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2017 ; 7
(1
): 14567
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Chemical Similarity Enrichment Analysis (ChemRICH) as alternative to biochemical
pathway mapping for metabolomic datasets
#MMPMID29109515
Barupal DK
; Fiehn O
Sci Rep
2017[Nov]; 7
(1
): 14567
PMID29109515
show ga
Metabolomics answers a fundamental question in biology: How does metabolism
respond to genetic, environmental or phenotypic perturbations? Combining several
metabolomics assays can yield datasets for more than 800 structurally identified
metabolites. However, biological interpretations of metabolic regulation in these
datasets are hindered by inherent limits of pathway enrichment statistics. We
have developed ChemRICH, a statistical enrichment approach that is based on
chemical similarity rather than sparse biochemical knowledge annotations.
ChemRICH utilizes structure similarity and chemical ontologies to map all known
metabolites and name metabolic modules. Unlike pathway mapping, this strategy
yields study-specific, non-overlapping sets of all identified metabolites.
Subsequent enrichment statistics is superior to pathway enrichments because
ChemRICH sets have a self-contained size where p-values do not rely on the size
of a background database. We demonstrate ChemRICH's efficiency on a public
metabolomics data set discerning the development of type 1 diabetes in a
non-obese diabetic mouse model. ChemRICH is available at
www.chemrich.fiehnlab.ucdavis.edu.