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Department of Internal Medicine, Kyungpook National University Hospital, Samduk 2ga 50, Taegu, 700-412 [J. Y. P., N. C. B., S. C. C., C. H. K., T. H. J.]; Department of Internal Medicine, School of Medicine, Keimyung University, Dongsan Dong 194, Taegu, 700-712 [J-H. P.]; and Cancer Research Institute [J. Y. P., S. Y. L., S. J.], Departments of Biochemistry [H-S. J., I. S. K.] and Preventive Medicine [S. K.], School of Medicine, Kyungpook National University, Dong In 2Ga 101, Taegu, 700-422, Korea
| Abstract |
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40 pack-years, >40 pack-years), the Gln allele was associated with an increased risk for squamous cell carcinoma only in the group of individuals having
40 pack-years of smoking (Arg/Gln genotype: adjusted OR = 1.48, 95% CI = 0.782.8; Gln/Gln genotype: adjusted OR = 5.75, 95% CI = 1.4622.69). These results suggest that XRCC1 codon 399 polymorphism may be an important genetic determinant of squamous cell carcinoma of the lung in persons with lower degrees of cigarette use. | Introduction |
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DNA repair systems are fundamental to the maintenance of genomic integrity in the face of replication errors, environmental insults, and the cumulative effects of age, and their inactivation can dramatically increase individual susceptibility to cancer (5 , 6) . In humans, >70 genes are involved in the five major DNA repair pathways: direct repair, BER3 , NER, mismatch repair, and double-strand break repair (7 , 8) . NER targets bulky, helix-distorting adducts, such as benzo(a)pyrene-guanine adduct, whereas BER removes small base adducts produced by oxidation, methylation, and radiation (7, 8, 9) .
XRCC1 acts as a facilitator or coordinator in BER, through its interaction with poly(ADP-ribose) polymerase, DNA polymerase ß, and DNA ligase III (9, 10, 11, 12) . Shen et al. (13) identified three coding polymorphisms in the XRCC1 gene at the codons 194 (Arg to Trp), 280 (Arg to His), and 399 (Arg to Gln). Whereas the functional effects of these polymorphisms in XRCC1 has not been well known, amino acid changes at evolutionary conserved regions may alter its function. In particular, the 399Gln polymorphism resulting from a guanine to adenine nucleotide occurs in the poly(ADP-ribose) polymerase binding domain and may affect complex assembly or repair efficiency. Lunn et al. (14) reported that the 399Gln allele was significantly associated with higher levels of aflatoxin B1-DNA adducts and glycophorin A somatic mutations. Duell et al. (15) reported that sister chromatid exchange frequencies were higher in carriers of the 399Gln allele than in homozygous carriers of the 399Arg allele. These studies (14 , 15) suggest that individuals with the 399Gln allele are less able to repair DNA damage.
Epidemiological characteristics of lung cancer in Korea are remarkably different from those of Western countries. In Korea, lung cancer occurs predominantly in male smokers, and squamous cell carcinoma is the most frequent histological type, which may be because of a very high smoking rate among males (68.3%) and a contrastingly low smoking rate among females (6%; Refs. 16 and 17 ). To determine whether the XRCC1 399Gln allele is a risk factor for lung cancer in Korea, we performed RFLP analysis of the codon 399 polymorphism of XRCC1 gene in a hospital-based case control study of lung cancer.
| Materials and Methods |
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Statistical Analysis.
The comparison of age and pack-years of smoking was performed by Students t test and the comparison of smoking status (current/former/never) by
2 test. The statistical significance of the differences in the frequencies of XRCC1 codon 399 genotypes between groups was calculated by
2 test. Hardy-Weinberg equilibrium was tested by a goodness-of-fit
2 test to compare the observed genotype frequencies with the expected genotype frequencies among the cases and controls. The ORs and 95% CIs were obtained using unconditional logistic regression analysis. Crude ORs and ORs adjusted for age and pack-years as continuous variables were calculated. To analyze the association between genotype and lung cancer risk after stratification into cigarette consumption (
40 pack-years and >40 pack-years), multiple logistic regression analysis was performed after adjusting age. Trends test for the number of polymorphic alleles on lung cancer risk was conducted by a Mantel-Haenszel
2 test. All analyses were performed using Statistical Analysis Software for Windows, version 6.12 (SAS institute, Cary, NC).
| Results |
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The distributions of XRCC1 genotypes and 399Gln allele frequencies among controls and cases are shown in Table 2
. The distribution of genotypes was in Hardy-Weinberg equilibrium. No significant deviation was observed for the distribution of genotypes between cases and controls. When the cases were categorized by histological type, however, the frequencies of Arg/Arg, Arg/Gln, and Gln/Gln genotypes in the squamous cell carcinoma group (46, 41.4, and 12.6%, respectively) were significantly different from those among controls (60, 35.6, and 4.4%, respectively, P < 0.05). The frequencies of genotypes in the groups of adenocarcinoma and small cell carcinoma were similar to those of controls.
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40 pack-years and >40 pack-years) is shown in Table 4
40 pack-years of smoking, the 399Gln allele was associated with a borderline significantly increased risk for squamous cell carcinoma (adjusted OR = 1.79, 95% CI = 0.983.28), and the risk for the disease was increased as the number of Gln alleles increased (Arg/Gln genotype: adjusted OR = 1.48, 95% CI = 0.782.8; Gln/Gln genotype: adjusted OR = 5.75, 95% CI = 1.4622.69). In the group of individuals with >40 pack-years of smoking, however, the distribution of XRCC1 genotypes was not significantly different between squamous cell carcinoma cases and controls.
