Total RNA was extracted using the RNeasy Mini kit (Qiagen Inc., Valencia, CA, USA) and the RNAprotect reagent (Qiagen) and DNA was removed by on-column DNase digestion with the RNase-Free DNase set (Qiagen). RNA quality and concentration was determined by analysis with an Agilent 2100 bioanalyzer at the Harvard-Partners Center for Genetics and Genomics (Harvard Medical School, Cambridge, MA USA).
Label
biotin
Label protocol
Biotinylated cRNA were prepared according to the standard Affymetrix protocol from 6 ug total RNA (Expression Analysis Technical Manual, 2001, Affymetrix).
Hybridization protocol
Following fragmentation, 10 ug of cRNA were hybridized for 16 hr at 45C on GeneChip U113A GeneChips were washed and stained in the Affymetrix Fluidics Station 400.
Scan protocol
GeneChips were scanned using the Affymetrix scanner GS 3000
Description
SAMPLE 3
Data processing
The data were analyzed with Microarray Suite version 5.0 (MAS 5.0) using Affymetrix default analysis settings and global scaling as normalization method. The trimmed mean target intensity of each array was arbitrarily set to 100.
