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To investigate the correlation between the DNA damage level of the CYTB gene and the arsenic methylation level, FEN1 and XPC gene polymorphism in workers exposed to arsenic.
A total of 79 workers exposed to occupational arsenic in a coke oven factory in the southern mountainous area of Yunnan Province were selected as the exposure group, and 24 agricultural workers from the same village were selected as the control group. The urine and peripheral blood samples of the subjects were collected.The concentration and percentage of arsenic and its metabolites were detected in the urine, and the DNA damage level of the CYTB gene was detected in peripheral blood.
The concentrations of inorganic arsenic (iAs), monomethylarsonic acid (MMA), and dimethylarsonic acid (DMA) in the urine of the exposure group were higher than those of the control group (P<0.01). The methylation level of the exposure group was significantly higher than that of the control group in terms of MMA% and primary methylation index (PMI), while the DMA% and secondary methylation index (SMI) were significantly lower than those of the control group (P<0.01). Linear regression analysis showed that the DNA damage level of the CYTB gene was positively correlated with MMA% (P< 0.01) and negatively correlated with SMI (P<0.001). The subjects with genotypes AA or GA+AA at the rs174538 locus of the FEN1 gene had significantly higher DNA damage levels of the CYTB gene than those with genotypes GG at this locus (P< 0.05). However, there was no statistical correlation between the genotype of XPC and the level of DNA damage in the CYTB gene (P>0.05).
Occupational arsenic exposure can lead to increased concentrations of arsenic and its metabolites in urine and decreased methylation of arsenic metabolism in the body. The DNA damage of the CYTB gene can be used as a marker of damage and early health damage in the body, and the mutation at the rs174538 locus of the FEN1 gene is associated with DNA damage of the CYTB gene, which can be used as an indicator of disease susceptibility in arsenic-exposed populations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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