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2016 ; 32
(12
): i90-i100
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Jumping across biomedical contexts using compressive data fusion
#MMPMID27307649
Zitnik M
; Zupan B
Bioinformatics
2016[Jun]; 32
(12
): i90-i100
PMID27307649
show ga
MOTIVATION: The rapid growth of diverse biological data allows us to consider
interactions between a variety of objects, such as genes, chemicals, molecular
signatures, diseases, pathways and environmental exposures. Often, any pair of
objects-such as a gene and a disease-can be related in different ways, for
example, directly via gene-disease associations or indirectly via functional
annotations, chemicals and pathways. Different ways of relating these objects
carry different semantic meanings However, traditional methods disregard these
semantics and thus cannot fully exploit their value in data modeling. RESULTS: We
present Medusa, an approach to detect size-k modules of objects that, taken
together, appear most significant to another set of objects. Medusa operates on
large-scale collections of heterogeneous datasets and explicitly distinguishes
between diverse data semantics. It advances research along two dimensions: it
builds on collective matrix factorization to derive different semantics, and it
formulates the growing of the modules as a submodular optimization program.
Medusa is flexible in choosing or combining semantic meanings and provides
theoretical guarantees about detection quality. In a systematic study on 310
complex diseases, we show the effectiveness of Medusa in associating genes with
diseases and detecting disease modules. We demonstrate that in predicting
gene-disease associations Medusa compares favorably to methods that ignore
diverse semantic meanings. We find that the utility of different semantics
depends on disease categories and that, overall, Medusa recovers disease modules
more accurately when combining different semantics. AVAILABILITY AND
IMPLEMENTATION: Source code is at http://github.com/marinkaz/medusa CONTACT:
marinka@cs.stanford.edu, blaz.zupan@fri.uni-lj.si.