Inferring a transcriptional regulatory network of the cytokinesis-related genes by network component analysis
- Shun-Fu Chen†1,
- Yue-Li Juang†2,
- Wei-Kang Chou1,
- Jin-Mei Lai3,
- Chi-Ying F Huang4Email author,
- Cheng-Yan Kao5 and
- Feng-Sheng Wang1Email author
© Chen et al; licensee BioMed Central Ltd. 2009
Received: 13 January 2009
Accepted: 27 November 2009
Published: 27 November 2009
Network Component Analysis (NCA) is a network structure-driven framework for deducing regulatory signal dynamics. In contrast to principal component analysis, which can be employed to select the high-variance genes, NCA makes use of the connectivity structure from transcriptional regulatory networks to infer dynamics of transcription factor activities. Using the budding yeast Saccharomyces cerevisiae as a model system, we aim to deduce regulatory actions of cytokinesis-related genes, using precise spatial proximity (midbody) and/or temporal synchronicity (cytokinesis) to avoid full-scale computation from genome-wide databases.
NCA was applied to infer regulatory actions of transcription factor activity from microarray data and partial transcription factor-gene connectivity information for cytokinesis-related genes, which were a subset of genome-wide datasets. No literature has so far discussed the inferred results through NCA are independent of the scale of the gene expression dataset. To avoid full-scale computation from genome-wide databases, four cytokinesis-related gene cases were selected for NCA by running computational analysis over the transcription factor database to confirm the approach being scale-free. The inferred dynamics of transcription factor activity through NCA were independent of the scale of the data matrix selected from the four cytokinesis-related gene sets. Moreover, the inferred regulatory actions were nearly identical to published observations for the selected cytokinesis-related genes in the budding yeast; namely, Mcm1, Ndd1, and Fkh2, which form a transcription factor complex to control expression of the CLB2 cluster (i.e. BUD4, CHS2, IQG1, and CDC5).
In this study, using S. cerevisiae as a model system, NCA was successfully applied to infer similar regulatory actions of transcription factor activities from two various microarray databases and several partial transcription factor-gene connectivity datasets for selected cytokinesis-related genes independent of data sizes. The regulated action for four selected cytokinesis-related genes (BUD4, CHS2, IQG1, and CDC5) belongs to the M-phase or M/G1 phase, consistent with the empirical observations that in S. cerevisiae, the Mcm1-Ndd1-Fkh2 transcription factor complex can regulate expression of the cytokinesis-related genes BUD4, CHS2, IQG1, and CDC5. Since Bud4, Iqg1, and Cdc5 are highly conserved between human and yeast, results obtained from NCA for cytokinesis in the budding yeast can lead to a suggestion that human cells should have the transcription regulator(s) as the budding yeast Mcm1-Ndd1-Fkh2 transcription factor complex in controlling occurrence of cytokinesis.
Cytokinesis is the process that one cell divides into two daughter cells after segregation of the paired sister-chromatids is completed. Cytokinesis ensures that two daughter cells have identical genetic information, cytosolic components, and organelles. In animal cells, the midbody is a transient "organelle-like" structure whose components are indispensable for cytokinesis . Through proteomic analysis and literature reviews, 190 non-redundant proteins were identified as conserved in the mammalian midbody complex . Inappropriate regulation of midbody formation may significantly affect terminal cytokinesis events and result in a multi-nucleate phenotype, which may contribute to the development of cancer [1–4]. Therefore, understanding the mechanism that regulates formation of the midbody complex, and its role in cytokinesis, may allow us to gain more insight into cancer development.
