Rejoining between 9q+ and Philadelphia chromosomes results in normal-looking chromosomes 9 and 22 in Ph1-negative chronic myelocytic leukemia |
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Authors: | Johji Inazawa Hikari Nishigaki Hiroyuki Takahira Junji Nishimura Shigeo Horiike Masafumi Taniwaki Shinichi Misawa Tatsuo Abe |
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Institution: | (1) Department of Hygiene, Kyoto Prefectural University of Medicine, Kamigyo-ku, 602 Kyoto, Japan;(2) Department of Medicine, Kyoto Prefectural University of Medicine, Kamigyo-ku, 602 Kyoto, Japan;(3) Phird Department of Medicine, Faculty of Medicine, Kyushu University, Higashi-ku, Maidashi 3-1-1, 813 Fukuoka, Japan |
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Abstract: | Summary Rearrangement of the breakpoint cluster region (bcr) and the chromosomal location of c-abl and 3 -bcr were studied in two patients with Philadelphia chromosome (Ph1)-negative chronic myelocytic leukemia (CML). One patient (patient 1) had a normal karyotype and the other (patient 2), 46,XY,inv(3)(q21q26). Both patients showed the bcr rearrangement by Southern blot analysis with a 1.2 kb 3 -bcr probe. In situ hybridization studies demonstrated the location of the homologous sequences of bcr on chromosome 22 in patient 1, and on chromosomes 9 and 22 in patient 2. These findings indicate that the morphologically normal-looking chromosomes 9 and 22 in patient 2 are the result of a retranslocation between chromosomes 9q+ and 22q-, abnormalities which were first formed by a standard Ph1 translocation. |
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