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• W2111336486 abstract "In order to study the initial frequencies and define kinetics of the formation of chromosomal exchanges in X-irradiated human lymphocytes, the premature chromosome condensation (PCC) technique was employed in combination with fluorescence in situ hybridization (FISH) with a composite probe for human chromosome 8 and a pan-centromeric probe for the whole genome. Human lymphocytes were X-irradiated (0.5, 1, 2, 3, 4 and 6 Gy), fused with mitotic Chinese hamster ovary (CHO) cells immediately or 1, 3, 6, 12 and 18 h after irradiation. Immediately after irradiation chromosomal breaks, dicentrics and translocations showed a linear dose-response. Unrejoined chromosome breaks were the most frequent types of aberrations (about 85%) observed. About 15% of total aberrations were chromosome exchanges of 65% of these were translocations and 35% were dicentrics. The chromosomal exchanges initially observed were mostly incomplete, with no complex exchanges at doses of 1 and 2 Gy, at higher doses (3–6 Gy) complex exchanges were observed and their frequencies increased with increasing post incubation time. Following different recovery times, repair kinetics of breaks for different doses of irradiation was studied. The shapes of the curves obtained for breaks as well as chromosome exchanges were linear-quadratic. The linear yield component, α, is formed entirely in the fast process that can be manifested in the early plateau, while component β developed slowly in the subsequent hours. The kinetics of breaks rejoining was exponential, almost 50% of breaks rejoined after 1 h and at 18 h about 20% of breaks remained. At low doses of 1 and 2 Gy most of the exchanges were formed immediately and at higher doses, the frequency of exchanges increased with kinetics similar to that observed for the rejoining of breaks. However, the kinetics was different for different doses of irradiation. The frequency of dicentrics increased at doses above 2 Gy following 3 h recovery time, but for the translocations effect was pronounced even at 1 h recovery time. The frequency of incomplete exchanges (i.e., terminal translocations) decreased with post irradiation time and at 18 h was 30–40% less than the frequency obtained immediately after irradiation. The increase in the total translocations as a function of time between irradiation and fusion was due to a rapid increase in complete exchanges (i.e., reciprocal translocations). The frequency of ring chromosomes immediately after irradiation, also increased linearly, however, it was 3–5 times lower than dicentrics and remained almost constant in number for different doses and at different post-irradiation times." @default.
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• W2111336486 date "1998-08-01" @default.
• W2111336486 modified "2023-10-17" @default.
• W2111336486 title "Kinetics of the formation of chromosome aberrations in X-irradiated human lymphocytes, using PCC and FISH" @default.
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• W2111336486 doi "https://doi.org/10.1016/s0027-5107(98)00095-5" @default.
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