Evidence of a New Chimeric bcr/c-abl mRNA in Patients with Chronic Myelocytic Leukemia and the Philadelphia Chromosome

K Stam, N Heisterkamp, G Grosveld… - … England Journal of …, 1985 - Mass Medical Soc
K Stam, N Heisterkamp, G Grosveld, A de Klein, RS Verma, M Coleman, H Dosik, J Groffen
New England Journal of Medicine, 1985Mass Medical Soc
The hallmark of chronic myelocytic leukemia is the presence of the Philadelphia
chromosome (Ph1). In recent studies, we obtained data that strongly suggested the
involvement of an oncogene, c-abl, in this type of leukemia. This oncogene, normally located
on chromosome 9, is translocated to chromosome 22 as a result of the Ph1 translocation. In
addition, we identified a region on chromosome 22, the breakpoint cluster region (bcr),
which contains the chromosomal breakpoint in all patients with chronic myelocytic leukemia …
Abstract
The hallmark of chronic myelocytic leukemia is the presence of the Philadelphia chromosome (Ph1). In recent studies, we obtained data that strongly suggested the involvement of an oncogene, c-abl, in this type of leukemia. This oncogene, normally located on chromosome 9, is translocated to chromosome 22 as a result of the Ph1 translocation. In addition, we identified a region on chromosome 22, the breakpoint cluster region (bcr), which contains the chromosomal breakpoint in all patients with chronic myelocytic leukemia who are positive for Ph1. Recent studies have suggested that the bcr is part of a gene that is truncated as a consequence of the Ph1 translocation. The deleted part of this gene could be replaced by c-abl sequences; to test this hypothesis we analyzed the RNA of five patients with chronic myelocytic leukemia. All five had chimeric bcr/c-abl messenger RNA, suggesting that the deleterious effects of this disease can be associated with an abnormal chimeric protein encoded by the bcr and the c-abl oncogene. (N Engl J Med 1985; 313:1429–33.)
The New England Journal Of Medicine