DNA from fresh frozen tissue was isolated using the wizard genomic DNA purification kit (Promega, Madison, WI), according to the manufacturer instructions.
Label
biotin
Label protocol
According to Affymetrix SNP 6.0 standard protocol
Hybridization protocol
According to Affymetrix SNP 6.0 standard protocol
Scan protocol
According to Affymetrix SNP 6.0 standard protocol
Data processing
Genotyping was performed using the CRLMM algorithm in the Oligo package (Lin, 2008), copy number analysis using the aroma affymetrix package (Bengtsson, 2009), and we constructed LAIR plots to visualize regions of LOH and allelic imbalance (Corver, 2008) in R software (version 2.8). We have used CNCHP log ratio file as an input in Nexus (BioDiscovery, USA) software (version 4.1) and performed HMM based SNP-FASST segmentation for copy number analysis.