The wave of high-throughput technologies in genomics and phenomics are enabling data to be generated on an unprecedented scale and at a reasonable cost. Exploring the large-scale data sets generated by these technologies to derive biological insights requires efficient bioinformatic tools. Here we introduce an interactive, open-source web application (HTPmod) for high-throughput biological data modeling and visualization. HTPmod is implemented with the Shiny framework by integrating the computational power and professional visualization of R and including various machine-learning approaches. We demonstrate that HTPmod can be used for modeling and visualizing large-scale, high-dimensional data sets (such as multiple omics data) under a broad context. By reinvestigating example data sets from recent studies, we find not only that HTPmod can reproduce results from the original studies in a straightforward fashion and within a reasonable time, but also that novel insights may be gained from fast reinvestigation of existing data by HTPmod.
Over the last decade, technological advances in genomics (e.g., high-throughput sequencing, HTS) and phenomics (high-throughput plant phenotyping, HTP) have resulted in a tremendous increase of molecular and phenotypic data from large number of samples with a high-dimensional list of measurements. As a result, we can acquire an extensive range of phenotypes at organism-wide scale1,2, quantify the expression of tens of thousands of genes3,4,5, and measure the entire epigenome6,7 or regulatome8,9,10 simultaneously for hundreds to thousands of samples at a reasonable cost. The immense volume, variety, velocity, and veracity of high-throughput biological data generated by these technologies make it a big data problem11,12,13. In this regard, data handling and processing remain a major technical bottleneck when translating big biological data into knowledge.
Extracting hidden patterns and making accurate predictions from these massive data sets largely rely on machine-learning approaches14,15. From a computational point of view, machine learning methods are attractive in terms of their ability to derive predictive models without a need for strong assumptions about underlying mechanisms; hence they are especially useful to deal with certain biological questions of which our a priori knowledge is frequently unknown or insufficiently defined14. As a proof of concept, gene expression levels can be accurately predicted from a broad set of epigenetic features16,17,18,19,20 or binding profiles of diverse transcription factors (TFs)21,22,23,24 using various machine-learning-based approaches, although our knowledge about how the selected features determine the expression output is largely unknown. Modeling is, therefore, a key ingredient to derive novel biological insights by integrating large-scale data sets. Generally, a canonical machine learning workflow consists of the model fitting and evaluation. Although conceptually simple, applying adequate machine-learning algorithms to the large corpus of data remains an important challenge since it requires substantial computational expertise and effort. To our knowledge, an integrative web-based application for interactive exploration and interpretation of large-scale, high-dimensional data sets is not available to date. Here we present an interactive web application, HTPmod (http://www.epiplant.hu-berlin.de/shiny/app/HTPmod/), for high-throughput biological data modeling and visualization. By reinvestigating example data sets from recent studies, we demonstrate that HTPmod can be used for modeling and visualizing multiple types of omics data (such as phenomics, transcriptomics, metabolomics, and epigenomics data) under a broad context in a straightforward and an efficient fashion.
Overview of the HTPmod application
By integrating existing machine-learning approaches applied in high-throughput experiments1,25,26, HTPmod was implemented with the Shiny framework (http://shiny.rstudio.com/), which combines the computational power of R with friendly and interactive web interfaces. HTPmod provides three function modules for modeling (growMod and predMod) and visualizing (htpdVis) data especially from high-throughput experiments, such as HTP and HTS (Fig. 1 and Supplementary Fig. 1). Besides, HTPmod accepts the simplest table files as the only input (Fig. 1a and Supplementary Fig. 2) and supports the generation of various types of publication-quality graphics (Fig. 1b–d) and tables with possible customizations. Whenever possible, HTPmod adopts parallel computing to speed up analysis.
The growMod module for plant growth modeling
The first module in HTPmod, growMod, was developed for plant growth modeling based on time-series data, e.g., from plant HTP experiments1,27. HTP is an ideal tool to study plant growth in a noninvasive way. We previously showed that the growth of barley (Hordeum vulgare) plants under normal and drought stress growth conditions follows a logistic curve and a bell-shaped curve, respectively1. In this study, we provided a graphical user interface (GUI) to perform growth modeling in an easy and efficient way (Fig. 1b). Generally, input data for growMod can be extracted from images by existing HTP image analysis software, such as IAP28 or PlantCV27,29. Image-derived features, such as plant height, project area and digital volume are some examples of traits that can be used to model plant growth. The growMod tool supports growth modeling for normal and stressed plants, which can be done either at single plant level or at group level (i.e., replicates in a group or a genotype). Moreover, we included several mechanistic growth models (including linear, bell-shaped, quadratic, exponential, monomolecular, logistic, Weibull and Gompertz curves; Supplementary Table 1) so that the performance of each model can be compared and evaluated (see Methods). Users can choose proper growth models to predict plant growth in their studies. Finally, biologically interpretable parameters can be derived from these models and can be further used for association mapping in a large population, allowing a deeper understanding of the performance and genetic basis of plant growth1.
