Human Gene Set: CAMPS_COLON_CANCER_COPY_NUMBER_UP


Standard name CAMPS_COLON_CANCER_COPY_NUMBER_UP
Systematic name M18750
Brief description Genes from chromosomal copy number gains in a panel of 51 primary colon carcinoma samples.
Full description or abstract Genomic aberrations on chromosome 8 are common in colon cancer, and are associated with lymph node and distant metastases as well as with disease susceptibility. This prompted us to generate a high-resolution map of genomic imbalances of chromosome 8 in 51 primary colon carcinomas using a custom-designed genomic array consisting of a tiling path of BAC clones. This analysis confirmed the dominant role of this chromosome. Unexpectedly, the position of the breakpoints suggested colocalization with structural variants in the human genome. In order to map these sites with increased resolution and to extend the analysis to the entire genome, we analyzed a subset of these tumors (n = 32) by comparative genomic hybridization on a 185K oligonucleotide array platform. Our comprehensive map of the colon cancer genome confirmed recurrent and specific low-level copy number changes of chromosomes 7, 8, 13, 18, and 20, and unveiled additional, novel sites of genomic imbalances including amplification of a histone gene cluster on chromosome 6p21.1-21.33 and deletions on chromosome 4q34-35. The systematic comparison of segments of copy number change with gene expression profiles showed that genomic imbalances directly affect average expression levels. Strikingly, we observed a significant association of chromosomal breakpoints with structural variants in the human genome: 41% of all copy number changes occurred at sites of such copy number variants (P < 2.2e(-16)). Such an association has not been previously described and reveals a yet underappreciated plasticity of the colon cancer genome; it also points to potential mechanisms for the induction of chromosomal breakage in cancer cells.
Collection C2: Curated
      CGP: Chemical and Genetic Perturbations
Source publication Pubmed 18316590   Authors: Camps J,Grade M,Nguyen QT,Hörmann P,Becker S,Hummon AB,Rodriguez V,Chandrasekharappa S,Chen Y,Difilippantonio MJ,Becker H,Ghadimi BM,Ried T
Exact source Table 2S
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Source species Homo sapiens
Contributed by Jessica Robertson (MSigDB Team)
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