Amplification ofCDK4andMDM2in malignant melanoma

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Amplification of the 12q13–15 region is a common event in several human tumors including liposarcomas, gliomas, and osteosarcomas. We have demonstrated high-level amplification of 12q14 in a subset of uncultured malignant melanomas (3 of 53). High-resolution mapping of the amplicon using quantitative PCR revealed a bipartite amplicon consisting of a primary 50-kb amplicon centered onCDK4and a secondary amplicon centered onMDM2, without amplification of the intervening 11 Mb of genomic DNA. Analysis of mRNA and protein levels in melanomas with 12q14 amplification demonstrated overexpression of target genesCDK4 and MDM2without loss of CDKN2A-P16 (P16INK4A) or CDKN2A-P14ARF (P14ARF) expression, important regulators of the RB1 and TP53 pathways, which are commonly lost or mutated in melanoma. These results suggest that coamplification ofCDK4 and MDM2may substitute for loss of P16INK4A and P14ARF function in a subset of melanomas. © 2006 Wiley-Liss, Inc.

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