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Segota I, Edwards MM, Campello A, Rappazzo BH, Wang X, Strandburg-Peshkin A, Zhou XQ, Rachakonda A, Daie K, Lussenhop A, Lee S, Tharratt K, Deshmukh A, Sebesta EM, Zhang M, Lau S, Bennedsen S, Ginsberg J, Campbell T, Wang C, Franck C. Confirmation and variability of the Allee effect in Dictyostelium discoideum cell populations,possible role of chemical signaling within cell clusters. Phys Biol 2021; 19. [PMID: 34942613 DOI: 10.1088/1478-3975/ac4613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 12/23/2021] [Indexed: 11/12/2022]
Abstract
In studies of the unicellular eukaryote Dictyostelium discoideum, many have anecdotally observed that cell dilution below a certain "threshold density" causes cells to undergo a period of slow growth (lag). However, little is documented about the slow growth phase and the reason for different growth dynamics below and above this threshold density. In this paper, we extend and correct our earlier work to report an extensive set of experiments, including the use of new cell counting technology, that set this slow-to-fast growth transition on a much firmer biological basis. We show that dilution below a certain density (around 10E4 cells/ml) causes cells to grow slower on average and exhibit a large degree of variability: sometimes a sample does not lag at all, while sometimes it takes many moderate density cell cycle times to recover back to fast growth. We perform conditioned media experiments to demonstrate that a chemical signal mediates this endogenous phenomenon. Finally, we argue that while simple models involving fluid transport of signal molecules or cluster-based signaling explain typical behavior, they do not capture the high degree of variability between samples but nevertheless favor an intra-cluster mechanism.
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Affiliation(s)
- Igor Segota
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Matthew M Edwards
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Arthur Campello
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Brendan H Rappazzo
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Xiaoning Wang
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | | | - Xiao-Qiao Zhou
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Archana Rachakonda
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Kayvon Daie
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Alexander Lussenhop
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Sungsu Lee
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Kevin Tharratt
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Amrish Deshmukh
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Elisabeth M Sebesta
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Myron Zhang
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Sharon Lau
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Sarah Bennedsen
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Jared Ginsberg
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Timothy Campbell
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Chenzheng Wang
- Cornell University, Physics Dept., Ithaca, New York, 14853-0001, UNITED STATES
| | - Carl Franck
- Physics, Cornell University, Clark Hall, Ithaca, New York, 14853-0001, UNITED STATES
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Rezaei-Lotfi S, Hunter N, Farahani RM. Coupled cycling programs multicellular self-organization of neural progenitors. Cell Cycle 2019; 18:2040-2054. [PMID: 31286803 PMCID: PMC6681778 DOI: 10.1080/15384101.2019.1638692] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 06/12/2019] [Accepted: 06/14/2019] [Indexed: 02/06/2023] Open
Abstract
Self-organization is central to the morphogenesis of multicellular organisms. However, the molecular platform that coordinates the robust emergence of complex morphological patterns from local interactions between cells remains unresolved. Here we demonstrate that neural self- organization is driven by coupled cycling of progenitor cells. In a coupled cycling mode, intercellular contacts relay extrinsic cues to override the intrinsic cycling rhythm of an individual cell and synchronize the population. The stringency of coupling and hence the synchronicity of the population is programmed by recruitment of a key coupler, β-catenin, into junctional complexes. As such, multicellular self-organization is driven by the same basic mathematical principle that governs synchronized behavior of macro-scale biological systems as diverse as the synchronized chirping of crickets, flashing of fireflies and schooling of fish; that is synchronization by coupling. It is proposed that coupled cycling foreshadows a fundamental adaptive change that facilitated evolution and diversification of multicellular life forms.
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Affiliation(s)
- Saba Rezaei-Lotfi
- IDR/Westmead Institute for Medical Research, Sydney, NSW, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia
| | - Neil Hunter
- IDR/Westmead Institute for Medical Research, Sydney, NSW, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia
| | - Ramin M Farahani
- IDR/Westmead Institute for Medical Research, Sydney, NSW, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia
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Rochman N, Si F, Sun SX. To grow is not enough: impact of noise on cell environmental response and fitness. Integr Biol (Camb) 2016; 8:1030-1039. [PMID: 27723850 PMCID: PMC5980644 DOI: 10.1039/c6ib00119j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Quantitative single cell measurements have shown that cell cycle duration (the time between cell divisions) for diverse cell types is a noisy variable. The underlying distribution is mean scalable with a universal shape for many cell types in a variety of environments. Here we explore through both experiment and theory the response of these distributions to large environmental perturbations. In particular, we discuss how the stochasticity of the ensemble may be related to the response. Our findings show that slow growing, noisy populations are more adaptive than those which are fast growing. We suggest that even non-cooperative cells in exponential growth phase may not optimize fitness through growth rate alone, but also optimize adaptability to changing conditions. In this work, we wish to emphasize that in a manner similar to genetic evolution, noise in biochemical processes may be important to allow for cells to adapt to rapid to environmental changes.
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Affiliation(s)
- Nash Rochman
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, USA
| | - Fangwei Si
- Department of Mechanical Engineering, Johns Hopkins University, USA
| | - Sean X Sun
- Department of Mechanical Engineering, Johns Hopkins University, USA and Department of Biomedical Engineering, Johns Hopkins University, USA
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Yu W, Wood KB. Synchronization and phase redistribution in self-replicating populations of coupled oscillators and excitable elements. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:062708. [PMID: 26172737 DOI: 10.1103/physreve.91.062708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Indexed: 06/04/2023]
Abstract
We study the dynamics of phase synchronization in growing populations of discrete phase oscillatory systems when the division process is coupled to the distribution of oscillator phases. Using mean-field theory, linear-stability analysis, and numerical simulations, we demonstrate that coupling between population growth and synchrony can lead to a wide range of dynamical behavior, including extinction of synchronized oscillations, the emergence of asynchronous states with unequal state (phase) distributions, bistability between oscillatory and asynchronous states or between two asynchronous states, a switch between continuous (supercritical) and discontinuous (subcritical) transitions, and modulation of the frequency of bulk oscillations.
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Affiliation(s)
- Wen Yu
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Kevin B Wood
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
- Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109, USA
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