VI. Earth Life Emergence: Development of Body, Brain, Selves and Societies
A. A Survey of Common Principles
Koonin, Eugene. Are There Laws of Genome Evolution? PLoS Computational Biology. 7/8, 2011. As now broadly evident, as documented herein, life from cosmos to cities seems to be graced by repetitive, similar nonlinear patterns and processes in manifest effect everywhere. A NIH bioinformatician, geneticist, and author, ponders whether this ubiquitous presence, as apparent in cellular protoplasm, would in fact imply and arise from a realm of independent natural principles. In lieu of more review, the gist of these insights is well conveyed by extended excerpts. See also Koonin’s new book The Logic of Chance: The Nature and Origin of Biological Evolution (Financial Times Press, 2011).
Research in quantitative evolutionary genomics and systems biology led to the discovery of several universal regularities connecting genomic and molecular phenomic variables. These universals include the log-normal distribution of the evolutionary rates of orthologous genes; the power law–like distributions of paralogous family size and node degree in various biological networks; the negative correlation between a gene's sequence evolution rate and expression level; and differential scaling of functional classes of genes with genome size. The universals of genome evolution can be accounted for by simple mathematical models similar to those used in statistical physics…. These models do not explicitly incorporate selection; therefore, the observed universal regularities do not appear to be shaped by selection but rather are emergent properties of gene ensembles. (Abstract, 1)
Kovacs, Istvan, et al. Community Landscapes: An Integrative Approach to Determine Overlapping Network Module Hierarchy, Identify Key Nodes and Predict Network Dynamics. PLoS One. 5/9, 2010. In this 100 page entry with bioinformatic programs and references, Semmelweis University, Budapest, living system scientists, including Peter Csermely, parse modular networks to uncover a ubiquitous topological feature. Indeed, nature seems intent on forming communal groupings of an appropriate size and populace at each and every strata and instance. Might one even broach an “ubuntu Universe.”
Background: Network communities help the functional organization and evolution of complex networks. However, the development of a method, which is both fast and accurate, provides modular overlaps and partitions of a heterogeneous network, has proven to be rather difficult. Methodology/Principal Findings: Here we introduce the novel concept of ModuLand, an integrative method family determining overlapping network modules as hills of an influence function-based, centrality-type community landscape, and including several widely used modularization methods as special cases. As various adaptations of the method family, we developed several algorithms, which provide an efficient analysis of weighted and directed networks, and (1) determine pervasively overlapping modules with high resolution; (2) uncover a detailed hierarchical network structure allowing an efficient, zoom-in analysis of large networks; (3) allow the determination of key network nodes and (4) help to predict network dynamics.
Labra, Fabio, et al. Scaling Metabolic Rate Fluctuations. Proceedings of the National Academy of Sciences. 104/10900, 2007. Another example of an international collaboration from Chile and the United States, which again reports general principles and topologies, in this case for metabolism dynamics, that hold across 71 individual types from 25 vertebrate species including reptiles, birds, and mammals. Once more deep in the primary literature, a cerebral humankind goes on to describe and discover an organic natural genesis graced by the same recurrent phenomena at each stage and instance.
Complex ecological and economic systems show fluctuations in macroscopic quantities such as exchange rates, size of companies or populations that follow non-Gaussian tent-shaped probability distributions of growth rates with power-law decay, which suggests that fluctuations in complex systems may be governed by universal mechanisms, independent of particular details and idiosyncrasies. We propose here that metabolic rate with individual organisms may be considered as an example of an emergent property of a complex system and test the hypothesis that the probability distribution of fluctuations in the metabolic rate of individuals has a “universal” form regardless of body size or taxonomic affiliation. (10900)
Laurienti, Paul, et al. Universal Fractal Scaling of Self-Organized Networks. Physica A. 390/20, 2011. After some two decades of complex systems studies from every angle, in disparate fields and terms, on every continent, a maturity is lately being reached so it is possible, for example, for this team of Wake Forest University biomedical researchers to propose a natural “universality” of “node and interaction” dynamic network phenomena. To wit, the same fractal pattern and process faithfully recurs across broad Biological, Information, Social, and Technological domains. These extended quotes might portend, circa 2011, a new animate nature suffused with intrinsic creativities that repeat and reiterate across every regnant realm. At what point, and by what insight, might this realization become a revolution, and its spontaneity be appreciated as genetic in kind?
