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Introduction. According to genetic factors, it is possible to determine the degree of manifestation of the toxic effects of mercury. The latter justifies the assessment of the genetic status of the exposed contingent in order to identify hypersensitive individuals in whom adverse health effects can be realized when exposed to relatively low levels of the toxicant. The study aims to research the distribution of genotypes of some polymorphic variants of genes of the xenobiotic biotransformation system, heat shock proteins and tumor necrosis factor in the contingent involved in liquidation measures, as well as to identify individuals with a high prognostic risk of toxic effects due to exposure to mercury. Materials and methods. We conducted genotyping of 231 people (men only): 193 employees of the Ministry of Emergency Situations (MES) of Russia in the Irkutsk Region and 38 employees of the Federal Environmental Operator (FEO) involved in the elimination of mercury pollution at the industrial site of the mercury electrolysis plant and adjacent facilities on the territory of a former chemical plant in Eastern Siberia. The researchers used real-time PCR and PCR-RFLP methods to study polymorphic variants of the genes CYP1A1 (rs1048943), GSTP1 (rs1695 and rs1138272), TNF-α (rs1800629) and HSPA1B (rs1061581). Results. For the polymorphism of the GSTP1 gene (rs1695), we have identified an increase in the frequency of AG genotypes (p=0.043) and a decrease in the frequency of GG genotypes (p=0.048) in employees of the MES compared to those from the FEO group. The researchers didn’t detect carriers of the TT genotype for the polymorphic locus GSTP1 (rs1138272) in both examined groups. There was the carriage of the rare GG-CYP1A1 homozygote only in one MES employee. We found that 33 MES employees and 3 examined from the FEO group who are carriers of the GG-HSPA1B (+1267A/G) genotype have a high predictive risk of developing toxic effects due to mercury exposure. The experts discussed the data obtained with the results of genotyping of former mercury electrolysis shop workers who were chronically exposed to metallic mercury vapor. The experts have reviewed the data obtained from the results of genotyping of former employees of the mercury electrolysis shop who were chronically exposed to metallic mercury vapor Limitations. The limitations, first of all, should include the number of examined individuals in the FEO group, as well as the lack of data on deletion polymorphisms of the GSTT1 and GSTM1 genes, potentially having a significant role in the toxicokinetics of mercury. Conclusion. The study has revealed 36 carriers of the GG genotype of the polymorphic locus +1267A/G of the HSPA1B gene associated with a high prognostic risk of toxic effects associated with exposure to mercury among the employees of the Ministry of Emergency Situations (MES) and the FEO involved in liquidation work. Taking into account the forthcoming volume and duration of work related to the demercurization of the territory of the former factory with mercury electrolysis technology and the surrounding area it is advisable to take into account the results obtained when monitoring the health status of the liquidators. Ethics. We have received voluntary informed consent, approved by the Committee on Biomedical Ethics (Protocol No. 6 of 10.03.2020), from each employee being examined.
Introduction. According to genetic factors, it is possible to determine the degree of manifestation of the toxic effects of mercury. The latter justifies the assessment of the genetic status of the exposed contingent in order to identify hypersensitive individuals in whom adverse health effects can be realized when exposed to relatively low levels of the toxicant. The study aims to research the distribution of genotypes of some polymorphic variants of genes of the xenobiotic biotransformation system, heat shock proteins and tumor necrosis factor in the contingent involved in liquidation measures, as well as to identify individuals with a high prognostic risk of toxic effects due to exposure to mercury. Materials and methods. We conducted genotyping of 231 people (men only): 193 employees of the Ministry of Emergency Situations (MES) of Russia in the Irkutsk Region and 38 employees of the Federal Environmental Operator (FEO) involved in the elimination of mercury pollution at the industrial site of the mercury electrolysis plant and adjacent facilities on the territory of a former chemical plant in Eastern Siberia. The researchers used real-time PCR and PCR-RFLP methods to study polymorphic variants of the genes CYP1A1 (rs1048943), GSTP1 (rs1695 and rs1138272), TNF-α (rs1800629) and HSPA1B (rs1061581). Results. For the polymorphism of the GSTP1 gene (rs1695), we have identified an increase in the frequency of AG genotypes (p=0.043) and a decrease in the frequency of GG genotypes (p=0.048) in employees of the MES compared to those from the FEO group. The researchers didn’t detect carriers of the TT genotype for the polymorphic locus GSTP1 (rs1138272) in both examined groups. There was the carriage of the rare GG-CYP1A1 homozygote only in one MES employee. We found that 33 MES employees and 3 examined from the FEO group who are carriers of the GG-HSPA1B (+1267A/G) genotype have a high predictive risk of developing toxic effects due to mercury exposure. The experts discussed the data obtained with the results of genotyping of former mercury electrolysis shop workers who were chronically exposed to metallic mercury vapor. The experts have reviewed the data obtained from the results of genotyping of former employees of the mercury electrolysis shop who were chronically exposed to metallic mercury vapor Limitations. The limitations, first of all, should include the number of examined individuals in the FEO group, as well as the lack of data on deletion polymorphisms of the GSTT1 and GSTM1 genes, potentially having a significant role in the toxicokinetics of mercury. Conclusion. The study has revealed 36 carriers of the GG genotype of the polymorphic locus +1267A/G of the HSPA1B gene associated with a high prognostic risk of toxic effects associated with exposure to mercury among the employees of the Ministry of Emergency Situations (MES) and the FEO involved in liquidation work. Taking into account the forthcoming volume and duration of work related to the demercurization of the territory of the former factory with mercury electrolysis technology and the surrounding area it is advisable to take into account the results obtained when monitoring the health status of the liquidators. Ethics. We have received voluntary informed consent, approved by the Committee on Biomedical Ethics (Protocol No. 6 of 10.03.2020), from each employee being examined.
