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De la Fuente IM, Bringas C, Malaina I, Regner B, Pérez-Samartín A, Boyano MD, Fedetz M, López JI, Pérez-Yarza G, Cortes JM, Sejnowski T. The nucleus does not significantly affect the migratory trajectories of amoeba in two-dimensional environments. Sci Rep 2019; 9:16369. [PMID: 31704992 PMCID: PMC6841717 DOI: 10.1038/s41598-019-52716-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 10/21/2019] [Indexed: 12/11/2022] Open
Abstract
For a wide range of cells, from bacteria to mammals, locomotion movements are a crucial systemic behavior for cellular life. Despite its importance in a plethora of fundamental physiological processes and human pathologies, how unicellular organisms efficiently regulate their locomotion system is an unresolved question. Here, to understand the dynamic characteristics of the locomotion movements and to quantitatively study the role of the nucleus in the migration of Amoeba proteus we have analyzed the movement trajectories of enucleated and non-enucleated amoebas on flat two-dimensional (2D) surfaces using advanced non-linear physical-mathematical tools and computational methods. Our analysis shows that both non-enucleated and enucleated amoebas display the same kind of dynamic migration structure characterized by highly organized data sequences, super-diffusion, non-trivial long-range positive correlations, persistent dynamics with trend-reinforcing behavior, and move-step fluctuations with scale invariant properties. Our results suggest that the presence of the nucleus does not significantly affect the locomotion of amoeba in 2D environments.
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Affiliation(s)
- Ildefonso M De la Fuente
- Department of Nutrition, CEBAS-CSIC Institute, Espinardo University Campus, Murcia, 30100, Spain.
- Department of Mathematics, Faculty of Science and Technology, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain.
| | - Carlos Bringas
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - Iker Malaina
- Department of Applied Mathematics, Statistics and Operational Research, Faculty of Science and Technology, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | | | - Alberto Pérez-Samartín
- Department of Neurosciences, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - María Dolores Boyano
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - María Fedetz
- Department of Cellular Biology and Immunology, Institute of Parasitology and Biomedicine "López-Neyra", CSIC, Granada, 18100, Spain
| | - José I López
- Department of Pathology, Cruces University Hospital, Biocruces-Bizkaia Health Research Institute, University of the Basque Country, UPV/EHU, Barakaldo, 48903, Spain
| | - Gorka Pérez-Yarza
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
| | - Jesus M Cortes
- Department of Cell Biology and Histology, Faculty of Medicine and Nursing, University of the Basque Country, UPV/EHU, Leioa, 48940, Spain
- Biocruces-Bizkaia Health Research Institute, Cruces University Hospital, Barakaldo, 48903, Spain
- IKERBASQUE: The Basque Foundation for Science, Bilbao, 48013, Spain
| | - Terrence Sejnowski
- Computational Neurobiology Laboratory, Howard Hughes Medical Institute, The Salk Institute for Biological Studies, La Jolla, California, 92037, USA
- Division of Biological Sciences, University of California, San Diego, La Jolla, California, 92093, USA
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Posey D, Blaisdell-Pijuan P, Knoll SK, Saif TA, Ahmed WW. Small-scale displacement fluctuations of vesicles in fibroblasts. Sci Rep 2018; 8:13294. [PMID: 30185883 PMCID: PMC6125338 DOI: 10.1038/s41598-018-31656-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 08/16/2018] [Indexed: 11/09/2022] Open
Abstract
The intracellular environment is a dynamic space filled with various organelles moving in all directions. Included in this diverse group of organelles are vesicles, which are involved in transport of molecular cargo throughout the cell. Vesicles move in either a directed or non-directed fashion, often depending on interactions with cytoskeletal proteins such as microtubules, actin filaments, and molecular motors. How these proteins affect the local fluctuations of vesicles in the cytoplasm is not clear since they have the potential to both facilitate and impede movement. Here we show that vesicle mobility is significantly affected by myosin-II, even though it is not a cargo transport motor. We find that myosin-II activity increases the effective diffusivity of vesicles and its inhibition facilitates longer states of non-directed motion. Our study suggests that altering myosin-II activity in the cytoplasm of cells can modulate the mobility of vesicles, providing a possible mechanism for cells to dynamically tune the cytoplasmic environment in space and time.
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Affiliation(s)
- Danielle Posey
- Department of Biological Science, California State University, Fullerton, CA, USA
| | | | - Samantha K Knoll
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL, USA
| | - Taher A Saif
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL, USA
| | - Wylie W Ahmed
- Department of Physics, California State University, Fullerton, CA, USA.
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Günther MN, Nettesheim G, Shubeita GT. Quantifying and predicting Drosophila larvae crawling phenotypes. Sci Rep 2016; 6:27972. [PMID: 27323901 PMCID: PMC4914969 DOI: 10.1038/srep27972] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 05/26/2016] [Indexed: 11/09/2022] Open
Abstract
The fruit fly Drosophila melanogaster is a widely used model for cell biology, development, disease, and neuroscience. The fly's power as a genetic model for disease and neuroscience can be augmented by a quantitative description of its behavior. Here we show that we can accurately account for the complex and unique crawling patterns exhibited by individual Drosophila larvae using a small set of four parameters obtained from the trajectories of a few crawling larvae. The values of these parameters change for larvae from different genetic mutants, as we demonstrate for fly models of Alzheimer's disease and the Fragile X syndrome, allowing applications such as genetic or drug screens. Using the quantitative model of larval crawling developed here we use the mutant-specific parameters to robustly simulate larval crawling, which allows estimating the feasibility of laborious experimental assays and aids in their design.
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Affiliation(s)
- Maximilian N. Günther
- Center for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, Austin, TX 78712, USA
| | - Guilherme Nettesheim
- Center for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, Austin, TX 78712, USA
| | - George T. Shubeita
- Center for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, Austin, TX 78712, USA
- New York University Abu Dhabi, P. O. Box 129188, Abu Dhabi, United Arab Emirates
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