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2014 ; 8
(ä): 56
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Network topology-based detection of differential gene regulation and regulatory
switches in cell metabolism and signaling
#MMPMID24886210
Piro RM
; Wiesberg S
; Schramm G
; Rebel N
; Oswald M
; Eils R
; Reinelt G
; König R
BMC Syst Biol
2014[May]; 8
(ä): 56
PMID24886210
show ga
BACKGROUND: Common approaches to pathway analysis treat pathways merely as lists
of genes disregarding their topological structures, that is, ignoring the genes'
interactions on which a pathway's cellular function depends. In contrast,
PathWave has been developed for the analysis of high-throughput gene expression
data that explicitly takes the topology of networks into account to identify both
global dysregulation of and localized (switch-like) regulatory shifts within
metabolic and signaling pathways. For this purpose, it applies adjusted wavelet
transforms on optimized 2D grid representations of curated pathway maps. RESULTS:
Here, we present the new version of PathWave with several substantial
improvements including a new method for optimally mapping pathway networks unto
compact 2D lattice grids, a more flexible and user-friendly interface, and
pre-arranged 2D grid representations. These pathway representations are assembled
for several species now comprising H. sapiens, M. musculus, D. melanogaster, D.
rerio, C. elegans, and E. coli. We show that PathWave is more sensitive than
common approaches and apply it to RNA-seq expression data, identifying crucial
metabolic pathways in lung adenocarcinoma, as well as microarray expression data,
identifying pathways involved in longevity of Drosophila. CONCLUSIONS: PathWave
is a generic method for pathway analysis complementing established tools like
GSEA, and the update comprises efficient new features. In contrast to the tested
commonly applied approaches which do not take network topology into account,
PathWave enables identifying pathways that are either known be involved in or
very likely associated with such diverse conditions as human lung cancer or aging
of D. melanogaster. The PathWave R package is freely available at
http://www.ichip.de/software/pathwave.html.