Distribution of polymorphic variants of genes for xenobiotic biotransformation GSTM1, GSTT1 and GSTP1 in populations of native inhabitants and Russians of Eastern Siberia

Relevance. The study of the gene polymorphism of the system biotransformation of xenobiotics, which are associated with a number of multifactorial diseases, is an important area of modern medical genetic research. The aim and tasks are to reveal ethnic features in the distribution of polymorphic variants of genes GSTM1, GSTT1 and GSTP1 among Buryats, Teleuts and Russians of Eastern Siberia. Materials and methods. The samples of Eastern (N=139) and Western (N=284) Buryats, métis Western Buryats with Russians (N=47), Teleuts (N=115) and Russians of East Siberia (N=122) are studied. Detection of GSTM1 0/0 and GSTT1 0/0 was carried out through multiplex real-time PCR. Genotyping of GSTP1 was performed using TaqMan real-time PCR. Results. The occurrence of GSTM1 0/0 among Eastern and Western Buryats is 37.7% and 57.7% respectively (51.4% for the total sample of Buryats), among Russians - 42.6%. Significantly lower frequency is shown in Teleuts-17.4%. The frequency of GSTT1 0/0 in Eastern and Western Buryats is 40.8% and 27.6% respectively. It is significantly lower in Russians - 18%, in Teleuts - 24.8%. Mestis shows intermediate frequencies of GSTM1 0/0 and GSTТ1 0/0. GSTP1 1405G is found among Eastern and Western Buryats with 27.7% and 19.2% frequency, respectively, in Russians - 31.8%, Teleuts - 24.8%. The difference of Russians with Western Buryats is statistically significant. The frequencies of GSTP1 2285T among Eastern (4.9%), Western (1.8%) Buryats and Teleuts (2.2%) are lower than frequency among Russians (8.3%). The difference between Russians and Western Buryats with Teleuts is statistically significant. Summary. There are increased frequencies of GSTM1 0/0 and GSTT1 0/0 in the total cohort of Buryats in comparison with Teleuts and Russians. According to the literature data, these genotypes are associated with multi-factorial diseases. In both samples of Buryats, there is a statistically significantly increased frequency of the combined genotype resulting in the absence of enzyme activity. At the same time, there is a statistically significantly increased frequency of individuals with a genotypic combination GSTM1 +GSTT1 + responsible for normal enzymatic activity in the sample of Teleuts. There are reduced frequencies of risk-alleles GSTP1 1405G and 2285T among Buryats and Teleuts in comparison with Russians. Metisation changes the frequency of risk alleles. Significant differences in the frequencies of GSTM1, GSTT1 and GSTP1 within the Buryat ethnic group may indicate its genetic heterogeneity.

буряты, телеуты, русские Восточной Сибири, метисы, ПЦР в режиме реального времени, полиморфизм генов биотрансформации ксенобиотиков, GSTM1 0/0, GSTТ1 0/0, GSTP1 (A1405G, rs947894), GSTP1 (C2285T, rs1138272), Buryats, Teleuts, Russians of Eastern Siberia, Métis, real-time PCR, polymorphism of genes for xenobiotic biotransformation, GSTM1 0/0, GSTТ1 0/0, GSTP1 A1405G (rs947894), GSTP1 C2285T (rs1138272)

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