Systems Biology: mathematical modeling of immune response to pathogens (mathematical modeling of Mycobacterium tuberculosis) and host-microbiome interactions. Infection data are are from human, primate and mouse.
Mathematics: representing cell populations dynamics and interaction by various mathematical modeling techniques, e.g. deterministic Ordinary Differential Equation (ODE) and Delay Diffferential Equation (DDE) systems, as well as Stochastic models (Agent Based Models– ABM)).
Statistics: Parameter estimation and statistical techniques for uncertainty and sensitivity analysys in complex mathematical models (for example, statistical and computational techniques are used to model the effect of antigen dose on the early events in the immune response during Mycobacterium tuberculosis infection).
›› WHO I AM
• University of Rome I "La Sapienza", Rome, Italy. B.S. and M.S. (1997). Applied Statistics
• Ph.D.. University of Rome I "La Sapienza", Rome, Italy. 2002. Operations Research. Mentor: Angrea De Gaetano, MD PhD
• Postdoctoral Fellowship. University of Michigan Medical School, Dept. Microbiology and Immunology, Ann Arbor, MI. 2002-2005. Biomathematics. Mentor: Denise Kirschner PhD
• Postdoctoral Fellowship. Medical University of South Carolina, Charleston, SC. 2004. Bioinformatics. Mentor: Eberhard Voit PhD
• Feb-June 2004, Postdoctoral Fellow, Biostatistics, Bioinformatics and Epidemiology, MUSC, Charleston, SC
• 2002-2005, Research Fellow, Microbiology and Immunology, University of Michigan, Ann Arbor, MI
• Jan-July 2005, Research Faculty, The Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University, Atlanta, GA
• July 2005-2010, Research Investigator, Microbiology and Immunology, University of Michigan, Ann Arbor, MI • Sept 2010-present, Research Assistant Scientist, Microbiology and Immunology, University of Michigan, Ann Arbor, MI
I am a Research Assistant Scientist in the Department of Microbiology and Immunology at the University of Michigan Medical School in Ann Arbor, Michigan. Rome (Italy) is my beloved hometown, where I was born on June the 1st 1970. I spent 3/4 of my life there and then in 2001 I decided to move to the United States to pursue my dreams and do science. I have a unique multi-disciplinary background, spanning from statistics and probability, to operations research, mathematics and systems biology. I have always tried to combine all these assets and skills throughout my research career, starting from my PhD thesis.
I got both a MS in Statistics (May 1997) and a PhD in Operations Research (Dec 2001) at the University of Rome "La Sapienza", Dept. of Statistic, Probability and Applied Statistic). I got my PhD in Operations Research at the Biomathematics Laboratory of the National Research Council, in Rome: it is located in the "Gemelli" area, which comprises the hospital (it's the hospital of the Pope), the university and many research facilities and institutions.
My PhD dissertation was based on parameter estimation of Ordinary Differential Equations (ODEs) systems by Least Squares (LS) approach and nonlinear programming algorithms. It merges both statistics and operations research, as well as biomathematics: in fact the mathematical models implemented in my PhD are related to glucose-insulin and lipids dynamics, including many simulations of growth and decay curves (Gompertz, Logistic, ....). Since then, I have been interested in biology and fascinated by immunology, which to me represents the perfect example of a continuously evolving complex system. Since then, I also proudly call myself a systems biologist.
I moved to Ann Arbor in July 2001 as a Research Fellow in Denise Kirschner lab, where I studied immunology for the first time in my life. Denise opened my mind to the wonderful world of immune system: it looked, and still looks, like sci fi to me. It's really amazing. My main research was on building mathematical models of the many faces of immune response to Mycobacterium tuberculosis infection in human.
Why TB? Well, my grandfather died of tuberculosis and I found out that the TB global burden is still enormous today: TB is the world's leading cause of death in humans from a single infectious agent, with a newly infected individual every second and approximately 35 deaths every 10 minutes (~2 million a year). I also realized that mathematical and computational modeling approaches can provide a unique opportunity to identify factors that are crucial to a successful outcome of infection in humans. These modeling tools not only offer an additional avenue for exploring immune dynamics at multiple biological scales, but also complement and extend knowledge gained via experimental tools. This gave me extra motivation and my research since then and for the past 10 years has mainly focused on questions related to host-pathogen interactions in infectious diseases, with a specific interest in the host immune response to Mtb at multiple spatial and time scales. All of these studies have been funded by the National Institutes of Health, through grants awarded to Dr. Kirschner, with myself as co-PI.
I moved to the Department of Biostatistics, Bioinformatics and Epidemiology at MUSC (Charleston, SC) for a short time in 2004, and later I joined the Department of Biomedical Engineering at Georgia Tech and Emory University in Atlanta. In both departments, I worked as a Research Scientist with Eberhard Voit on metabolic pathway network discovery (based on S-Systems approach, power-law formalism and biochemical system theory), applying algorhytms developed during my PhD years. I used non linear least squares as data fitting scheme for extracting structural information from time series of metabolite concentrations, or of gene or protein expression profiles. Biochemical system theory (BST) is the theoretical modeling framework, but the approach can be applied to general nonlinear systems of differential equations.
