Due to the prevalence of microelementosis (including iodine and iron deficiencies), cytogenetic abnormalities in children with microelement imbalance were studied. The objective of the research was to assess the abnormalities in the immunogenetic status of the organism by the frequency and spectrum of chromosomal aberrations, associations of acrocentric chromosomes and to determine the frequency of micronuclei in peripheral blood leukocytes in children with mild iodine deficiency, latent iron deficiency and their combination. There were examined 68 boys and 65 girls at the age of 6 to 18 years. In the analysis of indicators the main attention was paid to the age- (6 - 11 and 12 - 18 years) and gender-related peculiarities. In all the children, associations of acrocentric chromosomes of two chromosomes were most commonly observed: in the control group, this indicator was 73,74 %; in iodine deficiency, it was 67,72 %; in iron deficiency, it was 67,68 %; in combined microelementosis, the indictor was 68,68 %. Chromosomal abnormalities were recorded in 56,03 % of children. However, in the control group, this indicator was 40,94 %, while in microelement imbalance, it was 71,13 %. The most significant changes in the spectrum of chromosomal aberrations were identified in iodine and iron deficiencies (increase in the frequency of paired fragments, dicentrics, translocations, and the presence of a ring chromosome). Conclusions: changes in the frequency and characteristics of the number of chromosomes in associations of acrocentric chromosomes, the frequency and spectrum of chromosomal aberrations, and the number of micronuclei indicated genotype instability, especially in iodine deficiency and combined microelement imbalance.

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