Complexity Research in Nature Communications

This web collection showcases the potential of interdisciplinary complexity research by bringing together a selection of recent Nature Communications articles investigating complex systems. Complexity research aims to characterize and understand the behaviour and nature of systems made up of many interacting elements. Such efforts often require interdisciplinary collaboration and expertise from diverse schools of thought. Nature Communications publishes papers across a broad range of topics that span the physical and life sciences, making the journal an ideal home for interdisciplinary studies.

The Ecology and evolution section contains studies that explore the dynamics of networks of genes, individuals and communities using combinations of empirical data and mathematical tools. Other examples of computational modeling in biology include studies on precision medicine and molecular network dynamics, and these are highlighted in Network medicine tab. Neuroscience is another discipline that is effectively leveraging network analysis to better understand how the complex interactions between neuroanatomy and function give rise to equally complex human behaviors. Such behaviors, when combined, give rise to cultures and societies.  The latter are paradigmatic complex systems, and articles presented in the Social systems section examine these paradigmatic complex systems, describing the dynamics of social systems, financial systems and transport networks that affect much of our daily lives.  Finally, the collection under the Network structure and dynamics tab showcases methodological advances in complex system modeling and network analysis. The articles that we felt represented each section particularly well are also available in the Editors' picks section, below.  

Solving some of the most important problems in science may only be possible when scientists with different backgrounds collaborate to address shared questions using complementary techniques. Truly interdisciplinary research that can bridge the natural, physical and social sciences remains challenging, as it requires scientists to share and discuss their views across disciplines, and therefore such research must also be able to reach a diverse audience. Our collection, which has been chosen by editors across the broad spectrum of subjects covered by Nature Communications, has been put together with this specific goal in mind.  


Network medicine

Network dynamics-based cancer panel stratification for systemic prediction of anticancer drug response
Minsoo Choi et al., Nat. Commun. 8 1940 (2017) 

Genomic alterations underlie the variability of drug responses between cancers, but our mechanistic understanding is limited. Here the authors use the p53 network to study how rewiring of signalling networks by genomic alterations impact their dynamic response to pharmacological perturbation.



Percolation transition of cooperative mutational effects in colorectal tumorigenesis 
Dongkwan Shin et al., Nat. Commun. 8 1270 (2017) 

Cancer is caused by accumulating genetic mutations, but their global interactions are poorly understood. Here, the authors investigate the cooperative effect of these mutations in colorectal cancer patients and identify a giant cluster of mutation-propagating modules that undergoes percolation transition from small, scattered modules to a large connected cluster during tumourigenesis.

Control of primary metabolism by a virulance regulatory network promotes robustness in a plant pathogen
Rémi Peyraud et al., Nat. Commun. 9 418 (2018)

How pathogens maintain phenotypic robustness during infection is poorly understood. Here the authors couple the virulence regulatory network (VRN) of the plant pathogen R. solanacearum to a model of its metabolic network, and find that the VRN activates functionally redundant primary metabolism genes to promote phenotypic robustness during infection. 


A network integration approach for drug-target interaction prediction and computational drug repositioning from heterogeneous information 
Yunan Luo et al., Nat. Commun. 8 573 (2017)

Network-based data integration for drug-target prediction is a promising avenue for drug repositioning, but performance is wanting. Here, the authors introduce DTINet, whose performance is enhanced in the face of noisy, incomplete and high-dimensional biological data by learning low-dimensional vector representations.

Network-based in silico drug efficacy screening
Emre Guney et al.Nat. Commun. 7 10331 (2016)

Interaction of a drug with its target protein initiates a perturbation that cascades through the interactome, but this systemic effect is rarely considered in attempts of predicting novel uses of drugs. Here, the authors introduce a measure of drug-disease proximity on the interactome, enabling drug efficacy prediction based on the distance of a drug’s target from the neighborhood in the network that is perturbed in each disease.

Centrality in the host–pathogen interactome is associated with pathogen fitness during infection
Núria Crua Asensio et al., Nat Commun. 8, 14092 (2017)

Highly connected nodes in protein-protein interaction networks play essential roles in organismal function. Here, the authors show that it is the proteins with high centrality in the interface of the Y. pestis interacome and that of its host, rather than the pathogen's own protein network, that are most important for pathogen fitness during infection, and highlight the importance of pathogen proteins that likely cause significant perturbation of the interactome of the host.

Reconciled rat and human metabolic networks for comparative toxicogenomics and biomarker predictions
Edik M. Blais et al., Nat. Commun. 8 14250 (2017)

The rat is a widely used model for human biology, but we must be aware of metabolic differences to judge when it is a good one. Here, the authors reconstruct the genome-scale metabolic network of the rat and reconcile it with an improved human metabolic model. The power of the models to integrate toxicogenomics data is demonstrated by providing species-specific biomarker predictions in response to a panel of drugs.


A geometrical approach to control and controllability of nonlinear dynamical networks
Le-Zhi Wang et al., Nat. Commun. 7 11323 (2016)

Complex networks with nonlinear dynamics and multiple stable states, including physical, biological and social systems are ubiquitous, and our ability to control them crucially depends on understanding of how perturbations affects their global dynamics. Here, Wang et al. develop a framework based on the concept of attractor networks to quantify and facilitate the study of controllability of nonlinear dynamics in complex systems. The utility of the framework is demonstrated by finding perturbations that could drive cancerous cell states back to normal states.


Topological data analysis for discovery in preclinical spinal cord injury and traumatic brain injury
Jessica L. Nielson et al., Nat. Commun. 6 8581 (2015)

Precision medicine, particularly for complex neurological disorders, can be enhanced by using data-driven discovery to extract meaningful knowledge from large, heterogeneous datasets. Here, the authors apply a big-data analytical approach known as Topological Data Analysis (TDA) to assess therapeutic effects in preclinical traumatic brain injury and spinal cord injury research studies. With this approach, they identify novel symptomatic patterns, detrimental drug effects, and predict long-term recovery.