The predMod module for prediction
The second module predMod was implemented with several supervised machine-learning models to relate input features (e.g., image data from HTP, and TF binding and histone modification data from HTS) to output quantities of interest (e.g., plant biomass, yield, stress status, or gene expression levels). The predMod tool is typically useful in situations where large amounts of data are available, with the aim to understand how a combination of factors (inputs) influence the output trait. In particular, the prediction models can be used for either regression (where output consists of numeric values) or classification (where output is a categorical class label). For instance, such prediction models have been widely used to predict the contribution of chromatin features to the change of gene expression18,21,30, to predict plant biomass from image-derived features25,27,31, to classify plants in different stress status1 or disease status32 based on image data, or to discriminate organ-specific target genes based on SELEX-seq data26. We integrated more than 30 widely used machine-learning approaches (Supplementary Table 2) into the predMod module, for regression or classification analyses (Fig. 1c). The prediction performance can be evaluated when multiple prediction models are selected18,25,30 (see Methods). Furthermore, feature importance and their prediction power can be extracted from the models18,21,25,30, which may aid for feature selection (e.g., to find potentially interesting features).
The htpdVis module for visualization
However, when there is no prior knowledge of the data investigated, unsupervised machine-learning approaches can be used to discover patterns from large data sets. To this end, we developed a third module, htpdVis, to explore and visualize large-scale, high-dimensional data using various unsupervised machine-learning approaches, such as principal component analysis (PCA), t-distributed stochastic neighbor embedding (t-SNE)33, self-organizing map, multidimensional scaling, K-means clustering or hierarchical cluster analysis with heatmaps (Fig. 1d). This module is particularly useful for exploration of hidden patterns and exploratory data mining from omics data sets such as phenome1, transcriptome34,35,36, or epigenome data37. For example, in PCA, the results of top principal components (PCs) are usually shown in a scatterplot where both the component scores (the transformed variable values of data points) and the factor loadings (the correlation coefficients between the observations [rows] and factors or features [columns]) are plotted in the same graphs (Fig. 1d). In addition, we also implemented the PCA with self-organizing map clustering approach, which is a useful way to visualize and explore multidimensional data sets, such as gene expression data across tissues in multiple species38,39,40. Notably, in the htpdVis module, different parameter settings can be used to generate diverse types of graphs with color and shape schema highlighting important data features (Fig. 1d).
Applications of HTPmod
To demonstrate the universal applications of HTPmod in data exploration and visualization, we provided various example data sets from recent studies (Supplementary Table 3) spanning phenomics1,25,27, metabolomics41, epigenomics37, regulatomics21,26 and transcriptomics42. We explored these data using the various functionalities implemented in our HTPmod system (see also online application for demonstrations). We showed that not only can HTPmod reproduce the corresponding findings of the original studies but also can gain novel insights from existing published data in a straightforward fashion and within a reasonable time (Supplementary Figs. 3-13).
Here, we briefly described two case studies to show the power of HTPmod in data modeling and visualization. The first case study is to predict gene expression patterns using TF binding data in Arabidopsis thaliana, as shown in a recent study21. Briefly, we collected gene expression data from the supplemental data of ref. 21. and TF binding profiles from the Gene Expression Omnibus (GEO) database with an accession number GSE80568. The input data (consisting a matrix of TF binding score and expression changes for the differentially expressed genes) for HTPmod were prepared in a similar way as Song et al.21. We ran the predMod module with 16 regression models to relate TF binding strength to gene expression changes (log-transformed fold change [FC]) under ABA (phytohormone abscisic acid) treatment compared to mock. Strikingly, all the tested models show relatively comparable performance (Fig. 2 and Supplementary Fig. 7), implying that these models capture the intrinsic determinant of TF binding to the gene expression outcome. In addition, the relative feature importance determined by a glmnet regression model (Fig. 3) is consistent to the results presented in the original study21.