I then moved back to Ann Arbor in July 2005 as a faculty (Research Investigator) and now has a Assistant Research Scientist.
Based on the work with Eberhard Voit, I have recently devoted part of my research efforts on algorithms for data-driven model generation, fitting and selection (GFS algorithm, i.e., network inference) of gut microbiome data. I am currently working as a co-PI with Dr. Pat Schloss here at the University of Michigan (NIH RO1 grant funded) on Operational Taxonomic Units (OTU) microbiome data. The goal of this research project is to develop a dynamical model (ODE) that identifies, quantifies and predicts the overall architecture and dynamics of mice OTU data (relative abundance of microbial communities). This work will set the foundations for a more systematic and comprehensive study of host-microbiome interactions, where the effects of antibiotics is investigated in the context of microbiome diversity and stability, as well as susceptibility to bacterial (for example Clostridium difficile infection-, or CDI) or viral infections
UNCERTAINTY AND SENSITIVITY ANALYSIS
a recurring central theme across all these modeling efforts is to choose how to perform network inference, parameter estimation and model validation. Accurate estimation of model parameters and ultimately the strength and quality of model predictions are challenged by an intrinsic biological and experimental variability in rates measured from in vivo or in vitro studies, where some interactions in the systems are not even currently measurable. As system biologists, we quantify the importance of each host mechanism involved directly and indirectly in the infection dynamics using statistical techniques known as uncertainty and sensitivity analyses. I recently published a highly cited review in Journal of Theoretical Biology which represents the first systematic study on uncertainty and sensitivity analyses techniques, focused on systems biology applications. Statistical sampling techniques (uncertainty) and generalized correlation indexes and variance decomposition methods (sensitivity) when combined guide our understanding as to how and what extent variability in parameter values affects infection outcomes. This approach can be used in a variety of mathematical and computational model settings and should be a necessary step for model validation, in any field, and especially needed in systems biology and complex systems. Some of these techniques are explicitly developed for deterministic models. However, we showed how they can be extended to stochastic models, such as agent-based models. Moreover, large complex systems can use uncertainty and sensitivity analyses techniques as a viable alternative for model fitting. A similar challenge is to apply classical model fitting approaches to ABM systems, where not only time courses need to be matched, but also shapes and patterns emerging from the model simulations.
I plan to address most of the above questions in my future research.
›› List of publications
Bartolozzi F., De Gaetano A., Di Lena E. ,Marino S. , Nieddu L., Patrizi G., Operational Research Techniques in Medical Treatment and Diagnosis: a Review, European Journal of Operations Research, 121, 2000: pp. 435-466
Mingrone G., Marino S., De Gaetano A. et al., Different Limit to the Body's Ability of Increasing Fat-Free Mass, , Metabolism, 50 (9), Sept 2001: pp. 1004-1007
Marino Simeone, De Gaetano Andrea et al., Computing DIT from energy expenditure measures in a respiratory chamber: a direct modeling method, Computers in Biology and Medicine, 32 (4), May 2002
Simeone Marino, Suman Ganguli, Ian M. P. Joseph, Denise E. Kirschner, The Importance of an Inter-compartmental Delay in a Model for Human Gastric Acid Secretion, Bulletin of Math Biology, Nov 2003, Vol 65/6 pp 963-990.
Simeone Marino and Denise E. Kirschner, The Human Immune Response to Mycobacterium tuberculosis in Lung and Lymph Node, Journal of Theoretical Biology, 21 April 2004, Volume 227, Issue 4, Pages 451-602.
Simeone Marino, Santosh Pawar, Craig L. Fuller, Todd A. Reinhart, JoAnne L. Flynn and Denise E. Kirschner, Dendritic Cell Trafficking and Antigen Presentation in the Human Immune Response to Mycobacterium tuberculosis, Journal of Immunology, 2004, 173: 494-506.
Voit EO, Marino S, Lall R. Challenges for the identification of biological systems from in vivo time series data., In Silico Biol. 2005;5(2):83-92.
David Gammack, Suman Ganguli, Simeone Marino, Jose Segovia-Juarez, Denise E. Kirschner, Understanding the Immune Response in Tuberculosis Using Different Mathematical Models and Biological Scales, (2005) Multiscale Modeling and Simulation: A SIAM Interdisciplinary Journal, 3 (2), pp. 312-345
Kirschner D. and Marino Simeone. Mycobacterium tuberculosis as viewed through a computer. Trends Microbiol. 2005 May;13(5):206-11. Review.
Voit EO, Almeida J, Marino S, Lall R, Goel G, Neves AR, Santos H. Regulation of glycolysis in Lactococcus lactis: an unfinished systems biological case study. Syst Biol (Stevenage). 2006 Jul;153(4):286-98.
Marino S, Voit EO. An automated procedure for the extraction of metabolic network information from time series data. J Bioinform Comput Biol. 2006 Jun;4(3):665-91.
E. Beretta, M. Carletti, D. Kirschner and Marino S., Stability analysis of a mathematical model of immune response with delays. Springer Book Vol. 2: Mathematics for Life Science and Medicine, eds. Takeuchi, Sato and Iwasa, Chapter 8, pp. 177-206 (2006).
