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Leathers A, Walczak M, Brady RA, Al Samad A, Kotar J, Booth MJ, Cicuta P, Di Michele L. Reaction–Diffusion Patterning of DNA-Based Artificial Cells. J Am Chem Soc 2022; 144:17468-17476. [PMID: 36103297 PMCID: PMC9523701 DOI: 10.1021/jacs.2c06140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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Biological cells display complex internal architectures
with distinct
micro environments that establish the chemical heterogeneity needed
to sustain cellular functions. The continued efforts to create advanced
cell mimics, namely, artificial cells, demands strategies for constructing
similarly heterogeneous structures with localized functionalities.
Here, we introduce a platform for constructing membraneless artificial
cells from the self-assembly of synthetic DNA nanostructures in which
internal domains can be established thanks to prescribed reaction–diffusion
waves. The method, rationalized through numerical modeling, enables
the formation of up to five distinct concentric environments in which
functional moieties can be localized. As a proof-of-concept, we apply
this platform to build DNA-based artificial cells in which a prototypical
nucleus synthesizes fluorescent RNA aptamers that then accumulate
in a surrounding storage shell, thus demonstrating the spatial segregation
of functionalities reminiscent of that observed in biological cells.
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Affiliation(s)
- Adrian Leathers
- Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K
| | - Michal Walczak
- Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K
| | - Ryan A. Brady
- Department of Chemistry, Faculty of Natural and Mathematical Sciences, King’s College London, London SE1 1DB, U.K
| | - Assala Al Samad
- Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, U.K
- Department of Chemistry, University College London, London WC1H 0AJ, U.K
| | - Jurij Kotar
- Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K
| | - Michael J. Booth
- Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, U.K
- Department of Chemistry, University College London, London WC1H 0AJ, U.K
| | - Pietro Cicuta
- Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K
| | - Lorenzo Di Michele
- Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, London W12 0BZ, U.K
- fabriCELL, Imperial College London, Molecular Sciences Research Hub, London W12 0BZ, U.K
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2
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Bustillo-Avendaño E, Serrano-Ron L, Moreno-Risueno MA. The Root Clock as a Signal Integrator System: Ensuring Balance for Survival. FRONTIERS IN PLANT SCIENCE 2022; 13:886700. [PMID: 35665188 PMCID: PMC9161171 DOI: 10.3389/fpls.2022.886700] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/28/2022] [Indexed: 06/15/2023]
Abstract
The root system is essential for the survival of terrestrial plants, plant development, and adaptation to changing environments. The development of the root system relies on post-embryonic organogenesis and more specifically on the formation and growth of lateral roots (LR). The spacing of LR along the main root is underpinned by a precise prepatterning mechanism called the Root Clock. In Arabidopsis, the primary output of this mechanism involves the generation of periodic gene expression oscillations in a zone close to the root tip called the Oscillation Zone (OZ). Because of these oscillations, pre-branch sites (PBS) are established in the positions from which LR will emerge, although the oscillations can also possibly regulate the root wavy pattern and growth. Furthermore, we show that the Root Clock is present in LR. In this review, we describe the recent advances unraveling the inner machinery of Root Clock as well as the new tools to track the Root Clock activity. Moreover, we discuss the basis of how Arabidopsis can balance the creation of a repetitive pattern while integrating both endogenous and exogenous signals to adapt to changing environmental conditions. These signals can work as entrainment signals, but in occasions they also affect the periodicity and amplitude of the oscillatory dynamics in gene expression. Finally, we identify similarities with the Segmentation Clock of vertebrates and postulate the existence of a determination front delimiting the end of the oscillations in gene expression and initiating LR organogenesis through the activation of PBS in an ARF7 dependent-manner.
