We are interested in uncovering the unifying principles in complex biological systems. We like asking questions and look for simplest ways to answer them.
We combine theoretical and computational models with quantitative experiments (primarily time-lapse). We enjoy interacting with our collaborators across physics, biology and medicine.
Our current focus is on what can cells achieve collectively, how far can they go beyond what single cells can do on their own. A few examples are: ways to counteract stresses, balance their relative abundances in developing organs; encode and send the information across tissue and form complex and stable shapes in organs and organisms.
Life is a collection of processes on many different scales: milliseconds to centuries, nanometers to kilometers. As our capacity for information processing is finite we naturally zoom in and out between these scales to build a mental model of the world:
We pick up a few key elements and coarse-grain the details. In our group we use a similar approach of a coarse-grained modeling to capture complex biological phenomena.
The focus of our research is on identifying common principles in stress responses and development (in collaboration with StemPhys).
We find that the models at a right level of description reveal similarities across systems and organisms. These show up when we study:
- How receptor adaptation is encoded by networks that contain at least one of the two core circtuits
- How excitable dynamics can explain how the same proteins can encode opposing cell fates: life-death decisions and p53 dynamics in single cells; acute vs. chronic inflammation and IL-1/TNF/NF-kB dynamics in cell populations.
- How asymmetric damage segregation is a population strategy to rapidly adapt to stresses
- How right proportions are maintained during embryonic stem cell and pancreas differentiation
- How cellular polarities play together to form complex shapes (tubes and folds) in organs and organisms.
Stem cell differentiation
How do cells communicate and coordinate their fates to arrive at right proportions of differentiated cell types? How flexible/reversible are the transitions between differentiation states? Are there common principles (despite different set of proteins) at different differentiation stages and across organs?
We address these questions in collaboration with Joshua Brickmann (ES cells, early blastocyst) and Anne Grapin-Botton (pancreas) labs theoretically by in-silico models and experimentally by quantitative single-cell imaging and rna and protein profiling.
We strive to quantitatively understand the logic behind stress responses and how it unfolds itself in time and across cells in the tissue. What mechanisms did cells and organisms evolve to deal with the insults that perturb their normal function (stresses)?
What are the differences and similarities between the stress responses? (Both at the level of regulatory network and the dynamics of its components in single cells and on a cell-population level).With this knowledge and with the help of mathematical modeling the hope is to outline the "core circuits" that govern a given process. For this approach we employ a variety of theoretical tools complemented with experimental techniques (e.g. time-lapse of fluorescently tagged proteins in single cells) whenever possible.
We use agent based modeling to capture the possible mechanisms of species coexistence, epidemics and concurrent immunity spread of multiple competing diseases, or to explore the role of bacterial immunity (CRISPR) in phage-bacteria ecosystem. We have also developed a number of tools to analyze complex networks from an informaton perspecitve.
Species coexistence and bacterial immunity (CRISPR)
Targeted bacterial immunity buffres phage diversity. / Härter, Jan Olaf Mirko; Trusina, Ala; Sneppen, Kim.In: Journal of Virology, Vol. 85, No. 20, 21.08.2011, p. 10554-10560.
Ecosystems with Mutually Exclusive Interactions Self-Organize to a State of High Diversity. / Mathiesen, Joachim; Mitarai, Namiko; Sneppen, Kim; Trusina, Ala. In: Physical Review Letters, Vol. 107, No. 18, 25.10.2011, p. 188101.
Epidemics and concurrent immunity spread of multiple competing diseases
A minimal model for multiple epidemics and immunity spreading. / Sneppen, Kim; Trusina, Ala; Jensen, Mogens Høgh; Bornholdt, Stefan.In: PLoS ONE, Vol. 5, No. 10, 18.10.2010, p. e13326.
Information perspective in complex networks
In: Europhysics Letters, Vol. 69, No. 5, 03.2005, p. 853-859.
Functional alignment of regulatory networks: a study of temperate phages. / Trusina, Ala; Sneppen, Kim; Dodd, Ian B.; Shearwin, K. E.; Egan, J. B.In: PLoS Computational Biology, Vol. 1, No. 7, 2006.
- Self-assembly, buckling and density-invariant growth of three-dimensional vascular networks. / Kirkegaard, Julius B; Nielsen, Bjarke F; Trusina, Ala; Sneppen, Kim. Journal of the Royal Society. Interface, Bind 16, Nr. 159, 20190517, 31.10.2019.
- The fitness cost and benefit of phase-separated protein deposits. / Sanchez de Groot, Natalia; Torrent Burgas, Marc; Ravarani, Charles N.J.; Trusina, Ala; Ventura, Salvador; Babu, M. Madan. Molecular Systems Biology, Bind 15, Nr. 4, e8075, 04.2019.
