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2015 ; 5
(ä): 17841
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Hidden Markov induced Dynamic Bayesian Network for recovering time evolving gene
regulatory networks
#MMPMID26680653
Zhu S
; Wang Y
Sci Rep
2015[Dec]; 5
(ä): 17841
PMID26680653
show ga
Dynamic Bayesian Networks (DBN) have been widely used to recover gene regulatory
relationships from time-series data in computational systems biology. Its
standard assumption is 'stationarity', and therefore, several research efforts
have been recently proposed to relax this restriction. However, those methods
suffer from three challenges: long running time, low accuracy and reliance on
parameter settings. To address these problems, we propose a novel non-stationary
DBN model by extending each hidden node of Hidden Markov Model into a DBN (called
HMDBN), which properly handles the underlying time-evolving networks.
Correspondingly, an improved structural EM algorithm is proposed to learn the
HMDBN. It dramatically reduces searching space, thereby substantially improving
computational efficiency. Additionally, we derived a novel generalized Bayesian
Information Criterion under the non-stationary assumption (called BWBIC), which
can help significantly improve the reconstruction accuracy and largely reduce
over-fitting. Moreover, the re-estimation formulas for all parameters of our
model are derived, enabling us to avoid reliance on parameter settings. Compared
to the state-of-the-art methods, the experimental evaluation of our proposed
method on both synthetic and real biological data demonstrates more stably high
prediction accuracy and significantly improved computation efficiency, even with
no prior knowledge and parameter settings.