Expression profiles of laser dissected colon tumor samples of wild-type mice and vil-Cre-Bcl9-/-/Bcl9l-/- mice

To investigate the impact of ablating Bcl9/Bcl9l on tumorigenesis, 6-8- week-old mice were exposed first to a single dose dimethylhydrazine (DMH, 44 mg/kg body weight), which is metabolized in the liver to carcinogenic azoxymethane (AOM), followed by 7 days oral administration of 2 % dextrane sulfate sodium (DSS) in the drinking water. This regimen results in the emergence of dysplastic adenomas, which progress to differentiated adenocarcinomas that are morphologically similar to human colorectal adenocarcinomas and typically harbor β-catenin stabilizing mutations of GSK3ß phosphorylation sites. Accordingly, these tumors present hallmarks of active Wnt signaling such as accumulation of nuclear β-catenin and expression of Wnt target genes. Total RNA of laser dissected samples from five different tumors each of two wild-type mice and three vil-Cre-Bcl9-/-/Bcl9l-/- mice was collected and resulting amplified cDNA hybridized to Affymetrix Mouse Genome 430 2.0 arrays. Samples are labeled as follows: Genotype_TumorID_MouseID_UniqueID.