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Sökning: WFRF:(Scandura S)

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  • MacGrogan, D, et al. (författare)
  • Structural integrity and expression of the L3MBTL gene in normal and malignant hematopoietic cells
  • 2004
  • Ingår i: Genes, Chromosomes and Cancer. - : Wiley. - 1045-2257 .- 1098-2264. ; 41:3, s. 203-213
  • Tidskriftsartikel (refereegranskat)abstract
    • The human L3MBTL gene is located in 20q12, a region that is commonly deleted in myeloproliferative disorders (MPD), myelodysplastic syndromes (MDS), and acute myeloid leukemia (AML). L3MBTL is highly homologous to the D-lethal(3) malignant brain tumor [D-l(3)mbt] gene, which is a putative tumor-suppressor gene (TSG) identified in Drosophila and which is closely related to the Drosophila sex combs on midleg (SCM) protein, a member of the Polycomb group (PcG) family of transcriptional repressors. To examine whether L3MBTL functions as a "classic" TSG in human hematologic malignancies, we screened a panel of 17 myeloid leukemia cell lines and peripheral blood or bone marrow samples from 29 MDS and 13 MPD patients for mutations in the entire L3MBTL coding sequence, including intron/exon splice junctions. No mutations were identified, although two single nucleotide differences were found (in intron 14 and in exon 15), which were interpreted as polymorphic changes. We used real-time RT-PCR to quantify the level of L3MBTL mRNA in various normal myeloid and lymphoid cell populations. L3MBTL is expressed in normal CD34+ bone marrow cells, and we found that the pattern of L3MBTL expression was similar to that of BMIl, a well-studied PcG gene with oncogenic activity, suggesting that L3MBTL and BMII may be co-regulated during hematopoiesis. The expression of L3MBTL mRNA in 30 of 35 cell lines and 13 of IS AML samples was comparable to the level of L3MBTL expression in the normal cell populations. However, five leukemia cell lines showed no L3MBTL expression, and two of the AML samples showed aberrant L3MBTL expression. These data suggest that L3MBTL is not mutated in MDS or MPD. However, given the known dosage effects of PcG proteins in regulating gene expression, reduced or absent L3MBTL expression may be relevant in some cases of myeloid leukemia. (C) 2004 Wiley-Liss, Inc.
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