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Target Discovery and Validation Reviews and Protocols

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Gene Networks 47<br />

Table 2<br />

Druggable Genes of MAL33 <strong>and</strong> CDC6<br />

Druggable<br />

Drug-affected Parents a Gr<strong>and</strong>parents a<br />

MAL33 (YBR297W): HSP82 (YPL240C): BAR1 (YIL015W):<br />

Maltose fermentation heat shock protein barrierpepsin precursor<br />

regulatory protein SRB4 (YER022W): GPA1 (YHR005C):<br />

DNA-directed RNA GTP-binding protein α<br />

polymerase II holoenzyme subunit of the pheromone<br />

<strong>and</strong> Kornberg’s mediator pathway<br />

(SRB) subcomplex KAR2 (YJL034W):<br />

subunit nuclear fusion protein<br />

CDC6 (YJL194W): ARP7 (YPR034W): GAL11 (YOL051W):<br />

cell division control component of SWI-SNF DNA-directed RNA<br />

protein global transcription polymerase II holoenzyme<br />

activator complex <strong>and</strong> <strong>and</strong> Kornberg’s mediator<br />

RSC chromatin (SRB) subcomplex subunit<br />

remodeling complex FAR1 (YJL157C):<br />

BAR1 (YIL015W): cyclin-dependent kinase<br />

barrierpepsin precursor inhibitor (CKI)<br />

SLA2 (YNL243W):<br />

cytoskeleton assembly<br />

control protein<br />

a “Parents” means these genes connected directly to the drug-affected genes. “Gr<strong>and</strong>parents”<br />

means there is one intermediary gene between these genes <strong>and</strong> the drug-affected genes (11).<br />

3.3. Time-Exp<strong>and</strong>ed Network Method for Identifying Drug-Active Pathways<br />

3.3.1. Time-Exp<strong>and</strong>ed Network Method<br />

Figure 2 shows the conceptual view of our strategy. As the first step (Fig. 2a),<br />

we use the Bayesian network <strong>and</strong> nonparametric regression model for estimating<br />

a gene network from disruptant microarray data. This model can even capture<br />

nonlinear relationships between genes <strong>and</strong> is appropriate to estimate the structure<br />

of the gene network. However, the probabilistic inference using the nonparametric<br />

regression models has several problems. One problem is that we need to<br />

consider the extrapolation for h<strong>and</strong>ling the drug response data in the estimated<br />

gene network. The other problem is that we need to consider the calibration that<br />

is a probabilistic inference from the value of the target gene to the distribution of<br />

its parent genes. The nonparametric regression in our Bayesian network model<br />

may not be suitable to consider the extrapolation problem <strong>and</strong> the calibration.

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