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2018 ; 11
(ä): 14
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PathCORE-T: identifying and visualizing globally co-occurring pathways in large
transcriptomic compendia
#MMPMID29988723
Chen KM
; Tan J
; Way GP
; Doing G
; Hogan DA
; Greene CS
BioData Min
2018[]; 11
(ä): 14
PMID29988723
show ga
BACKGROUND: Investigators often interpret genome-wide data by analyzing the
expression levels of genes within pathways. While this within-pathway analysis is
routine, the products of any one pathway can affect the activity of other
pathways. Past efforts to identify relationships between biological processes
have evaluated overlap in knowledge bases or evaluated changes that occur after
specific treatments. Individual experiments can highlight condition-specific
pathway-pathway relationships; however, constructing a complete network of such
relationships across many conditions requires analyzing results from many
studies. RESULTS: We developed PathCORE-T framework by implementing existing
methods to identify pathway-pathway transcriptional relationships evident across
a broad data compendium. PathCORE-T is applied to the output of feature
construction algorithms; it identifies pairs of pathways observed in features
more than expected by chance as functionally co-occurring. We demonstrate
PathCORE-T by analyzing an existing eADAGE model of a microbial compendium and
building and analyzing NMF features from the TCGA dataset of 33 cancer types. The
PathCORE-T framework includes a demonstration web interface, with source code,
that users can launch to (1) visualize the network and (2) review the expression
levels of associated genes in the original data. PathCORE-T creates and displays
the network of globally co-occurring pathways based on features observed in a
machine learning analysis of gene expression data. CONCLUSIONS: The PathCORE-T
framework identifies transcriptionally co-occurring pathways from the results of
unsupervised analysis of gene expression data and visualizes the relationships
between pathways as a network. PathCORE-T recapitulated previously described
pathway-pathway relationships and suggested experimentally testable additional
hypotheses that remain to be explored.