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In order to study chromosome sensitivity of Bloom's syndrome (BS) cells in relation to the replication stage, gamma-ray irradiation was performed immediately before adding bromodeoxyuridine (BrdU) to lymphocyte cultures of one BS patient and of one control. It was found that BS cells are much more sensitive to the irradiation than control cells at the end of S and at G2 phases. The rate of induction of chromosome breaks is significantly increased and that of chromatid breaks and exchanges is also increased, though to a lesser degree. Our results also favor the existence of a cell subpopulation in BS characterized by a slow cycle, a high spontaneous chromosome aberration rate, and a high radiation sensitivity.
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