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Amplification of the 11q23 region in acute myeloid leukemia

✍ Scribed by Hervé Avet-Loiseau; Catherine Godon; Jian-Yong Li; Axelle Daviet; Marie-Paule Mellerin; Pascaline Talmant; Jean-Luc Harousseau; Régis Bataille

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
245 KB
Volume
26
Category
Article
ISSN
1045-2257

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✦ Synopsis

Cytogenetic abnormalities involving the 11q23 region are found in both acute lymphoblastic leukemia (ALL) and myeloid leukemia (AML). Molecular consequences of 11q23 translocations are the formation of chimeric genes, all of them involving the MLL (mixed-lineage leukemia) gene. To evaluate the usefulness of fluorescence in situ hybridization (FISH) in detecting MLL rearrangements in AML, we analyzed 181 patients with an MLL-specific probe. Among them, we detected three patients with multiple FISH signals, reflecting genomic amplification of this chromosomal region. Extra copies of MLL have been reported previously in four patients, but did not correspond to a true gene amplification. For the first time, we describe genomic amplification of the 11q23 region (up to more than 50 copies) in AML patients. This genomic amplification could affect MLL, but other genes in the vicinity could also be the primary target.

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