There is an abundance of literature on complex networks describing a variety of relationships among units in social, biological, and technological systems. Such networks, consisting of interconnected nodes, are often self-organized, naturally emerging without any overarching designs on topological structure yet enabling efficient interactions among nodes. Here we show that the number of nodes and the density of connections in such self-organized networks exhibit a power law relationship. We examined the size and connection density of 47 self-organizing networks of various biological, social, and technological origins, and found that the size-density relationship follows a fractal relationship spanning over 6 orders of magnitude. This finding indicates that there is an optimal connection density in self-organized networks following fractal scaling regardless of their sizes. (Abstract, 1)
Letsou, William and Long Cai. Noncommutative Biology: Sequential Regulation of Complex Networks. PLoS Computational Biology. Online August, 2016. CalTech biochemists first describe an apparently constant recurrence in genomes of a common network dynamics and geometry. With this iconic system in place, its similar presence can be noted in many other, far removed natural and social realms.
DNA is the blueprint of life. Yet the order in which a cell follows these instructions makes it capable of generating thousands of different fates. How this information is extracted from underlying gene regulatory networks is unclear, especially given that biological networks are highly interconnected, and that the number of signaling pathways is relatively small. The conventional approach for increasing the information capacity of a limited set of regulators is to use them in combination. Surprisingly, combinatorial logic does not increase the diversity of target configurations or cell fates, but instead causes information bottlenecks. A different approach, called sequential logic, uses noncommutative sequences of a small set of regulators to drive networks to a large number of novel configurations. In this paper we show how sequential logic outperforms combinatorial logic, and argue that noncommutative sequences underlie a number of cases of biological regulation, e.g. how a small number of signaling pathways generates a large diversity of cell types in development. (Summary)
Complex Adaptive Systems.
Bulletin of the American Mathematical Society.
The article lays out guidelines by which to study the evolving biosphere in terms of its nonlinear properties of many autonomous agents, diversity, resiliency, localized interactions, cooperation, pattern emergence and so on.
The notion of complex adaptive systems has found expression in every from cells to societies, in general with reference to the self-organization of complex entities, across scales of space, time and organizational complexity. (3)
Levin, Simon. The Evolution of Ecology. The Chronicle Review. August 13, 2010. The Princeton ecologist notes how this environmental science, since a systems view was necessary from its inception, has grown to be an exemplary model for studies across the ranges of nature and society.
Ecology views biological systems as wholes, not as independent parts, while seeking to elucidate how the wholes emerge from and affect the parts. Increasingly, such a holistic perspective, rechristened at places like the Santa Fe Institute as "the theory of complex adaptive systems," has informed understanding and improved management of economic and financial systems, social systems, complex materials, and even physiology and medicine. Essentially, that means little more than taking an ecological approach to such systems. (13)
Locey, Ken and Jay Lennon. Scaling Laws Predict Global Microbial Diversity. Proceedings of the National Academy of Sciences. 113/5970, 2016. Indiana University biologists attest to the natural presence of a consistent mathematical organization across a widest range of bacterial entities and colonies.
