Genotype dependence of cytogenetic and epidemiological characteristics in the liquidators of the accident at the ChNPP

• Published in: Radiat͡s︡ionnai͡a︡ biologii͡a︡, radioėkologii͡a Vol. 48; no. 3; p. 303
• Main Authors: Sal'nikova, L E, Fomin, D K, Elisova, T V, Akaeva, E A, Kuz'mina, N S, Lapteva, N Sh, Nilova, I N, Iofa, E L, Kostina, L N, Kuznetsova, G I, Kulikova, T A, Panushkina, O G, Rubanovich, A V
• Format: Journal Article
• Language: Russian
• Published: Russia (Federation) 01.05.2008
• Subjects: Alleles; Chernobyl Nuclear Accident; Chromosome Aberrations; Female; Gene Frequency; Genotype; Glutathione S-Transferase pi - genetics; Glutathione Transferase - genetics; Homozygote; Humans; Male; Methylenetetrahydrofolate Reductase (NADPH2) - genetics; Middle Aged; Occupational Exposure - adverse effects; Point Mutation; Polymorphism, Genetic; Pulmonary Disease, Chronic Obstructive - epidemiology; Pulmonary Disease, Chronic Obstructive - etiology; Pulmonary Disease, Chronic Obstructive - genetics; Radiation Injuries - complications; Radiation Injuries - genetics; Radiation Tolerance - genetics; Radioactive Hazard Release; Sequence Deletion; Thyroid Neoplasms - epidemiology; Thyroid Neoplasms - etiology; Thyroid Neoplasms - genetics; Vascular Diseases - epidemiology; Vascular Diseases - etiology; Vascular Diseases - genetics
• ISSN: 0869-8031

The dependence of the level of unstable chromosome aberrations and nononcological diseases on the genotype in 57 liquidators of the ChNPP accident was studied. Candidate genes presumably affecting radiosensitivity were highly polymorphic loci of xenobiotic detoxication genes (glutathione-S-transferases GSTM1, GSTT1, GSTP1) and the 5,10-methylenetetrahydrofolate reductase gene (MTHFR) involved in DNA methylation and synthesis. An increased frequency (0.014 +/- 0.001 per cell) of unstable chromosome aberrations, including radiation-specific dicentrics and centric rings (0.0015 +/- 0.0002 per cell), has been found to be preserved in the group of liquidators examined in 2006-2007. No associations of polymorphism for each of the studied genes with cytogenetic parameters were revealed. Increased frequencies of chromosome aberrations were recorded in homozygous carriers of a deletion at the GSTM1 locus in combination with homozygosity for minor alleles at the MTHFR and GSTP1 loci (p = 0.00002 and p = 0.0233, respectively). The number of homozygous carriers of the minor allele GSTP1 was increased among patients with chronic obstructive pulmonary disease and in liquidators with acute circulation disturbances (p = 0.014 and p = 0.04, respectively). Double homozygotes for GSTM1 and GSTT1 deletions were significantly more frequent among subjects with benign tumors (cysts, polyps, p = 0.015) and with benign thyroid tumors (p = 0.017). This genotype has proved to be protective for patients with severe cardiovascular diseases (acute circulation disturbances, p = 0.027).