Introduction. Elimination of the consequences of emergency situations (ES) involves increased physical and psychological stress, as well as the direct aggressive impact of chemical and physical factors. Currently, the problem of environmental hazard is environmental pollution from the activities of «Usolyekhimprom», where on an area of 610 hectares there are tens of thousands of tons of harmful substances, including metallic mercury. On the territory of this enterprise, employees of the Federal Environmental Operator and the Ministry of Emergency Situations are currently engaged in eliminating environmental pollution. Over the past two years, a number of measures have been taken at the industrial site of «Usoliekhimprom» to dismantle buildings and demercurize. For 2023–2024 reconstruction, dismantling and disposal of the destroyed buildings of the enterprise are planned, in this regard, the liquidators may be affected by an even wider range of adverse factors. Employees of the East-Siberian Institute of Medical and Ecological Research conduct dynamic monitoring of the liquidators. The purpose of the study was to evaluate the neurophysiological and psychological indicators in liquidators in eliminating environmental pollution associated with the production of chemical products to prevent the occurrence of occupational pathology. Materials and methods. Forty males were examined. Electroneuromyographic examination (ENMG) was performed with testing of the sensory and motor components of the nerves of the upper extremities, electroencephalography (EEG), and psychological testing. Results. According to data of obtained ENMG parameters in the group of liquidators, a subthreshold decrease in the speed of impulse conduction in the area of the elbow joint was established during stimulation of the motor and sensory components of the ulnar nerve (up to 50 m/s). Analysis of interhemispheric coherence in the α-range in the group of liquidators revealed an increase in coherence in the right temporal leads (0.6 (0.4–0.7) G) compared with the standard values (0.35 (0.3–0.4) D) and weakening of coherent connections in the left frontal leads (0.35 (0.17–0.4) D). Changes in the mnestic sphere and the quality of life of the subjects were not revealed. Limitations. The limitation of the study was the lack of data on testing the motor and sensory components of the lower extremities during an electroneuromyographic examination and the lack of registration of evoked potentials during electroencephalography. Conclusion. The changes detected by ENMG indicate the manifestations of polyneuropathy at the preclinical stage. The analysis of interhemispheric coherence in the α-band revealed an increase in coherence in the right temporal leads and a weakening of coherent connections in the left frontal leads. The results of the medical and psychological study did not reveal any changes on the part of the mnestic sphere and the quality of life in the group of liquidators.
Introduction. The prevalence of arterial hypertension and dyslipidemia in the Russian population exceeds 50%. By a number of working industrial factors have been proved to play the negative role in their development. The results of earlier studies indicate to the epigenetic role of toxic substances in relation to various genes. The aim of the study was to establish associations of polymorphic variants of cardiovascular risk genes with disorders of lipid metabolism in workers performing liquidation works in the accumulated environmental risks zone. Materials and methods. Ninety two and 82 employees from Federal Environmental Operator (FEO) and EMERCOM, respectively were studied. Parameters of lipid metabolism and polymorphic variants of APOE Cys130Arg (rs429358) and PPARG Pro12Ala (rs1801282) genes were investigated. Results. In FEO workers, each variant allele of the APOE Cys130Arg gene is associated with impaired LDL-C concentration in an additive manner (OR = 2.69; 95% CI = 1.03–7.08, p=0.04). Carrying either the T/C or C/C variant allele of this polymorphic variant or the C/G or G/G polymorphic variant Pro12Ala of the PPARG gene increases the odds of developing abnormalities in total cholesterol levels by more than 3.5-times. The risk influence of the mutant genotype G/G and allele G on the increase of Apo B concentration was also established. In EMERCOM workers, the presence of both alleles of this polymorphic variant increased the probability of a decrease in HDL-H levels by 5 times. Limitations. Male persons are employees of the FEO and the Ministry of Emergency Situations. Age accounts of 30–50 years. Conclusions. An increased risk of deviations of total cholesterol concentration, proatherogenic cholesterol, and lipoprotein fractions associated with the PPARG Pro12Ala and APOE Cys130Arg genes polymorphisms was found in FEO workers, whereas only the reduced high-density lipoprotein cholesterol risk in carriers of the PPARG Pro12Ala gene mutant allele was found in EMERCOM workers.
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