Influence of MDR1 gene C3435T on peripheral white blood cell counts in workers exposed to benzene / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To explore the effects of MDR1 C3435T on the peripheral white blood cell counts in workers exposed to benzene.</p><p><b>METHODS</b>One hundred and twenty-one benzene-exposed workers and 110 healthy controls without benzene exposure were enrolled in this study. White blood cell counts influenced by the polymorphism of MDR1 gene were analyzed.</p><p><b>RESULTS</b>The frequency of MDR1 3435 C/C, C/T, T/T in healthy controls was 37.27%, 46.36%, 16.37%, respectively, and it was 38.84%, 41.33%, 19.83% in the benzene-exposed workers, respectively. The frequency of the MDR1 gene was also not significantly different between benzene exposed workers and controls. Subjects exposed to benzene with MDR1 3435 mutation genotype (T/T) had the significantly lower WBC [(5.46 ± 1.51) × 10(9)/L] than those carrying wild type (C/C) and heterozygous (C/T), whose WBC were (6.08 ± 1.28) × 10(9)/L (P = 0.044).</p><p><b>CONCLUSION</b>P-glycoprotein encoded by MDR1 gene may be implicated into the hematotoxicity of benzene. Subjects carrying MDR1 3435 T/T genotype may have a higher risk of benzene poisoning.</p>

High-resolution melting: a analysis for genotyping of MDR1 C3435T in benzene-exposed workers / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>Using high resolution melting (HRM) to analysis MDR1 C3435T in people exposed to benzene.</p><p><b>METHODS</b>Restriction fragment length polymorphism (RFLP) was utilized to detect the polymorphism of MDR1 3435 in 121 benzene-exposed workers, and the results were compared with the HRM in 10% samples and were confirmed with direct sequencing for six people in them.</p><p><b>RESULTS</b>By direct sequencing, consistent results of benzene-exposed workers with RFLP or HRM were got. The new high resolution melting curve analysis is more efficient, more convenient, and cheaper than RFLP.</p><p><b>CONCLUSION</b>High-resolution melting analysis provides a valid approach to efficiently detect DNA genetic diagnosis, which is suitable for detect susceptible genes in occupational surveillance.</p>

Molecular analysis of a SNP in SCL2A9 and uric acid levels in Chinese male gout patients / 中华风湿病学杂志

ObjectiveSLC2A9 is a novel identified urate transporter that affects serum uric acid levels. The present study is aimed to investigate rs7442295 polymorphism in intron 6 of SLC2A9 in a population of Chinese male gout or hypemricaemia subjects. MethodsA total of 268 gout patients and 288 healthy male volunteers were included. Blood pressure, body mass index(BMI), serum uric acid, glucose, lipid,urea and creatine were detected. DNA was purified from peripheral blood and the rs7442295 polymorphism was evaluated using high resolution melting ( HRM ) analysis and direct sequencing. Data were analyzed with t test or chi-square test. Results A/A and A/G genotypes were unambiguously distinguished with HRM technology. The occurrence of the homozygous type (G/G) was completely absent among the study population.The prevalence of the A/A and A/G genotype was 96.2％ and 3.8％ respectively. However, no significant differences of genotype frequencies were found in gout patients and normal subjects(x2=0.003, P=0.82; x2=0.003, P=1.00). But the serum uric acid levels in individuals with the A/G genotype[(293±100) μmol/L]were significantly lower than those with the A/A genotype[(392±133) μmol/L](t=2.426, P＜0.01 ). The A/G genotype frequency was significantly higher in the low-uric acid group than in the high uric-acid group (x2=6.279, P=0.01 ). Genotyping based on HRM was fully concordant with sequencing. Conclusion The polymorphism rs7442295 in SLC2A9 may be a genetic marker to assess risk of hyperuricemia among Chinese male Hart population. HRM is a simple, fast, reliable and close-tube technology for genotyping.