In animal cells, the 22 conserved core components thought to be required for cytokinesis are PRC1, KIF4, MKLP1, CYK-4, Aurora B, Incenp, Survivin, and Borealin on the central spindle; myosin heavy chain, regulatory light chain, actin, formin, profilin, cofilin, and anillin in the contractile ring; RhoA, ECT2, ROCK, MYPT, and citron kinase in the RhoA pathway; syntaxin on the vesicle; and septin (see review by Glotzer, 2005) . In fact, these 22 core proteins, except for MKLP1, Borealin, KIF4, ROCK, MYPT, and citron kinase, also have counterparts in the budding yeast Saccharomyces cerevisiae[6–13]. Of note, the polo-like kinase has recently been shown to be the key regulator for initiation of cytokinesis in human and yeast cells, though it is not included in these 22 core components [12, 14]. Therefore, although the cytokinesis mechanism is somewhat more complex in human cells than in yeast cells, the fundamental aspects of the cytokinesis mechanism should be highly conserved. Furthermore, because no systematic analysis has been performed to identify cytokinesis-related genes in S. cerevisiae, information from proteomic analysis of the mammalian midbody complex will be useful as a comparable reference for cytokinesis of budding yeast.
Microarray technology has made it possible to monitor gene expression levels on a genome-wide scale. To uncover useful information from very large amounts of microarray data, we should consider various approaches exquisitely suited for multidimensional problems. An attractive approach for studying transcriptional regulation at the genomic scale is to use transcription factor activities (TFAs) to represent gene expression dynamics. In general, transcriptional activity is largely controlled by a relatively small set of transcription factors, which are themselves regulated transcriptionally and/or post-transcriptionally. In addition to synthesis, the level of mRNA is also controlled by "degradation factors" that regulate mRNA stability.
Network component analysis (NCA) developed by Liao et al. has been applied to deduce TFAs in transcriptional regulatory networks from both the microarray data and the partial transcription factor (TF)-gene connectivity information [15–19]. In this study, NCA will be applied to infer the dynamic behaviors of the cytokinesis-related genes. However, human cytokinesis-related genes have not been completely elucidated, so that smaller datasets are available for inferring TFAs in the cytokinesis-related genes through NCA. In this work, various data sizes for the cytokinesis-related genes will be applied to deduce TFAs. Therefore, we can validate that NCA is independent of the size of the collected information.
Network component analysis (NCA) is applied for deducing regulatory signals or transcription factor activities (TFAs). NCA is a network structure-driven framework for deducing regulatory signal dynamics. In contrast to classical approaches such as principal component analysis (PCA) or independent component analysis, NCA makes use of the connectivity structure from transcriptional regulatory networks to restrict the decomposition to a unique solution.
Three criteria for the original NCA must be satisfied [16, 24] to ensure unique solutions to the matrix decomposition problem. The criteria can be summarized as: (i) The control strength matrix A must have full-column rank; (ii) When a node in the regulatory layer is removed along with all of the output nodes connected to it, the resulting network must be characterized by a connectivity matrix that still has full-column rank. This condition implies that each column of A must have at least L-1 zeros; and (iii) The TFA matrix P must have full row rank for the original NCA. In other words, no regulatory signal can be expressed as a linear combination of the other regulatory signals. The third criterion implies that the number of TFAs analyzed must be smaller or equal to the number of data points. This criterion significantly limits the number of TFAs that can be derived from microarray data. Galbraith et al.  have introduced the REDUCE method to relax the third criterion to allow the number of TFs is greater than the number of experiments. In this study, we first apply the first and second criteria to reconstruct the full-column rank data matrix and initial control matrix, As a result, the number of genes is greater than the number of TFs so that the third criterion is automatically satisfied. NCA has shown its effectiveness in discovering regulators and inferring TFAs when both microarray data and transcription factor-gene connectivity information are available. Network component mapping  and motif-directed NCA  have introduced to deduce hidden networks due to limit topology information available. Several algorithms for NCA have been applied to overcome problems of convergence and stability. In this study, we use the NCA algorithm downloaded from the web site, http://www.seas.ucla.edu/~liaoj/, to compute all case studies.