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| Discussion |
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Three coding polymorphisms at conserved sites have been reported in the XRCC1 gene (13) . In this study, we focused on the codon 399 polymorphism because two other polymorphisms (codons 194 and 280) reside in functionally insignificant regions (9 , 13) . The frequency of the 399Gln allele among the healthy Koreans in this study was 0.22, which was lower than those in Chinese, Taiwanese (both 0.26; Refs. 14 and 18 ), and Caucasians (0.320.37; Refs. 14 and 19, 20, 21 ).
We demonstrated that the 399Gln allele was associated with an increased risk for squamous cell carcinoma of the lung. These results are consistent with previous studies that the Gln/Gln genotype is the risk genotype for various smoking-related cancers (18
, 20
, 21)
. A characteristic finding in this study is that there was a gene-dosage effect with the 399Gln allele (test for linear association,
2 = 7.3, P = 0.007). In previous studies (18
, 20
, 21)
, the Arg/Gln genotype was classified in the same group with the Arg/Arg or Gln/Gln genotype according to the distribution of genotypes in controls and cases. Therefore, it has not been determined if individuals carrying one Gln allele have an increased risk for cancer. In the current study, however, individuals heterozygous for the 399Gln allele had an intermediate risk for the cancer. This finding confirms the study of Lunn et al. (14)
, in which the levels of aflatoxin B1-DNA adducts and glycophorin A somatic mutations were highest in individuals with two Gln alleles, intermediate with one allele, and lowest with no Gln allele.
A few studies have investigated the potential role of XRCC1 codon 399 polymorphism on lung cancer risk, but the results were inconsistent (21 , 22) . Butkiewicz et al. (22) found no association of lung cancer with this polymorphism in the Polish population. Divine et al. (21) reported that the Gln/Gln genotype was associated with an increased risk of adenocarcinoma; the risk estimates for the risk genotype were much higher in non-Hispanic Whites than in Hispanics. In our study, this polymorphism was associated with squamous cell carcinoma. The different results in different populations may be because of genetic and environmental differences (23) .
Genetic susceptibility to lung cancer may depend on the level of exposure to tobacco smoke (24
, 25)
. Therefore, we examined further association between tobacco smoke exposure and the distribution of XRCC1 genotypes. When the subjects dichotomized by cigarette consumption into two pack-year groups (
40 pack-years and >40 pack-years), the Gln allele was associated with an increased risk for squamous cell carcinoma only in the group of low level of exposure. This might be explained by the fact that at high levels of exposure, the DNA repair capacity may be saturated even in individuals having higher repair capacity (24, 25, 26)
. It is possible that such a finding is attributable to chance because of the relatively small numbers in the subgroups. Additional studies with more patients will be needed to confirm this finding.
This study implicates that BER, including XRCC1, may be the major pathway for removing the mutagenic DNA damages arising from procarcinogens in cigarette smoke. Although it is difficult to attribute the carcinogenicity of tobacco to any particular compound, most important causative agents for squamous cell carcinoma are PAHs, such as benzo[a]pyrene (27 , 28) . PAH-induced bulky DNA adducts, such as benzo[a]pyrene diol epoxide-DNA adducts, which are the most potent premutagenic adducts, are mainly repaired by NER (28 , 29) . However, the metabolic activation pathway resulting in the formation of a diol epoxide ultimate carcinogen is a quantitatively minor one (30 , 31) . A variety of reactive oxygen species, such as hydroxyl radical and hydrogen peroxide, are generated during enzymatic oxidation of PAHs (32 , 33) . These reactive oxygen species can lead to DNA damages, which may be quantitatively a predominant PAH-induced DNA damage. Oxidative DNA damages are primarily removed via BER, including XRCC1. Moreover, BER also targets depurinating DNA adducts, such as N7-methylguanine and N3-methyladenine, derived from radical cations formed by one-electron oxidation of PAHs (34) . Another explanation for the association between squamous cell carcinomas and XRCC1 polymorphism may be that interactions with other procarcinogens induced DNA damage (35 , 36) . This is especially likely for exposure to cigarette smoke, where there are many potent procarcinogens producing various DNA damages.
In conclusion, we found that the codon 399Gln allele of XRCC1 gene was associated with an increased risk of squamous cell carcinoma of the lung in smokers, especially when the cigarette dose is low. These results suggest that genotyping analysis of XRCC1 gene could be used to identify individuals susceptible to lung cancer in smokers.
| Footnotes |
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1 Supported in part by the KOSEF through the Biomolecular Engineering Center at Kyungpook National University. ![]()
2 To whom requests for reprints should be addressed, at Department of Internal Medicine, School of Medicine, Kyungpook National University, Samduk 2Ga 50, Taegu, 700-412, Korea. Phone: 82-53-420-5536; Fax: 82-53-426-2046; E-mail: jaeyong{at}kyungpook.ac.kr ![]()
3 The abbreviations used are: BER, base excision repair; NER, nucleotide excision repair; XRCC1, X-ray repair cross-complementing group 1; OR, odds ratio; CI, confidence interval; PAH, polyaromatic hydrocarbon. ![]()
Received 5/18/01; revised 10/18/01; accepted 11/12/01.
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