The distribution of the microarray probes throughout the genome is determined by the size of the gaps between the microarray targets.
Total RNA from 64 samples (14 from August, 2007; 17 from November, 2007; 17 from April, 2008; and 16 from June , 2008 was used to prepare microarray hybridization targets by reverse transcription into fluorescently labeled cDNA.
Fifty nanograms of total RNA were reverse transcribed and amplified by Microarray Target Amplification Kit (Roche diagnostics, Basel, Switzerland).
The labeled cRNA was purified using the Microarray Target Purification Kit (Roche), quantified by spectrophotometer and checked by agarose electrophoresis.
This deletion was confirmed by oligonucleotide microarray (targeted 60K oligonucleotide microarray performed at GeneDx, Gaithersburg, MD), as well as quantitative PCR of one of the genes (TAF4) in the deleted interval.
RC performed data analysis, assisted with the generation of microarray data, validated targets by qRT-PCR, wrote and revised the manuscript.
In conclusion, we have identified 124 TGF-β/SMAD targets by microarray experiments coupled with bioinformatics.
Many additional immune response related genes that were not originally identified as H1 targets by microarray analyses also exhibit strong upregulation.
We integrated data from the tiling microarrays with targets identified by Ingenuity Pathways Analysis software and observed epigenetic variations in genes implicated in epithelial mesenchymal transition and with tumor cell migration.
If they are regulated, for example, by sequestration rather than degradation or stabilization, no significant changes at the transcript level would occur, and we would not have identified such targets by our microarray studies.