- Chaperone-mediated reflux of secretory proteins to the cytosol during endoplasmic reticulum stress. / Igbaria, Aeid; Merksamer, Philip I.; Trusina, Ala; Tilahun, Firehiwot; Johnson, Jeffrey R.; Brandman, Onn; Krogan, Nevan J.; Weissman, Jonathan S.; Papa, Feroz R. Proceedings of the National Academy of Sciences of the United States of America, Bind 166, Nr. 23, 01.01.2019, s. 11291-11298.
- Theoretical tool bridging cell polarities with development of robust morphologies. / Nissen, Silas Boye; Rønhild, Steven; Trusina, Ala *; Sneppen, Kim*. eLife, Bind 7, e38407, 27.11.2018.
Impact of Zygosity on Bimodal Phenotype Distributions. / Holst-Hansen, Thomas; Abad, Elena; Muntasell, Aura; López-Botet, Miguel; Jensen, Mogens H; Trusina, Ala; Garcia-Ojalvo, Jordi.I: Biophysical Journal, Vol. 113, Nr. 1, 11.07.2017, s. 148-156.
- Four simple rules that are sufficient to generate the mammalian blastocyst. / Nissen, Silas Boye; Perera Pérez, Marta; Martin Gonzalez, Javier; Morgani, Sophie Maria Christina; Jensen, Mogens Høgh; Sneppen, Kim; Brickman, Joshua Mark; Trusina, Ala. I: PLOS Biology, Vol. 15, Nr. 7, e2000737, 12.07.2017, s. 1-30.
- Evolution of a G protein-coupled receptor response by mutations in regulatory network interactions. / Di Roberto, Raphaël B; Chang, Belinda; Trusina, Ala ; Peisajovich, Sergio G. Nature Communications, Vol. 7, 12344, 04.08.2016.
- Nucleation and spreading of a heterochromatic domain in fission yeast. / Obersriebnig, Michaela J.; Pallesen, Emil M.H.; Sneppen, Kim ; Trusina, Ala; Thon, Genevieve . Nature Communications, Vol. 7, 11518, 2016.
- Asymmetric Damage Segregation Constitutes an Emergent Population-Level Stress Response. / Vedel, Søren; Nunns, Harry; Košmrlj, Andrej; Semsey, Szabolcs; Trusina, Ala. Cell systems, 13.07.2016.
- Dynamics of the DNA repair proteins WRN and BLM in the nucleoplasm and nucleoli. / Bendtsen, Kristian Moss; Jensen, Martin Borch; May, Alfred; Rasmussen, Lene Juel ; Trusina, Ala; Bohr, Vilhelm ; Jensen, Mogens Høgh. European Biophysics Journal, Vol. 43, Nr. 10-11, 14.11.2014, s. 509-516.
- Stress induced telomere shortening : longer life with less mutations? / Trusina, Ala . B M C Systems Biology, Vol. 8, 27, 01.03.2014.
- Noisy transcription factor NF-kB oscillations stabilize and sensitize cytokine signaling in space. / Gangstad, S.W.; Feldager, C.W.; Juul, Jeppe Søgaard ; Trusina, A. Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 87, Nr. 2, 05.02.2013, s. 022702.
- Two portable recombination enhancers direct donor choice in fission yeast heterochromatin. / Jakociunas, Tadas; Holm, Lærke Rebekka; Hansen, Janne Verhein ; Trusina, Ala; Thon, Genevieve . P L o S Genetics, Vol. 9, Nr. 10, e1003762, 2013.
- Fragile DNA Repair Mechanism Reduces Ageing in Multicellular Model. / Bendtsen, Kristian Moss; Juul, Jeppe Søgaard ; Trusina, Ala .P L o S One, Vol. 7, Nr. 5, 02.05.2012, s. e36018.
- Conditional Cooperativity in Toxin-Antitoxin Regulation Prevents Random Toxin Activation and Promotes Fast Translational Recovery. / Cataudella, Ilaria; Trusina, Ala ; Sneppen, Kim; Gerdes, Kenn; Mitarai, Namiko .Nucleic Acids Research, Vol. 40, Nr. 14, 11.04.2012, s. 6424-6434.
- IRE1 alpha Induces Thioredoxin-Interacting Protein to Activate the NLRP3 Inflammasome and Promote Programmed Cell Death under Irremediable ER Stress. / Lerner, A.G.; Upton, John-Paul; Praveen, P.V.K.; Ghosh, R.; et al. Cell Metabolism, Vol. 16, Nr. 2, 08.08.2012, s. 250-264.
StemPhys: Danish National Research Foundation Center for Stem Cell Decision Making (StemPhys)
60.000.000 Dkr granted by Danish National Research Foundation, 2015-2021.
Main PI: Lene B. Oddershede, Co-PIs Mogens H. Jensen, Ala Trusina, Elke Ober, Anne Grapin Botton, Joshua Brickman.
Ala Trusina, Associate Professor
Blegdamsvej 17, 2100 København Ø.
Building E, Office: Eb1a
Phone: +45 21 28 86 47
News on Biokomplexity and Biophysics
Ala Trusina, Associate Professor
Phone: +45 21 28 86 47