Analysis of copy number aberrations in blood lymphocytes of nuclear industry workers exposed to external radiation

Abstract

Introduction. The search for biological markers of individual radiosensitivity remains an extremely urgent problem of modern medicine. Aim: to evaluate of the copy number aberrations in the blood lymphocytes of workers exposed to occupational radiation exposure. Methods. The object of the study was the blood of 20 relatively healthy workers of the Siberian Chemical Combine, exposed to external radiation. A standard cytogenetic analysis was performed for all the examined individuals. The blood DNA was examined using a «CytoScan HD Array» microarray («Affymetrix», USA). To process the results of microchipping, a program was used «Chromosome Analysis Suite 4.3» («Affymetrix», США). Results. For4 workers found out 4 CNA: 3 mosaic amplifications, 1 mosaic deletion. Conclusion. The detected 4 candidates for the origin of de novo CNA were not induced by chronic low-intensity radiation, as they did not show an association with radiation. In this study, the assumption about the connection of de novo CNA with the radiosensitivity of individuals was not confirmed. Further studies of the mechanisms of XA preservation are needed in order to detect markers of individual radiosensitivity.