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Abstract
Alpha-particle-induced chromosomal instability in haemopoietic cells obtained from the CBA/H, DBA/2 and C57BL/6 inbred strains of mouse has been demonstrated at frequencies dependent on genotype. The CBA/H and DBA/2 strains may be regarded as 'sensitive' and the C57BL/6 strain as 'resistant'; resistance was dominant in cells from F1 hybrids. Previously, in cultures where we demonstrated radiation-induced chromosomal instability we also demonstrated an enhanced and persisting oxyradical activity. Quantitative differences in superoxide generation have now been correlated with genetically determined differences in the expression of chromosomal instability. Our findings demonstrate an important influence of genetic factors in alpha -particle-induced chromosomal instability.