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2017 ; 45
(7
): e51
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miSTAR: miRNA target prediction through modeling quantitative and qualitative
miRNA binding site information in a stacked model structure
#MMPMID27986855
Van Peer G
; De Paepe A
; Stock M
; Anckaert J
; Volders PJ
; Vandesompele J
; De Baets B
; Waegeman W
Nucleic Acids Res
2017[Apr]; 45
(7
): e51
PMID27986855
show ga
In microRNA (miRNA) target prediction, typically two levels of information need
to be modeled: the number of potential miRNA binding sites present in a target
mRNA and the genomic context of each individual site. Single model structures
insufficiently cope with this complex training data structure, consisting of
feature vectors of unequal length as a consequence of the varying number of miRNA
binding sites in different mRNAs. To circumvent this problem, we developed a
two-layered, stacked model, in which the influence of binding site context is
separately modeled. Using logistic regression and random forests, we applied the
stacked model approach to a unique data set of 7990 probed miRNA-mRNA
interactions, hereby including the largest number of miRNAs in model training to
date. Compared to lower-complexity models, a particular stacked model, named
miSTAR (miRNA stacked model target prediction; www.mi-star.org), displays a
higher general performance and precision on top scoring predictions. More
importantly, our model outperforms published and widely used miRNA target
prediction algorithms. Finally, we highlight flaws in cross-validation schemes
for evaluation of miRNA target prediction models and adopt a more fair and
stringent approach.