Reducing the variability in cDNA microarray image processing by Bayesian inference.
BACKGROUND
Gene expression levels are obtained from microarray experiments through the extraction of pixel intensities from a scanned image of the slide. It is widely acknowledged that variabilities can occur in expression levels extracted from the same images by different users with the same software packages. These inconsistencies arise due to differences in the refinement of the placement of the microarray 'grids'. We introduce a novel automated approach to the refinement of grid placements that is based upon the use of Bayesian inference for determining the size, shape and positioning of the microarray 'spots', capturing uncertainty that can be passed to downstream analysis.


RESULTS
Our experiments demonstrate that variability between users can be significantly reduced using the approach. The automated nature of the approach also saves hours of researchers' time normally spent in refining the grid placement.
Department of Computer Science, Regent Court, 211 Portobello Road, Sheffield, S1 4DP, UK. neil@dcs.shef.ac.uk
Neil D
ND
Lawrence
Marta
M
Milo
Mahesan
M
Niranjan
Penny
P
Rashbass
Stephan
S
Soullier
D000465:Algorithms; D016477:Artifacts; D001499:Bayes Theorem; D020869:Gene Expression Profiling / Q000379:methods*; D014644:Genetic Variation; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008856:Microscopy, Fluorescence / Q000379:methods*; D008957:Models, Genetic; D015233:Models, Statistical; D015588:Observer Variation; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity