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Human Molecular Genetics, 2001, Vol. 10, No. 4 395-404
© 2001 Oxford University Press

Fusion of the MORF and CBP genes in acute myeloid leukemia with the t(10;16)(q22;p13)

Ioannis Panagopoulos1,+, Thoas Fioretos1, Margareth Isaksson1, Ulf Samuelsson2, Rolf Billström3, Bodil Strömbeck1, Felix Mitelman1 and Bertil Johansson1

1Department of Clinical Genetics, University Hospital, SE-221 85 Lund, Sweden, 2Department of Pediatrics, University Hospital, SE-581 85 Linköping, Sweden and 3Department of Internal Medicine, Division of Hematology, University Hospital, SE-221 85 Lund, Sweden

The CBP gene at 16p13 fuses to MOZ and MLL as a result of the t(8;16)(p11;p13) in acute (myelo)monocytic leukemias (AML M4/M5) and the t(11;16)(q23;p13) in treatment-related AML, respectively. We show here that a novel t(10;16)(q22;p13) in a childhood AML M5a leads to a MORF–CBP chimera. RT–PCR using MORF forward and CBP reverse primers amplified a MORF–CBP fusion in which nucleotide 3103 of MORF was fused in-frame with nucleotide 284 of CBP. Nested RT–PCR with CBP forward and MORF reverse primers generated a CBP–MORF transcript in which nucleotide 283 of CBP was fused in-frame with nucleotide 3104 of MORF. Genomic analyses revealed that the breaks were close to Alu elements in intron 16 of MORF and intron 2 of CBP and that duplications had occurred near the breakpoints. A database search using MORF cDNA enabled us to construct an exon–intron map of the MORF gene. The MORF–CBP protein retains the zinc fingers, two nuclear localization signals, the histone acetyltransferase (HAT) domain, a portion of the acidic domain of MORF and the CBP protein downstream of codon 29. Thus, the part of CBP encoding the RARA-binding domain, the CREB-binding domain, the three Cys/His-rich regions, the bromodomain, the HAT domain and the Glu-rich domains is present. In the reciprocal CBP–MORF, part of the acidic domain and the C-terminal Ser- and Met-rich regions of MORF are likely to be driven by the CBP promoter. Since both fusion transcripts were present, their exact role in the leukemogenic process remains to be elucidated.

+ To whom correspondence should be addressed. Tel: +46 46 173422; Fax: +46 46 131061; Email: ioannis.panagopoulos@klingen.lu.se


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