The second case study is to visualize floral organ-specific gene expression patterns42 by the htpdVis module. Domain-specific translatome data were obtained from the supplemental file of ref. 42. Based on analysis of variance (ANOVA), we identified 6072 genes that show significant spatiotemporal domain effects (p-value <0.05 based on ANOVA) with at least two-fold change (FC > 2) between different domains. We then filtered 678 domain-specific genes (see online document for more details) that were highly expressed in AP1-specific (specifying the sepal organ), AG-specific (carpel), AP1/AP3-common (petal), or AP3/AG-common (stamen) domains. We projected the data onto three dimensions via t-SNE plots based on htpdVis (Fig. 4a, b), which confirms that these organ-specific genes show well defined, distinct expression pattern. When adding more genes with unknown organ signature into visualization, we observed spatiotemporal gene expression trajectories during floral organ development (Fig. 4c). These observations provide an important starting point to investigate the mechanisms regulating organ differentiation in plants. In summary, the above results strongly support that HTPmod can make fast reproducible analysis without any programming demand.
In this work, we developed and characterized a web application for modeling and visualizing large-scale biological data sets. As implemented with the Shiny framework, the HTPmod application inherits the computational power as well as professional visualization of R. To avoid excessively long run-times, HTPmod also allows parallel computing to speed-up analysis whenever possible, facilitated by the BiocParallel package (http://bioconductor.org/packages/release/bioc/html/BiocParallel.html). The BiocParallel allows parallelization either on local web machine or on a cluster of computers using specific job schedulers. In short, HPTmod offers three modules (growMod, predMod, and htpdVis) for exploratory or interactive data mining with various omics data sets. An obviously distinctive feature of HTPmod is that it integrates widely used mathematical models (Supplementary Table 1) and machine-learning approaches (Supplementary Table 2) and runs them in a uniform way on a single data set, therefore allowing direct comparison and evaluation of the performance of different methods. However, different models may show distinct performance for a specific data set. In this respect, we may choose a model of interest or a model with the best performance in the analysis. Furthermore, model-derived knowledge, such as parameters to describe plant growth and performance1, and feature importance scores18,20,25, may allow important biological interpretation and be promising for providing novel insights.
In order to demonstrate that HTPmod is powerful for modeling and visualization of large-scale biological data in different contexts, we provided several case studies ranging from genomics to phenomics1,21,25,26,27,37,41,42 (Supplementary Table 3) and have shown that HTPmod is an easy-to-use tool that generates reproducible results in a very efficient way. Compared to existing analysis protocols38,43,44, HTPmod offers several advantages. First of all, HTPmod provides user friendly web interfaces to run a diverse set of models for data modeling and visualization based on a single input file, thus without the need of programming experience. Second, HTPmod can generate a variety of plots for publication purposes based on a single data set. Finally, HTPmod is open source and highly extendable. New prediction models can be easily integrated into HTPmod (see the online document). We will continue to integrate more prediction models or visualization/analysis components in the future. For example, deep learning is an emerging approach in the field of machine learning that can be used for image-based analytical tasks in plant phenotyping45,46,47. We believe that the data organization and visualization features offered by HTPmod are valuable for data scientists trying to apply deep learning to their HTP images.
As more and more big genomic and phenomic data sets are being or are going to be generated by large-scale, high-throughput experiments, the methodological framework for data modeling and visualization proposed in this work will have broadly potential applications. We anticipate that the plentiful output generated by HTPmod on a single data set will be useful to advance our views of a specific biological question under investigation. In summary, HTPmod is an open-source, interactive, and powerful web platform for large-scale biological data modeling and visualization.
Growth modeling (growMod)
With HTP data, image-derived features like plant height, projected area27 and digital volume1 can be considered as growth-related traits for growth modeling. In the growMod module, plant growth in control conditions can be modeled with six different mechanistic models: linear, exponential, monomolecular, logistic, Gompertz, and Weibull models (Supplementary Table 1). In order to fit these models using the linear regression function “lm” in R, the non-linear relationship of the models were first transformed into linearized forms (Supplementary Table 1). The growth traits are then fitted with the linearized models. Finally, the performance of models is assessed and compared based on their R2 and p-values. Some useful parameters can be derived from these models. For example, for the logistic model, the following three parameters are important to describe plant growth performance:1 (1) the intrinsic growth rate (R) that measures the speed of growth; (2) the inflection point (IP) that represents the time point when plant reaches the maximal speed of growth; and (3) the maximum final vegetative biomass (Kmax), which was estimated for each plant on the basis that the model could fit the data with the largest R2.
