title: Integrating probe-level expression changes across generations of Affymetrix arrays.
abstract: There is an urgent need for bioinformatic methods that allow integrative analysis of multiple microarray data sets. While previous studies have mainly concentrated on reproducibility of gene expression levels within or between different platforms, we propose a novel meta-analytic method that takes into account the vast amount of available probe-level information to combine the expression changes across different studies. We first show that the comparability of relative expression changes and the consistency of differentially expressed genes between different Affymetrix array generations can be considerably improved by determining the expression changes at the probe-level and by considering the latest information on probe-level sequence matching instead of the probe annotations provided by the manufacturer. With the improved probe-level expression change estimates, data from different generations of Affymetrix arrays can be combined more effectively. This will allow for the full exploitation of existing results when designing and analyzing new experiments.
authors.affiliation: Department of Mathematics, FIN-20014, University of Turku, Finland. laliel@utu.fi
authors.forename: Laura L
authors.initials: LL
authors.lastname: Elo
authors.forename: Leo
authors.initials: L
authors.lastname: Lahti
authors.forename: Heli
authors.initials: H
authors.lastname: Skottman
authors.forename: Minna
authors.initials: M
authors.lastname: Kyläniemi
authors.forename: Riitta
authors.initials: R
authors.lastname: Lahesmaa
authors.forename: Tero
authors.initials: T
authors.lastname: Aittokallio
mesh_terms: D000818:Animals; D002460:Cell Line; D005260:Female; D020869:Gene Expression Profiling / Q000379:methods*; D006801:Humans; D015201:Meta-Analysis as Topic; D051379:Mice; D008807:Mice, Inbred BALB C; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D015345:Oligonucleotide Probes; D015203:Reproducibility of Results; D018401:Sample Size
chemical_list: D015345:Oligonucleotide Probes