S. Marino, E. Beretta and D. E. Kirschner. The role of delays in innate and adaptive immunity to intracellular bacterial infection. Math. Biosc. Eng. 4(2), 2007 pp. 261-286.
Marino, S., Sud, D., Plessner, H., Lin PL, Chan J., Flynn, JL, Kirschner, D. Differences in reactivation of tuberculosis induced from anti-TNF treatments are based on bioavailability in granulomatous tissue .PLOS Computational Biology. Vol. 3 (10) e194. pp. 1909-24. Oct 2007.
Chakravarty, S. D., Zhu, G., Tsai, M. C., Mohan, V. P., Marino, S., Kirschner, D. E., Huang, L., Flynn, J. and Chan, J. (2008). Tumor necrosis factor blockade in chronic murine tuberculosis enhances granulomatous inflammation and disorganizes granulomas in the lungs. Infect Immun 76(3), 916-26.
Marino, S., Hogue, I. B., Ray, C. J. & Kirschner, D. E. (2008). A methodology for performing global uncertainty and sensitivity analysis in systems biology. J Theor Biol 254(1), 178-96.
Amy L. Bauer, Ian B. Hogue, Simeone Marino and Denise E. Kirschner. The Effects of HIV-1 Infection on Latent Tuberculosis. Mathematical Modelling of Natural Phenomena, Vol. 3 No. 7 (2008): 229.
Roshan D'Souza, Mikola Lysenko, Simeone Marino and Denise Kirschner. Data-parallel algorithms for agent-based model simulations of tuberculosis on graphics processing units. Accepted in the Proceedings of SpringSim'09 - Agent-Directed Simulation (ADS09). San Diego San Diego, CA, March 22 - 27, 2009.
Soumya D. Chakravarty, Guofeng Zhu, Ming C. Tsai, Vellore P. Mohan, Simeone Marino,Denise E. Kirschner, Bor Huang, JoAnne Flynn and John Chan. Tumor Necrosis Factor Blockade in Chronic Murine Tuberculosis Leads to Granuloma Disorganization and Enhanced Pulmonary Inflammation, Infect Immun. 76(3):916-26, 2009
Jennifer J. Linderman, Thomas Riggs, Manjusha Pande, Simeone Marino and Denise E. Kirschner, Characterizing the dynamics of CD4+ T cell priming within a lymph node. Journal of Immunology 2010, 184: pp 2873-2885
R. Lall, T. J. Donohue, S. Marino and J. C. Mitchell. Optimizing Ethanol Production Selectivity. Mathematical and Computer Modeling, (2010),doi:10.1016/j.mcm.2010.01.016. 4
Simeone Marino, Amy Myers, JoAnne Flynn and Denise Kirschner, TNF and IL-10 are major factors in modulation of the phagocytic cell environment in lung and lymph node in tuberculosis: a next generation two compartmental model, Journal of Theoretical Biology, 265 (2010) 586–598
Simeone Marino, Jennifer Linderman, Denise E. Kirschner. A Multi-Faceted Approach to Modeling the immune response in Tuberculosis WIRES Systems Biology and Medicine 2011, Volume 3, Issue 4, pp. 479-489, July/August, PMID: 21197656, PMCID: 3110521
R. Lall, T. J. Donohue, S. Marino and J. C. Mitchell. Optimizing Ethanol Production Selectivity. Mathematical and Computer Modeling, 53: pp. 1363-1373, 2011.
Fallahi-Sichani, M., El-Kebir, M., Marino, S., Kirschner, D.E., and Linderman, J.J., 2011. Multiscale computational modeling reveals a critical role for TNF-alpha receptor 1 dynamics in tuberculosis granuloma formation. J Immunol 186, 3472-83.
Marino S., Mohammed El-Kebir, Denise Kirschner. 2011. A hybrid multi-compartment model of granuloma formation and T cell priming in Tuberculosis. J Theor Biol 280:50-62
Mohammad Fallahi-Sichani, Simeone Marino, JoAnne L. Flynn, Jennifer J. Linderman, Denise E. Kirschner. 2012. A systems biology approach for understanding granuloma formation and function in tuberculosis. In: Systems Biology of Tuberculosis. Ed's. Johnjoe McFadden, Dany Beste and Andrzej Kierzek Springer (NY) in press
Marino, S, Fallahi-Sichani, M, Linderman, J and Kirschner, D. 2012. Mathematical Models of anti-TNF therapies and their correlation with Tuberculosis In Antibody-mediated Drug Delivery Systems: Concepts, Technology and Applications, Y. Pathak and S. Benita, eds., John Wiley and Sons, Inc., 2012, Hoboken, New Jersey, 83-104, Published Online: 23 APR 2012, DOI: 10.1002/9781118229019.ch5, PMID: (exempt), PMCID: (exempt).
›› My updated CV
›› CONTACT ME
If you want to share some thoughts, drop me a line at firstname.lastname@example.org .
If we knew what it was we were doing, it would not be called research, would it?