Chromosomal aneuploidy is a defining feature of epithelial cancers. The pattern of aneuploidies is cancer-type specific. For instance, the gain of chromosome 13 occurs almost exclusively in colorectal cancer. We used microcell-mediated chromosome transfer to generate gains of chromosome 13 in the diploid human colorectal cancer cell line DLD-1. Extra copies of chromosome 13 resulted in a significant and reproducible up-regulation of transcript levels of genes on chromosome 13 (
P
= .0004, FDR = 0.01) and a genome-wide transcriptional deregulation in all 8 independent clones generated. Genes contained in two clusters were particularly affected: the first cluster on cytoband 13q13 contained 7 highly up-regulated genes (
NBEA, MAB21L1, DCLK1, SOHLH2, CCDC169, SPG20
and
CCNA1
,
P
= .0003) in all clones. A second cluster was located on 13q32.1 and contained five upregulated genes (
ABCC4, CLDN10, DZIP1, DNAJC3
and
UGGT2, P
= .003). One gene,
RASL11A,
localized on chromosome band 13q12.2
,
escaped the copy number-induced overexpression and was reproducibly and significantly down-regulated on the mRNA and protein level (
P
= .0001, FDR = 0.002).
RASL11A
expression levels were also lower in primary colorectal tumors as compared to matched normal mucosa (
P
= .0001, FDR = 0.0001. Overexpression of
RASL11A
increases cell proliferation and anchorage independent growth while decreasing cell migration in +13 clones. In summary, we observed a strict correlation of genomic copy number and resident gene expression levels, and aneuploidy dependent consistent genome-wide transcriptional deregulation.