Results and Discussion
Transcriptional regulation is quite complex in mammalian cells. It will become somewhat difficult to specify the transcriptional regulation at proper spatial/temporal conditions such as cytokinesis. Fortunately, the basis of the cytokinesis mechanism is highly conserved between human and yeast cells. Furthermore, systematic analyses for cell cycle expression profiles of all the Saccharomyces cerevisiae genes have been performed and are available in databases [27, 28]. Therefore, we will use S. cerevisiae as a model system to simplify our approach to building up an inference system for identifying the relationship between transcription regulation of novel genes and the occurrence of cytokinesis. Because the midbody complex is indispensable for cytokinesis in animal cells, we used the HomoloGene database, that is available at the http://www.ncbi.nlm.nih.gov/homologene/, to determine whether yeast homologs exist for 190 human midbody proteins collected from midbody proteomics analysis and other published observations. It turns out that 39 of 190 known human midbody proteins have homologs in S. cerevisiae. In addition, 21 cytokinesis-related genes systematically identified in fission yeast also have homologs in S. cerevisiae[29–31]. Altogether, 60 non-redundant cytokinesis-related genes were collected for our analysis (Additional File 1: Table S1).
We first analyzed the S. cerevisiae cell cycle expression database that is available at the website http://genome-www.stanford.edu/cellcycle/. The time-course microarray database for 6178 genes was collected at 18 different time points in an α-factor arrest/release experiment. Of note, some gene expression data are missing in this time-course microarray database. However, many algorithms for gene expression analysis, including NCA and PCA, require a complete matrix of gene array values as input. Therefore, the singular value decomposition method, the weighted K-nearest neighbors method, and the row average method were applied to estimate such missing values in this microarray database . We found that the K-nearest neighbor method gave a more accurate estimation of missing microarray data than the other two . The estimated values were added to the time-course microarray database to allow us to select the expression data of 60 cytokinesis-related genes we collected to infer transcriptional regulatory network through NCA.
The first, second and third principal components for gene expression levels in an α-factor/release experiment.
Absolute Loading value
The control strength matrix inferred from various gene expression data.
Following similar procedures as discussed in Cases I and II, these genes are then applied to construct the matrix E and the connective structure of the control strength matrix A through the gene-TF database. Some of the genes are not included in the database. Therefore, 10 genes listed in Case III of Figure 1 are used to select the 447 × 18 data matrix and 447 × 11 initial control strength matrix, and then to infer the corresponding control strength and TFAs. In Case IV of Figure 1, 6 genes are made up from the first principal component, except MYO1, which belong to the M-phase, and GPA1 in the M/G1 phase of the second principal component. These genes are used to construct the 348 × 18 data matrix and 348 × 7 initial control strength matrix. Applying the decomposition computation in the equation (5) (see methods), we yield the 7 TFA profiles and their corresponding gene expressions as shown (—▯— curves) in Figures 2 and S1. The inferred TFA profiles for Case I (—Š— curves), II (— curves), and III (—▼— curves) are also shown in Figures 2 and S1, and are nearly identical to Case IV. This fact indicates that the inferred TFA profiles are independent of the scale of the data matrix. The inferred control strength matrix A is listed in Table 2 and Additional File 1: Table S4. In a biological network, elasticity coefficients, which are referred to as relative sensitivities, are used as a measurement to evaluate how relative influence for a rate to a variable. From equation (1), we can evaluate each elasticity coefficient, i.e., to compute the relative sensitivity for each rate synthesis, Vsynthesis, with respect to each TFA, which equals to the control strength. Ndd1 regulated on gene CHS2 has the higher strength of 3.1035, as observed from Table 2. On the other hand, Fkh2 regulated on CHS2 is the highest negative regulation.
The regulated actions for each TF in midbody genes.
(-, -, -, -), [-]
(-, -, -, +), [-]
(-, +, +, +)
(+, +, +, +), [+]
(+, +, +*, -), [+]
(+, +, +, +)
(-, +, +,-), [-]
(-, -, -, -), [-]
(+, -, -,+*)
(+, -, +, +), [+]
(-, +, +, -)
(-, -, -, -), [-]
(-, -, -, +)
(+, +*, -*, +), [+]
(+, +, +, +), [+]
The control strength matrix inferred from various gene expression data.
The regulated actions for each TF in cytokinesis-related genes.