Ecological scaling laws are intensively studied for their predictive power and universal nature but often fail to unify biodiversity across domains of life. Using a global-scale compilation of microbial and macrobial data, we uncover relationships of commonness and rarity that scale with abundance at similar rates for microorganisms and macroscopic plants and animals. We then show a unified scaling law that predicts the abundance of dominant species across 30 orders of magnitude to the scale of all microorganisms on Earth. Using this scaling law combined with the lognormal model of biodiversity, we predict that Earth is home to as many as 1 trillion (1012) microbial species. (Significance)
Luque, Jordi, et al. Speech Earthquakes: Scaling and Universality in Human Voice. arXiv:1408.0985. We cite this report by Spanish and British researchers as a good example of current discoveries of how the same generic patterns and processes recur across the widest domains from peoples to the planet. As the quote describes, disparate phenomena such as conversation and seismic events are yet found to exemplify and repeat in kind everywhere, which quite implies a universal, independent, mathematical source.
Speech is a distinctive complex feature of human capabilities. In order to understand the physics underlying speech production, in this work we empirically analyse the statistics of large human speech datasets ranging several languages. We first show that during speech the energy is unevenly released and power-law distributed, reporting a universal robust Gutenberg-Richter-like law in speech. We further show that such earthquakes in speech show temporal correlations, as the interevent statistics are again power-law distributed. Since this feature takes place in the intra-phoneme range, we conjecture that the responsible for this complex phenomenon is not cognitive, but it resides on the physiological speech production mechanism.
Magliocca, Nicholas, et al. Modeling Cocaine Traffickers and Counterdrug Interdiction Forces as a Complex Adaptive System. Proceedings of the National Academy of Sciences. Early online April 1, 2019. Eight systems geographers posted in Alabama, Arizona, Wyoming, Texas, Oregon, and Ohio identify a common mathematical patterning that even criminal chaos seems to hold to and be constrained by. Our interest extends to a concurrent paper, Structure, Spatial Dynamics of Novel Seed Dispersal Mutualistic Networks in Hawaii (Visentin herein), which notes similar structuring dynamics across ecosystems. Within our 21st century scan, it is increasingly evident to a point of proof and discovery that an independent generative source is in exemplary presence everywhere.
The US government’s cocaine interdiction mission in the transit zone of Central America is now in its fifth decade despite its long-demonstrated ineffectiveness, both in cost and results. We developed a model that builds an interdisciplinary understanding of the structure and function of narco-trafficking networks and their coevolution with interdiction efforts as a complex adaptive system. The model produced realistic predictions of where and when narco-traffickers move in and around Central America in response to interdiction. The model demonstrated that narco-trafficking is as widespread and difficult to eradicate as it is because of interdiction, and increased interdiction will continue to spread traffickers into new areas, allowing them to continue to move drugs north. (Significance)
Makarieva, Anastassia, et al. Mean Mass-Specific Metabolic Rates are Strikingly Similar Across Life's Major Domains: Evidence for Life's Metabolic Optimum. Proceedings of the National Academy of Sciences. 105/16004, 2008. An international research team finds, as the quotes aver, a consistent, universal repetition across all spatial and evolutionary natural taxa. From our late global vantage might it seem in retrospect the entirety of earth life appears as a single developing organism?
A fundamental but unanswered biological question asks how much energy, on average, Earth's different life forms spend per unit mass per unit time to remain alive. Here, using the largest database to date, for 3,006 species that includes most of the range of biological diversity on the planet—from bacteria to elephants, and algae to sapling trees—we show that metabolism displays a striking degree of homeostasis across all of life. We demonstrate that, despite the enormous biochemical, physiological, and ecological differences between the surveyed species that vary over 1020-fold in body mass, mean metabolic rates of major taxonomic groups displayed at physiological rest converge on a narrow range from 0.3 to 9 W kg−1. (16994)
Marcus, Gary. Startling Starlings. Nature. 440/1117, 2006. A review of a research article in the same issue by Timothy Gentner, et al: Recursive Syntactic Pattern Learning by Songbirds. Recursion, or hierarchical self-embedding, was long thought to distinguish human language. In this study, the nested building-up of intricate communication is found to also occur in avian species. And the universally recurrent, code-like, pattern of emergence appears again in regnant speech.