Cultures of blood from healthy adults were irradiated 48 h after stimulation with 240 R of X-rays and fixed after various time intervals (0-2 h, 2-4 h, 4-6 h). 3HTdR was added to several cultures after irradiation. Mitotic and labelling indices were used to distinguish between two cell samples inside the irradiated G2 population: D - cells reaching mitosis without mitotic delay and a high frequency of chromatic breaks and D + cells with mitotic delay and which, during the delay, repair most of the damage produced. After R banding 450 chromatid deletions were located in each of the two cell samples. The D + cells showed a higher frequency of breaks than the D - cells with decreasing chromosome size, in the telomeric and centromeric region and in the junction between the R + and R - bands. These results can be interpreted as indicative of a non-random distribution of repair processes both between and within chromosomes. © 1985.
Inter- and intra-chromosomal distribution of chromatid breaks induced by X-rays during G2 in human lymphocytes / Pelliccia, Franca; Micheli, Aldo; Olivieri, Gregorio. - In: MUTATION RESEARCH. - ISSN 0027-5107. - STAMPA. - 150:1-2(1985), pp. 293-298. [10.1016/0027-5107(85)90125-3]
Inter- and intra-chromosomal distribution of chromatid breaks induced by X-rays during G2 in human lymphocytes
PELLICCIA, Franca;MICHELI, Aldo;OLIVIERI, Gregorio
1985
Abstract
Cultures of blood from healthy adults were irradiated 48 h after stimulation with 240 R of X-rays and fixed after various time intervals (0-2 h, 2-4 h, 4-6 h). 3HTdR was added to several cultures after irradiation. Mitotic and labelling indices were used to distinguish between two cell samples inside the irradiated G2 population: D - cells reaching mitosis without mitotic delay and a high frequency of chromatic breaks and D + cells with mitotic delay and which, during the delay, repair most of the damage produced. After R banding 450 chromatid deletions were located in each of the two cell samples. The D + cells showed a higher frequency of breaks than the D - cells with decreasing chromosome size, in the telomeric and centromeric region and in the junction between the R + and R - bands. These results can be interpreted as indicative of a non-random distribution of repair processes both between and within chromosomes. © 1985.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.