Association between genetic polymorphisms of DNA repair genes XRCC1, XRCC3 and susceptibility to chronic benzene poisoning / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To explore the association between genetic polymorphisms of DNA repair genes XRCC1, XRCC3 and susceptibility to chronic benzene poisoning.</p><p><b>METHODS</b>A case-control study was conducted. Eighty patients with chronic benzene poisoning and 62 workers occupationally exposed to benzene who were engaged in the same working time and job title as patients were investigated. Polymerase chain reaction-restriction fragments length polymorphism (PCR-RFLP) was used to detect the single nucleotide polymorphisms on C26304T, G27466A, G28152A, G36189A of XRCC1 and C18067T of XRCC3. The relationship between them and latency of chronic benzene poisoning was analyzed by Kaplan-Meier method.</p><p><b>RESULTS</b>A correlation for XRCC3 18067C/T compared with C/C genotype was found (OR=0.233, 95% CI 0.085 approximately 0.639, P=0.0046). Patients who were XRCC1 27466G/G homozygous wild genotype developed chronic benzene poisoning average 6 years later than those had homozygous (27466A/A) or heterozygous (27466G/A) mutant alleles.</p><p><b>CONCLUSION</b>Subjects with XRCC3 18067T variant allele are tolerance sub-group to benzene poisoning. Patients carrying XRCC1 27466 G/G genotype develop chronic benzene poisoning later.</p>

Analysis for the association between genetic polymorphisms of XRCC1, XPD, XRCC3, CCND1 and the latency of the occupational chronic benzene poisoning / 中华预防医学杂志

<p><b>OBJECTIVE</b>To explore the association between genetic polymorphisms of XRCC1, XPD, XRCC3 and CCND1 and latency of occupational chronic benzene poisoning.</p><p><b>METHODS</b>80 patients diagnosed with occupational chronic benzene poisoning were investigated. PCR-RFLP was applied to detect the single nucleotide polymorphisms of C26304T, G27466A, G28152A, G36189A of XRCC1, C22541A, C23591T, A35931C of XPD, C18067T of XRCC3 and G870A of CCND1. Their relationship with the latency of chronic benzene poisoning was analyzed by Kaplan-Meier method.</p><p><b>RESULTS</b>The association of XRCC1 G27466A subgroup with the latency of chronic benzene poisoning was observed, as well as that of CCDN1G870A subgroup. The benzene-exposed workers with XRCC1 27466G/G homozygous wild genotype developed chronic benzene poisoning 6.9 years later than those had homozygous (27466A/A) or heterozygous (27466G/A) mutant alleles. On the other hand, the latency developing chronic benzene poisoning was longer in workers with homozygous (CCND1 870A/A) or heterozygous (CCND1 870G/A) mutant alleles than in those carrying 870G/G homozygous wild genotype (14.9 vs. 8.7 years).</p><p><b>CONCLUSION</b>The polymorphisms of XRCC1 and CCND1 potentially modify the latency of the chronic benzene poisoning among workers exposed to benzene.</p>

Association between polymorphisms of XPD gene and susceptibility to chronic benzene poisoning / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To explore the relationship between genetic polymorphisms of XPD gene and susceptibility to chronic benzene poisoning.</p><p><b>METHODS</b>A case control study was conducted. Eighty patients diagnosed with chronic benzene poisoning and 62 workers occupationally exposed to benzene who were engaged in the same working time and job title as patients were investigated. PCR-RFLP was used for detecting the single nucleotide polymorphisms (SNPs) on codon156, codon312 and codon751 of XPD gene.</p><p><b>RESULTS</b>There was a 2.903 times (95% CI: 1.054 - 7.959, P = 0.039 2) increased risk of chronic benzene poisoning in the subjects carrying XPD 751Gln variant allele compared with those carrying XPD 751Lys/Lys genotype, after adjusted for sex, length of service, smoking and drinking status.</p><p><b>CONCLUSION</b>The subjects with XPD 751Gln variant allele are more susceptive to benzene.</p>