Critical Dynamics in Genetic Regulatory Networks: Examples from Four Kingdoms

@article{citeulike:2906901, abstract = {The coordinated expression of the different genes in an organism is essential to sustain functionality under the random external perturbations to which the organism might be subjected. To cope with such external variability, the global dynamics of the genetic network must possess two central properties. (a) It must be robust enough as to guarantee stability under a broad range of external conditions, and (b) it must be flexible enough to recognize and integrate specific external signals that may help the organism to change and adapt to different environments. This compromise between robustness and adaptability has been observed in dynamical systems operating at the brink of a phase transition between order and chaos. Such systems are termed critical. Thus, criticality, a precise, measurable, and well characterized property of dynamical systems, makes it possible for robustness and adaptability to coexist in living organisms. In this work we investigate the dynamical properties of the gene transcription networks reported for S. cerevisiae, E. coli, and B. subtilis, as well as the network of segment polarity genes of D. melanogaster, and the network of flower development of A. thaliana. We use hundreds of microarray experiments to infer the nature of the regulatory interactions among genes, and implement these data into the Boolean models of the genetic networks. Our results show that, to the best of the current experimental data available, the five networks under study indeed operate close to criticality. The generality of this result suggests that criticality at the genetic level might constitute a fundamental evolutionary mechanism that generates the great diversity of dynamically robust living forms that we observe around us.}, author = {Balleza, Enrique and Alvarez-Buylla, Elena R. and Chaos, Alvaro and Kauffman, Stuart and Shmulevich, Ilya and Aldana, Maximino }, citeulike-article-id = {2906901}, doi = {http://dx.doi.org/10.1371/journal.pone.0002456}, journal = {PLoS ONE}, keywords = {boolean, grn, network, random}, month = {June}, number = {6}, pages = {e2456+}, posted-at = {2008-06-27 16:27:22}, priority = {1}, publisher = {Public Library of Science}, title = {Critical Dynamics in Genetic Regulatory Networks: Examples from Four Kingdoms}, url = {http://dx.doi.org/10.1371/journal.pone.0002456}, volume = {3}, year = {2008} }

TY - JOUR ID - citeulike:2906901 L3 - citeulike-article-id:2906901 TI - Critical Dynamics in Genetic Regulatory Networks: Examples from Four Kingdoms JF - PLoS ONE VL - 3 IS - 6 SP - e2456 PB - Public Library of Science N2 - The coordinated expression of the different genes in an organism is essential to sustain functionality under the random external perturbations to which the organism might be subjected. To cope with such external variability, the global dynamics of the genetic network must possess two central properties. (a) It must be robust enough as to guarantee stability under a broad range of external conditions, and (b) it must be flexible enough to recognize and integrate specific external signals that may help the organism to change and adapt to different environments. This compromise between robustness and adaptability has been observed in dynamical systems operating at the brink of a phase transition between order and chaos. Such systems are termed critical. Thus, criticality, a precise, measurable, and well characterized property of dynamical systems, makes it possible for robustness and adaptability to coexist in living organisms. In this work we investigate the dynamical properties of the gene transcription networks reported for S. cerevisiae, E. coli, and B. subtilis, as well as the network of segment polarity genes of D. melanogaster, and the network of flower development of A. thaliana. We use hundreds of microarray experiments to infer the nature of the regulatory interactions among genes, and implement these data into the Boolean models of the genetic networks. Our results show that, to the best of the current experimental data available, the five networks under study indeed operate close to criticality. The generality of this result suggests that criticality at the genetic level might constitute a fundamental evolutionary mechanism that generates the great diversity of dynamically robust living forms that we observe around us. KW - boolean KW - grn KW - network KW - random AU - Balleza, Enrique AU - Alvarez-Buylla, Elena AU - Chaos, Alvaro AU - Kauffman, Stuart AU - Shmulevich, Ilya AU - Aldana, Maximino PY - 2008/06/18/ UR - http://dx.doi.org/10.1371/journal.pone.0002456 ER -