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Absence of MLL gene rearrangement in de novo myelodysplastic syndromes (MDS)

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Abstract

The Mixed Lineage Leukemia (MLL) gene has been identified in 11q23 translocations. The aim of the present study is the investigation of the frequency of MLL gene rearrangements in cases of de novo myelodysplastic syndromes (MDS). Sixty-two patients with de novo MDS were included in the analysis. The detection of MLL gene rearrangements was performed by Southern blot. Clonal karyotypic abnormalities were found in 15/50 (30%) cases. 11q23 abnormalities were not detected. One case with RAEB and a complex karyotype presented a del (11)(q13); further analysis by FISH revealed loss of one copy of MLL gene in all metaphases. Southern blot revealed germline bands in all cases using Eco RI and in 61/62 cases with Bam HI. The case with RAEB and a del (11)(q13) revealed a rearranged band following only Bam HI digestion, but not Eco RI. Rearrangements of MLL gene within exons 5–9 were not identified in this series of adult de novo MDS, indicating that this molecular abnormality is not involved in the pathogenesis of this group of hemopoietic disorders.

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Pappa, V., Young, B.D., Economopoulos, T. et al. Absence of MLL gene rearrangement in de novo myelodysplastic syndromes (MDS). Ann Hematol 83, 170–175 (2004). https://doi.org/10.1007/s00277-003-0818-7

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  • DOI: https://doi.org/10.1007/s00277-003-0818-7

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