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Douglas, Eleanor J; Fiegler, Heike; Rowan, Andrew; Halford, Sarah; Bicknell, David C; Bodmer, Walter; Tomlinson, Ian P M; Carter, Nigel P
Cancer research (Chicago, Ill.), 07/2004, Letnik: 64, Številka: 14Journal Article
Array comparative genomic hybridization, with a genome-wide resolution of approximately 1 Mb, has been used to investigate copy number changes in 48 colorectal cancer (CRC) cell lines and 37 primary CRCs. The samples were divided for analysis according to the type of genomic instability that they exhibit, microsatellite instability (MSI) or chromosomal instability (CIN). Consistent copy number changes were identified, including gain of chromosomes 20, 13, and 8q and smaller regions of amplification such as chromosome 17q11.2-q12. Loss of chromosome 18q was a recurrent finding along with deletion of discrete regions such as chromosome 4q34-q35. The overall pattern of copy number change was strikingly similar between cell lines and primary cancers with a few obvious exceptions such as loss of chromosome 6 and gain of chromosomes 15 and 12p in the former. A greater number of aberrations were detected in CIN+ than MSI+ samples as well as differences in the type and extent of change reported. For example, loss of chromosome 8p was a common event in CIN+ cell lines and cancers but was often found to be gained in MSI+ cancers. In addition, the target of amplification on chromosome 8q appeared to differ, with 8q24.21 amplified frequently in CIN+ samples but 8q24.3 amplification a common finding in MSI+ samples. A number of genes of interest are located within the frequently aberrated regions, which are likely to be of importance in the development and progression of CRC.
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