 〉 G and XRCC5 2R/1R/0R polymorphisms, but not XRCC7 6721G 〉 T polymorphism, could play an important role in the development of AML. Larger scale studies with more detailed data on environment exposure are needed to verify these findings.展开更多
基金Foundation item:The National Basic Research Program of China(grant numbers 2010CB126306&2012CB944504)the National Science Fund for Excellent Young Scholars of NSFC(grant number 31222052)the FEBL grant 2011FBZ23
文摘Cancers are a worldwide concern;oral,esophageal and gastrointestinal cancers represent important causes of cancer-related mortality and contribute to a signif icant burden of human health.The DNA repair systems are the genome caretakers,playing a critical role in the initiation and progression of cancers.However,the association between the genomic variations of DNA repair genes and cancer susceptibility is not well understood.This review focuses on the polymorphic genotypes of the non-homologous end-joining DNA repair system,highlighting the role of two genes of this pathway,XRCC5 and XRCC6,in the susceptibility to digestive system cancers and discussing their potential contributions to personalized medicine.
基金supported in part by National Natural Science Foundation of China(30571541)Natural Science Foundation of Jiangsu Province(BK2006233,BK2005161)+1 种基金Medicine Foundation of Jiangsu Province(H200506)Creative Science Foundation of Nanjing Medical University(CX2004002)
文摘Objective：To investigate the association between the X-ray repair cross complementing（XRCC） group 5, XRCC6 and XRCC7 polymorphisms and risk of acute myeloid leukemia（AML）. Methods：This hospital-based case-control study included 120 AML patients and 210 cancer-free controls in a Chinese population. Three polymorphisms of XRCC5, XRCC6 and XRCC7 were genotyped using the polymerase chain reaction（PCR） or polymerase chain reaction-restriction fragment length polymorphism（PCR-RFLP） method. Results： We found that there was a significant decrease in risk of AML associated with the XRCC6 -61 CG/GG genotype（adjusted odd ratio （OR） = 0.55; 95% confident interval（CI） = 0.34-0.89） compared with the -61CC genotype. For the novel tandem repeat polymorphism （VNTR） in the XRCC5 promoter, we found when the XRCC5 six genotypes were dichotomized（i.e., 2R/2R, 2R/1R versus 2R/0R, 1R/1R, 1R/0R and 0R/0R）, the latter group was associated with increased risk of AML（adjusted OR = 1.67; 95% CI = 1.00-2.79） compared to 2R/ 2R＋2R/1R genotype. However, the XRCC7 6721G〉T polymorphism had no effect on risk of AML. Conclusion：The XRCC6 -61C 〉 G and XRCC5 2R/1R/0R polymorphisms, but not XRCC7 6721G 〉 T polymorphism, could play an important role in the development of AML. Larger scale studies with more detailed data on environment exposure are needed to verify these findings.