We also implemented several models to predict plant growth in in drought stress conditions1 (Supplementary Table 1). The modeling steps are divided into two parts: (1) growth before and during the stress phase and (2) re-growth during recovery phase. In the first phase, three different bell-shaped curves and a quadratic curve are fitted to the data, while in the recovery phase a simple linear model is used to characterize re-growth with the speed of re-growth (Rrec).
Prediction models (predMod) for regression or classification analysis
We included 32 widely used machine-learning approaches (Supplementary Table 2) into the predMod module, for regression or classification analysis purposes. Based on the powerful functionality of the caret R package and the uniform criteria for model performance evaluation (see below), predMod enables to run these models in a similar manner with comparable output.
To evaluate the performance of the predictive models, we adopted a k-fold cross-validation strategy to check the prediction power of each model. Specifically, each data set will be randomly divided into a training set ((k − 1)/k of individuals) and a testing set (1/k of individuals). A specific model is first trained on the training data and then applied to make prediction for the testing data. The final performance of models is evaluated and compared based on the average prediction accuracies obtained from N resampling of the data set (N-times randomization), where both k and N are defined by users.
For regression models, their predictive performance can be measured by the Pearson correlation coefficient (PCC; r) between the predicted values and the observed values; and the coefficient of determination (R2) which equals to the fraction of variance explained by the model, defined as
where SSres and SStot are the sum of squares for residuals and the total sum of squares, respectively, \(\hat y_i\) the predicted and yi the observed value of the ith plant, \(\bar y\) is the mean value of the observed values; and the root mean squared relative error of cross-validation, defined as
where s denotes the sample size of the testing data set.
We repeated the cross-validation procedure ten times. The mean and standard deviation of the resulting R2 and RMSRE values were calculated across runs.
The predictive bias μ between the predicted and observed values, defined as
where n denotes the sample size of the data set. This bias indicates overestimation (μ > 0) or underestimation (μ > 0) of the target feature.
For classification models, their predictive performance can be measured by: (1) a confusion matrix, which is the contingency table of actual versus predicted class labels for each class, and is particularly helpful in the case of multiclass classification; (2) scalar characteristics as the accuracy, and average area under the ROC curve (see below); (3) a receiver operating characteristic (ROC) curve by plotting the true positive rate (TPR) against the false-positive rate (FPR) at various threshold settings, which is particularly helpful in two class problems; (4) a precision-recall curve (PRC)48 showing the tradeoff between precision and recall at different thresholds, which is particularly useful when the classes are very imbalanced.
Influence of features on prediction performance
We also developed several criteria to evaluate the relative importance of features for the prediction. For the models (including random forest, stochastic gradient boosting, classification and regression trees and multivariate adaptive regression spline) with built-in strategies to estimate the contribution of each variable to the prediction, the estimated measures of relative importance are scaled to the range between 0 (least important) and 100 (most important). Otherwise, the importance of each predictor is calculated individually using a filter approach as implemented in the caret R package.
Furthermore, the following criteria are also used to evaluate the importance of individual features and their redundancy in prediction. For regression, the ability of individual features to predict the response variable is calculated as the correlation coefficients (R2) between the predicted values and the actual values, which is termed as predictive power of the corresponding features. For classification problems, a greedy feature selection algorithm49 is conducted. Specifically, starting with the original set of n features, each feature is independently removed to produce n subsets of data with n − 1 features. Then the classification performance is computed with k-fold cross-validation and N-times randomizations, in the same way as described above, for each of these n subsets. The feature with least decreased the classification accuracy will be removed at this step. The above process is iterated until no feature can be removed. The classification performance driven by a specific combination of features can be visualized in a boxplot, with x-axis as the number of features and y-axis as cross-validation of classification accuracy.
The HTPmod web-based application is freely available at http://www.epiplant.hu-berlin.de/shiny/app/HTPmod/. Users are encouraged deploy the HTPmod application at their own web server. The corresponding source code is available at https://github.com/htpmod/HTPmod-shinyApp and online document is available at https://github.com/htpmod/HTPmod-shinyApp/wiki.
The processed example data sets used for demonstration purposes are provided alongside the HTPmod source code (https://github.com/htpmod/HTPmod-shinyApp).
Chen, D. et al. Dissecting the phenotypic components of crop plant growth and drought responses based on high-throughput image analysis. Plant Cell 26, 4636–4655 (2014).
