title: Jumping translocations in hematological malignancies: a cytogenetic study of five cases.
abstract: Jumping translocations (JT) are rare cytogenetic aberrations in hematological malignancies that include unbalanced translocations involving a donor chromosome arm or chromosome segment that has fused to two or more different recipient chromosomes in different cell lines. We report five cases associated with different hematologic disorders and JT to contribute to the investigation of the origin, pathogenesis, and clinical significance of JT. These cases involve JT of 1q in a case of acute myeloblastic leukemia (AML)-M1, a case of Burkitt lymphoma, and a case of BCR/ABL-positive acute lymphoblastic leukemia, as well as a JT of 13q in a case of AML-M5, and a JT of 11q segment in a case of undifferentiated leukemia. To our knowledge, with regard to hematologic malignancies, this study presents the first case of JT associated with AML-M1, the first case of JT involving 13q as a donor chromosome, and the first report of JT involving a segment of 11q containing two copies of the MLL gene, jumping on to two recipient chromosomes in each cell line and resulting in six copies of the MLL gene. Our investigation suggests that JT may not contribute to the pathogenesis but rather to the progression of the disease, and it demonstrates that chromosome band 1q10 as a breakpoint of the donor chromosome 1q is also implicated in AML, not only in multiple myeloma as it has been known until now.
authors.affiliation: Laboratory of Cytogenetics, NCSR "Demokritos" Athens, Greece. pmanola@ipta.demokritos.gr
authors.forename: Kalliopi N
authors.initials: KN
authors.lastname: Manola
authors.forename: Vasileios N
authors.initials: VN
authors.lastname: Georgakakos
authors.forename: Chryssa
authors.initials: C
authors.lastname: Stavropoulou
authors.forename: Alexandros
authors.initials: A
authors.lastname: Spyridonidis
authors.forename: Maria K
authors.initials: MK
authors.lastname: Angelopoulou
authors.forename: Ioanna
authors.initials: I
authors.lastname: Vlachadami
authors.forename: Andreas
authors.initials: A
authors.lastname: Katsigiannis
authors.forename: Paraskevi
authors.initials: P
authors.lastname: Roussou
authors.forename: Gabriel E
authors.initials: GE
authors.lastname: Pantelias
authors.forename: Constantina
authors.initials: C
authors.lastname: Sambani
mesh_terms: D000328:Adult; D000368:Aged; D002051:Burkitt Lymphoma / Q000175:diagnosis / Q000235:genetics; D020732:Cytogenetic Analysis; D005260:Female; D019337:Hematologic Neoplasms / Q000235:genetics*; D006801:Humans; D007621:Karyotyping; D007938:Leukemia / Q000175:diagnosis / Q000235:genetics; D007948:Leukemia, Monocytic, Acute / Q000175:diagnosis / Q000235:genetics; D015470:Leukemia, Myeloid, Acute / Q000175:diagnosis / Q000235:genetics; D008297:Male; D008875:Middle Aged; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000175:diagnosis / Q000235:genetics; D014178:Translocation, Genetic; D055815:Young Adult