In S. cerevisiae, Mcm1, Ndd1, and Fkh2 form a transcription factor complex to control expression of the CLB2 cluster, which is comprised of a group of 35 cell cycle-regulated genes that are transcribed from the end of the S phase to nuclear division [27, 28, 40]. Of these 35 CLB2 cluster genes, BUD4, CHS2, CYK2, MYO1, IQG1, ASE1, CDC5, DBF2, MOB1, and TEM1 have been shown to have a role in cytokinesis [6, 11, 41–47]. In particular, BUD4, CHS2, IQG1, and CDC5 were selected in NCA. More importantly, like human polo-like kinase PLK1 , the polo-like kinase Cdc5 is also a key regulator essential for occurrence of cytokinesis . Cdc5 has a role in activating Rho1 for contractile actin ring formation at the bud neck and hence promotes cytokinesis .
The activity of the Mcm1-Ndd1-Fkh2 complex is known to be up-regulated through phosphorylation of Fkh2 by the Clb5/Cdc28 kinase complex and Ndd1 by the Clb2/Cdc28 kinase complex and Cdc5 [48–51]. Obviously, expression of CLB2 and CDC5 genes are regulated through positive feedback control. Because Mcm1, Ndd1, and Fkh2 localize to the nucleus but not to the bud neck where cytokinesis occurs, they are unlikely to have a direct role in cytokinesis, but instead form a transcription factor complex to function as a key regulator for expression of cytokinesis-related proteins, such as Cdc5, to allow occurrence of cytokinesis.
Network component analysis is a data decomposition method for reconstructing regulatory signals and control strengths by using partial and qualitative network connectivity information. This method contrasts with traditional statistical techniques, such as principal component analysis and independent component analysis, in that it does not make any assumption regarding the statistical properties of the regulatory signals. Rather, network structure, even if incompletely known, is used to generate a network consistent representation of the regulatory signals. This method is validated experimentally by using absorbance spectra and then applied to transcriptional regulatory networks. Applying NCA deducing a regulatory network, we address whether the inference is sensitive to the size of dataset used. This is an interesting contribution to the field of network inference. In this study, NCA was applied to infer regulatory actions of transcription factor activities from a microarray database and partial transcription factor-gene connectivity information for cytokinesis-related genes. We could not establish a full scale NCA for the cytokinesis-related genes due to the lack of genome-wide information. Four gene selection cases were respectively applied to infer the dynamics of TFAs in order to validate that the inferred dynamics of TFAs through NCA were independent of the scale of the data matrix. From the computational results, the inferred TFA dynamics are almost identical despite variations in data sizes for cytokinesis-related genes. On the other hand, PCA could be employed to select the higher-variance genes. In this study, we found that higher-variance genes from the first and second principal components were cytokinesis-related genes that belonged to the M-phase or M/G1 phase. Moreover, the control strengths are equivalent to the elasticity coefficients in a biological network. Each inferred value indicates the connective strength for the TF regulated on the corresponding gene. Higher values indicate higher interaction levels. Since, in the budding yeast, the Mcm1-Ndd1-Fkh2 transcription factor complex can regulate expression of the cytokinesis-related genes BUD4, CHS2, IQG1, and CDC5 that were selected in NCA, our studies revealed that NCA could be successfully applied for inferring the transcriptional regulatory network of cytokinesis-related proteins in cytokinesis.
Bud4, Iqg1, and Cdc5 are respectively yeast counterparts of human midbody-associated proteins ANLN (anillin), IQGAP1, and PLK1 that are required for cytokinesis. More importantly, both the budding yeast Cdc5 and human PLK1 are key regulators for initiation of cytokinesis. Therefore, in this study, results obtained from NCA for cytokinesis in the budding yeast can lead to a suggestion that human cells should have the transcription regulator for expression of ANLN, IQGAP1 or PLK1 as the budding yeast Mcm1-Ndd1-Fkh2 transcription factor complex in controlling occurrence of cytokinesis.
This research was supported by grants from NSC (Program for Interdisciplinary Research Project: NSC97-2627-B-010-011 to C. Huang, NSC97-2627-B-030-001 to J.-M. Lai, NSC96-2627-B-194-001 to F.-S. Wang, and NSC97-2627-B-002-005 to C.-Y. Kao), and NSC97-3112-B-010-025-CC1 and the Program for Promoting Academic Excellence of Universities (National Yang Ming University) to C. Huang.
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