Arend, D. et al. Quantitative monitoring of Arabidopsis thaliana growth and development using high-throughput plant phenotyping. Sci. Data 3, 160055 (2016).
Tsankov, A. M. et al. Transcription factor binding dynamics during human ES cell differentiation. Nature 518, 344–349 (2015).
Gerstein, M. B. et al. Comparative analysis of the transcriptome across distant species. Nature 512, 445–448 (2014).
Brown, J. B. et al. Diversity and dynamics of the Drosophila transcriptome. Nature 512, 393–399 (2014).
Kawakatsu, T. et al. Epigenomic diversity in a global collection of Arabidopsis thaliana accessions. Cell 166, 492–506 (2016).
Roadmap Epigenomics Consortium. et al. Integrative analysis of 111 reference human epigenomes. Nature 518, 317–329 (2015).
Neph, S. et al. An expansive human regulatory lexicon encoded in transcription factor footprints. Nature 489, 83–90 (2012).
Malley, R. C. O. et al. Cistrome and epicistrome features shape the regulatory DNA landscape. Cell 166, 1598 (2016).
Sullivan, A. M. et al. Mapping and dynamics of regulatory DNA and transcription factor networks in A. thaliana. Cell Rep. 8, 2015–2030 (2014).
Schadt, E. E., Linderman, M. D., Sorenson, J., Lee, L. & Nolan, G. P. Computational solutions to large-scale data management and analysis. Nat. Rev. Genet. 11, 647–657 (2010).
Tardieu, F., Cabrera-Bosquet, L., Pridmore, T. & Bennett, M. Plant phenomics, from sensors to knowledge. Curr. Biol. 27, R770–R783 (2017).
Houle, D., Govindaraju, D. R. & Omholt, S. Phenomics: the next challenge. Nat. Rev. Genet. 11, 855–866 (2010).
Angermueller, C., Pärnamaa, T., Parts, L. & Oliver, S. Deep learning for computational biology. Mol. Syst. Biol. 12, 1–16 (2016).
Singh, A., Ganapathysubramanian, B., Singh, A. K. & Sarkar, S. Machine learning for high-throughput stress phenotyping in plants. Trends Plant. Sci. 21, 110–124 (2016).
Karlic, R., Chung, H.-R., Lasserre, J., Vlahovicek, K. & Vingron, M. Histone modification levels are predictive for gene expression. Proc. Natl Acad. Sci. USA 107, 2926–2931 (2010).
Cheng, C. et al. A statistical framework for modeling gene expression using chromatin features and application to modENCODE datasets. Genome Biol. 12, R15 (2011).
Dong, X. et al. Modeling gene expression using chromatin features in various cellular contexts. Genome Biol. 13, R53 (2012).
Costa, I. G., Roider, H. G., do Rego, T. G. & de Carvalho, Fde A. Predicting gene expression in T cell differentiation from histone modifications and transcription factor binding affinities by linear mixture models. BMC Bioinforma. 12, S29 (2011).
Consortium, E. P. et al. An integrated encyclopedia of DNA elements in the human genome. Nature 489, 57–74 (2012).
Song, L. et al. A transcription factor hierarchy defines an environmental stress response network. Science (80-.). 354, aag1550–aag1550 (2016).
Schmidt, F. et al. Combining transcription factor binding affinities with open-chromatin data for accurate gene expression prediction. Nucleic Acids Res. 45, 54–66 (2017).
Ouyang, Z., Zhou, Q. & Wong, W. H. ChIP-Seq of transcription factors predicts absolute and differential gene expression in embryonic stem cells. Proc. Natl Acad. Sci. USA 106, 21521–21526 (2009).
Zhang, L.-Q., Li, Q.-Z., Su, W.-X. & Jin, W. Predicting gene expression level by the transcription factor binding signals in human embryonic stem cells. Biosystems 150, 92–98 (2016).
Chen, D. et al. Predicting plant biomass accumulation from image-derived parameters. Gigascience 7 (2018). https://doi.org/10.1093/gigascience/giy001
Smaczniak, C., Muiño, J. M., Chen, D., Angenent, G. C. & Kaufmann, K. Differences in DNA-binding specificity of floral homeotic protein complexes predict organ-specific target genes. Plant Cell 29, 1822–1835 (2017).
Fahlgren, N. et al. A versatile phenotyping system and analytics platform reveals diverse temporal responses to water availability in Setaria. Mol. Plant 8, 1520–1535 (2015).
