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Objective: to determine the distribution of genotypes of genetic polymorphism of manganese superoxide dismutaseand to assess the ventilation lung capacity in children- residents of radioactively contaminated areas and childrenexposed to stressful life events during the war period., Materials and Methods: The study involved school-age children - residents of radioactively contaminated areas(RCA) and children exposed to stressful life events during wartime. All those examined had no clinical signs of respiratory pathology. Genotypes for the SOD2 Val16Ala genetic variant were determined using the polymerase chainreaction (PCR) method. The study of the ventilation lung capacity was assessed by the method of computer spirometry based on the flow-volume loop analysis data., Results and Conclusions: When studying the genotypes and alleles of the polymorphic marker SuperoxideDismutase 2 Gene Val16Alain children of group I and II, no significant differences were found between the frequencydistribution indicators of genotypes and alleles compared with the reference values of the those of the controlgroup, which consisted of practically healthy residents of the Middle East. Also, no significant differences in the frequency distribution of the C and T alleles of the polymorphic marker Superoxide Dismutase 2 Gene Val16Ala werefound in the children of both examined groups compared to other representatives of the Caucasian race (Lithuanians, Finns, Germans). Among children in groups I and II, there was a tendency toward a decrease in the frequency of occurrence of homozygotes with the CC genotype and an increase in the frequency of occurrence of heterozygotes with the CT genotype. Among children of both examined groups, in heterozygotes with the CT genotype of theSuperoxide Dismutase 2 Gene Val16Ala polymorphism, a tendency towards an increase in the frequency of bronchialhyperreactivity was observed compared to CC homozygotes. Analysis of the variant allele frequency distribution ofSOD2 Val16Ala polymorphism in children of both examined groups determined that in the presence of bronchial hyperreactivity there was a tendency toward an increase in the prevalence of the T allele and a decrease in the prevalence of the C allele., (I. Ye. Kolpakov, V. М. Zigalo, V. H. Kondrashova, V. A. Poznysh, L. O. Leonovych.)

Objective: to determine the association of catalase С-262Т gene polymorphism with the presence of bronchial hyper-reactivity in children living in radioactively contaminated territories. Materials and methods. There were examined school-age children-residents of radioactively contaminated territories (RCT), who did not have clinical signs of respiratory pathology. Catalase (CAT) С-262Т gene deletion polymorphism was studied in the molecular genetic laboratory of the State Institution «Reference Center for Molecular Diagnostic of Public Health Ministry of Ukraine». Determination of the polymorphic variant by the catalase С-262Т gene was performed by Polymerase Chain Reaction (PCR) using specific oligonucleotide primers, followed by Restriction Fragment Length Polymorphism (RFLP) analysis. The CAT С-262Т gene polymorphism in children living in RCT was compared with that in the reference group of practically healthy individuals. Ventilation lung capacity was performed by computer spirometry according to the analysis of the loop «the flow-volume». A pharmacological inhalation test with a bronchodilator that acts on β2-adrenergic receptors of the lungs was used to detect early changes in the ventilatory capacity of the lungs - bronchial hyperreactivity. Results. Comparative analysis showed that in the presence of bronchial hyperreactivity in children living in RCT, the CT genotype was more common than in children without bronchial hyperreactivity, and the frequency of the CC genotype was correspondingly reduced. There was a trend towards a decrease in the frequency of the TT genotype. An analysis of the frequency distribution of allelic variants of the CAT С-262Т gene polymorphism in children living in the RCT revealed a tendency to increase in the frequency of the T-allele and according to the decrease in the frequency of C-allele in the presence of bronchial hyperreactivity. Сonclusions. Thus, among children living in RCT, CT-homozygotes of CAT С-262Т gene polymorphism had bronchial hyperreactivity probably more often than CC-heterozygotes. In the presence of bronchial hyperreactivity, there was a trend towards an increase in the frequency of the T-allele and, accordingly, a decrease in the frequency of the C-allele. [ABSTRACT FROM AUTHOR]

Objective: to determine the relationship between polymorphisms of glutathione S-transferase gene family andbronchial hyperreactivity in children living in radioactively contaminated areas., Materials and Methods: School age children-residents of radioactively contaminated areas (RCA), without clinicalsigns of respiratory pathology were examined. Molecular genetic studies were carried out by polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) for further analysis. The GSTT1, GSTM1 gene deletion polymorphism was investigated using multiplex PCR. PCR and PCR-RFLP analyses were performed in the studyof the GSTP1 gene A313G polymorphism. The ventilation lung capacity was examined by the pneumotachographicmethod according to the analysis of «the flow-volume» loop. The pharmacologic inhalation test with bronchodilator drug, affecting the β2-adrenergic lung receptors was used to detect the early changes in the ventilation lungcapacity - the bronchial hyperreactivity (latent and nonlatent bronchospasm)., Results: Molecular genetic studies showed that the GSTM1 gene deletion genotype and the GSTP1 gene A313G polymorphism were found significantly more often in the subgroup of children with bronchial hyperreactivity living inRCA than in children without bronchial hyperreactivity and children of the control group. The frequency of GSTT1deletion polymorphism did not have a statistically significant difference in all subgroups., Conclusions: The GSTM1 gene deletion polymorphism and the GSTP1 gene A313G genotype may be a risk factor fordeveloping bronchial hyperreactivity in children living under adverse environmental conditions, including radioactively contaminated areas., (Ye. I. Stepanova, I. Ye. Kolpakov, V. Yu. Vdovenko, V. М. Zigalo, V. H. Kondrashova, О. S. Leonovich.)