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- W2142260483 abstract "The MYCN oncogene is amplified in approximately 25% of neuroblastoma tumors and is the most significant negative prognostic factor. The direct transcriptional targets of MYCN in MYCN-amplified tumors have not been defined. Microarray analysis of RNA from neuroblastoma primary cell cultures revealed 10-fold higher MCM7 expression in MYCN-amplified versus nonamplified tumors. MCM7 is an essential component of DNA replication licensing factor, a hexameric protein complex that regulates DNA synthesis during the cell cycle, preventing rereplication and ensuring maintenance of DNA euploidy. Additional experiments demonstrated markedly increased expression of MCM7 RNA and protein in MYCN-amplified neuroblastoma tumors and cell lines. Induction of MYCN in conditional cell lines results in increased expression of endogenous MCM7 mRNA and a 3-fold increase in protein levels. In addition, luciferase activity from MCM7 promoter/luciferase gene reporter constructs was significantly increased under MYCN-induced conditions. Specific electrophoretic mobility shifts of MCM7 promoter sequences are detected in extracts of MYCN-amplified cells. These findings demonstrate that in neuroblastoma, the MYCN oncogene directly activates genes required for DNA replication, and this may contribute to neoplastic transformation of these MYCN-amplified tumors." @default.
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- W2142260483 date "2002-02-15" @default.
- W2142260483 modified "2023-09-23" @default.
- W2142260483 title "Minichromosome maintenance protein MCM7 is a direct target of the MYCN transcription factor in neuroblastoma." @default.
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