Klukas, C., Chen, D. & Pape, J.-M. Integrated analysis platform: an open-source information system for high-throughput plant phenotyping. Plant Physiol. 165, 506–518 (2014).
Gehan, M. A. et al. PlantCVv2: Image analysis software for high-throughput plant phenotyping. PeerJ 5, e4088 (2017).
Cheng, C. et al. Understanding transcriptional regulation by integrative analysis of transcription factor binding data. Genome Res. 22, 1658–1667 (2012).
Yang, W. et al. Combining high-throughput phenotyping and genome-wide association studies to reveal natural genetic variation in rice. Nat. Commun. 5, 5087 (2014).
Baranowski, P. et al. Hyperspectral and thermal imaging of oilseed rape (Brassica napus) response to fungal species of the genus Alternaria. PLoS ONE 10, e0122913 (2015).
Maaten, L. VanDer & Hinton, G. Visualizing data using t-SNE. J. Mach. Learn. Res. 1, 267–284 (2008).
Chen, J. et al. Dynamic transcriptome landscape of maize embryo and endosperm development. Plant Physiol. 166, 252–264 (2014).
Terol, J., Tadeo, F., Ventimilla, D. & Talon, M. An RNA-Seq-based reference transcriptome for Citrus. Plant. Biotechnol. J. 14, 938–950 (2016).
Zhan, J. et al. RNA sequencing of laser-capture microdissected compartments of the maize kernel identifies regulatory modules associated with endosperm cell differentiation. Plant Cell 27, 513–531 (2015).
Wang, C. et al. Genome-wide analysis of local chromatin packing in Arabidopsis thaliana. Genome Res. 25, 246–256 (2015).
Chitwood, D. H., Maloof, J. N. & Sinha, N. R. Dynamic transcriptomic profiles between tomato and a wild relative reflect distinct developmental architectures. Plant Physiol. 162, 537–552 (2013).
Ranjan, A., Townsley, B. T., Ichihashi, Y., Sinha, N. R. & Chitwood, D. H. An intracellular transcriptomic atlas of the giant coenocyte Caulerpa taxifolia. PLoS Genet. 11, e1004900 (2015).
Ranjan, A. et al. De novo assembly and characterization of the transcriptome of the parasitic weed dodder identifies genes associated with plant parasitism. Plant Physiol. 166, 1186–1199 (2014).
Zhu, G. et al. Rewiring of the fruit metabolome in tomato breeding. Cell 172, 249–261 (2018). e12.
Jiao, Y. & Meyerowitz, E. M. Cell-type specific analysis of translating RNAs in developing flowers reveals new levels of control. Mol. Syst. Biol. 6, 419 (2010).
Tarca, A. L., Carey, V. J., Chen, X., Romero, R. & Drăghici, S. Machine learning and its applications to biology. PLoS Comput. Biol. 3, e116 (2007).
Ubbens, J. R. & Stavness, I. Deep plant phenomics: a deep learning platform for complex plant phenotyping tasks. Front. Plant Sci. 8, 1190 (2017).
Pound, M. P. et al. Deep machine learning provides state-of-the-art performance in image-based plant phenotyping. Gigascience 6, 1–10 (2017).
Pound, M. P., Atkinson, J. A., Wells, D. M., Pridmore, T. P. & French, A. P. Deep learning for multi-task plant phenotyping. bioRxiv 204552 (2017). https://doi.org/10.1101/204552
Saito, T. & Rehmsmeier, M. The precision-recall plot is more informative than the ROC plot when evaluating binary classifiers on imbalanced datasets. PLoS ONE 10, e0118432 (2015).
Fuchs, F. et al. Clustering phenotype populations by genome-wide RNAi and multiparametric imaging. Mol. Syst. Biol. 6, 370 (2010).
This work was partially supported by the Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), the National Natural Sciences Foundation of China (No. 31571366, 31771477), and the National Key Research and Development Program of China (2016YFA0501704). D.H. and M.C. are grateful to the support by the 111 Project and the Fundamental Research Funds for the Central Universities. K.K. wishes to thank the Alexander-von-Humboldt foundation and the Federal Ministry of Education and Research for support.
The authors declare no competing interests.
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Chen, D., Fu, LY., Hu, D. et al. The HTPmod Shiny application enables modeling and visualization of large-scale biological data. Commun Biol 1, 89 (2018). https://doi.org/10.1038/s42003-018-0091-x
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