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© 1996 Oxford University Press

research-article

Chromosomal mechanisms in murine radiation acute myeloid leukaemogenesis

Simon D. Bouffler 1, George Breckon 2 and Roger Cox

Biomedical Effects Department, National Radiological Protection Board Chilton, Didcot, Oxon, 0X11 ORQ, UK

1To whom correspondence should be addressed

Chromosome 2 abnormalities, particularly interstitial deletions, characterize murine radiation-induced acute myeloid leukaemias (AMLs). Here, G-band analyses in CBA/H mice of early (1–6 month) post 3 Gy X-irradiation events in bone marrow cells in vivo and of karyotype evolution in one unusual AML are presented. The early event analysis showed that all irradiated animals carry chromosome 2 abnormalities, that chromosome 2 abnormalities are more frequent than expected and that interstitial deletions are more common in chromosome 2 than in the remainder of the genome. On presentation AML case N122 carried a t(2;11) terminal translocation which, with passaging, evolved into a del2(C3F3). Therefore two pathways in leukaemogenesis might exist, one deletion-driven, the other terminal translocation-driven involving interstitial genes and terminal genes respectively of chromosome 2. As all irradiated individuals carried chromosome 2 abnormalities, the formation of these aberrations does not determine individual leukaemogenic sensitivity as only 20–25% of animals would be expected to develop AML. Similar lines of argument suggest that chromosome 2 abnormalities are necessary but not sufficient for radiation leukaemogenesis in CBA/H nor are they rate limiting in leukaemogenesis.


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