Southern Blot Analysis of ALL-1 Rearrangements at Chromosome 11q23 in Acute Leukemia

Francesco Lo Coco, Franco Mandelli, Massimo Breccia, Luciana Annino, Cesare Guglielmi, Maria C. Petti, Anna M. Testi, Giuliana Alimena, Carlo M. Croce, Eli Canaani

Research output: Contribution to journalArticlepeer-review


The chromosome 11q23 band is a genetic region frequently involved in nonrandom karyotypic abnormalities of acute leukemia. A genomic locus named ALL-1 or MLL, where 11q23 breakpoints are clustered, has been recently cloned and characterized. We have made use of an ALL-1 -specific probe in Southern blot experiments to analyze the configuration of this gene in a large series of acute leukemia patients, representative of all different myeloid and lymphoid subtypes.Nine of 145 cases (62%) showed abnormal ALL-1 restriction fragments in leukemic DNAs. Of these nine cases, five patients in whom karyotypic data were available displayed chromosome llq23 aberrations, including t(4;ll) (three cases) and t(9;ll) (two cases). Immunophenotypic and morphocytochemical characterization of ALL-l-rearranged acute leukemia revealed prevalence of poorly differentiated B lymphoid and/or monoblastic features. Considering the whole series, ALL-1 rearrangements were significantly associated with female sex, higher white blood cell counts at presentation, and very poor clinical outcome. The presence of residual disease was molecularly documented in one case at the time of clinical remission after induction treatment and was followed by early relapse. We conclude that ALL-1 rearrangements are new molecular markers of human leukemia with considerable diagnostic and prognostic relevance.

Original languageEnglish
Pages (from-to)3800-3803
Number of pages4
JournalCancer Research
Issue number16
Publication statusPublished - 1993

ASJC Scopus subject areas

  • Cancer Research
  • Oncology


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