Methylation, deletions, and amplifications of cancer genes constitute important mechanisms in carcinogenesis. For genome-wide analysis of these changes, we propose the use of Notl clone microarrays and genomic subtraction, because Notl recognition sites are closely associated with CpG islands and genes. We show here that the CODE (Cloning Of DEleted sequences) genomic subtraction procedure can be adapted to Notl flanking sequences and to CpG islands. Because the sequence complexity of this procedure is greatly reduced, only two cycles of subtraction are required. A Notl-CODE procedure can be used to prepare Notl representations (NRs) containing 0.1-0.5% of the total DNA. The NRs contain, on average, 10-fold less repetitive sequences than the whole human genome and can be used as probes for hybridization to Notl microarrays. These microarrays, when probed with NRs, can simultaneously detect copy number changes and methylation. Notl microarrays offer a powerful tool with which to study carcinogenesis.
|Original language||English (US)|
|Number of pages||6|
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|State||Published - Aug 2002|
ASJC Scopus subject areas