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2015 ; 43
(16
): 7779-89
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gab.com Text
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Integrated analysis of numerous heterogeneous gene expression profiles for
detecting robust disease-specific biomarkers and proposing drug targets
#MMPMID26261215
Amar D
; Hait T
; Izraeli S
; Shamir R
Nucleic Acids Res
2015[Sep]; 43
(16
): 7779-89
PMID26261215
show ga
Genome-wide expression profiling has revolutionized biomedical research; vast
amounts of expression data from numerous studies of many diseases are now
available. Making the best use of this resource in order to better understand
disease processes and treatment remains an open challenge. In particular, disease
biomarkers detected in case-control studies suffer from low reliability and are
only weakly reproducible. Here, we present a systematic integrative analysis
methodology to overcome these shortcomings. We assembled and manually curated
more than 14,000 expression profiles spanning 48 diseases and 18 expression
platforms. We show that when studying a particular disease, judicious utilization
of profiles from other diseases and information on disease hierarchy improves
classification quality, avoids overoptimistic evaluation of that quality, and
enhances disease-specific biomarker discovery. This approach yielded specific
biomarkers for 24 of the analyzed diseases. We demonstrate how to combine these
biomarkers with large-scale interaction, mutation and drug target data, forming a
highly valuable disease summary that suggests novel directions in disease
understanding and drug repurposing. Our analysis also estimates the number of
samples required to reach a desired level of biomarker stability. This
methodology can greatly improve the exploitation of the mountain of expression
profiles for better disease analysis.