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Affiliation(s)
| | | | - Miguel A. Moreno-Risueno
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria), Madrid, Spain
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3
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Androulakis IP. Circadian rhythms and the HPA axis: A systems view. WIREs Mech Dis 2021; 13:e1518. [PMID: 33438348 DOI: 10.1002/wsbm.1518] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 11/20/2020] [Accepted: 11/30/2020] [Indexed: 12/26/2022]
Abstract
The circadian timing system comprises a network of time-keeping clocks distributed across a living host whose responsibility is to allocate resources and distribute functions temporally to optimize fitness. The molecular structures generating these rhythms have evolved to accommodate the rotation of the earth in an attempt to primarily match the light/dark periods during the 24-hr day. To maintain synchrony of timing across and within tissues, information from the central clock, located in the suprachiasmatic nucleus, is conveyed using systemic signals. Leading among those signals are endocrine hormones, and while the hypothalamic-pituitary-adrenal axis through the release of glucocorticoids is a major pacesetter. Interestingly, the fundamental units at the molecular and physiological scales that generate local and systemic signals share critical structural properties. These properties enable time-keeping systems to generate rhythmic signals and allow them to adopt specific properties as they interact with each other and the external environment. The purpose of this review is to provide a broad overview of these structures, discuss their functional characteristics, and describe some of their fundamental properties as these related to health and disease. This article is categorized under: Immune System Diseases > Computational Models Immune System Diseases > Biomedical Engineering.
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Affiliation(s)
- Ioannis P Androulakis
- Biomedical Engineering Department, Chemical & Biochemical Engineering Department, Rutgers University, New Brunswick, New Jersey.,Department of Surgery, Rutgers-Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA
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4
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Perianez-Rodriguez J, Rodriguez M, Marconi M, Bustillo-Avendaño E, Wachsman G, Sanchez-Corrionero A, De Gernier H, Cabrera J, Perez-Garcia P, Gude I, Saez A, Serrano-Ron L, Beeckman T, Benfey PN, Rodríguez-Patón A, Del Pozo JC, Wabnik K, Moreno-Risueno MA. An auxin-regulable oscillatory circuit drives the root clock in Arabidopsis. SCIENCE ADVANCES 2021; 7:eabd4722. [PMID: 33523850 PMCID: PMC7775764 DOI: 10.1126/sciadv.abd4722] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 11/06/2020] [Indexed: 05/19/2023]
Abstract
In Arabidopsis, the root clock regulates the spacing of lateral organs along the primary root through oscillating gene expression. The core molecular mechanism that drives the root clock periodicity and how it is modified by exogenous cues such as auxin and gravity remain unknown. We identified the key elements of the oscillator (AUXIN RESPONSE FACTOR 7, its auxin-sensitive inhibitor IAA18/POTENT, and auxin) that form a negative regulatory loop circuit in the oscillation zone. Through multilevel computer modeling fitted to experimental data, we explain how gene expression oscillations coordinate with cell division and growth to create the periodic pattern of organ spacing. Furthermore, gravistimulation experiments based on the model predictions show that external auxin stimuli can lead to entrainment of the root clock. Our work demonstrates the mechanism underlying a robust biological clock and how it can respond to external stimuli.
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Affiliation(s)
- Juan Perianez-Rodriguez
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Marcos Rodriguez
- Departamento de Inteligencia Artificial, ETSIINF, Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | - Marco Marconi
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Estefano Bustillo-Avendaño
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Guy Wachsman
- Department of Biology, Howard Hughes Medical Institute, Duke University, Durham, NC 27708, USA
| | - Alvaro Sanchez-Corrionero
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Hugues De Gernier
- Ghent University, Department of Plant Biotechnology and Bioinformatics, Technologiepark 71, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052 Ghent, Belgium
| | - Javier Cabrera
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Pablo Perez-Garcia
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Inmaculada Gude
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Angela Saez
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Laura Serrano-Ron
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Tom Beeckman
- Ghent University, Department of Plant Biotechnology and Bioinformatics, Technologiepark 71, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052 Ghent, Belgium
| | - Philip N Benfey
- Department of Biology, Howard Hughes Medical Institute, Duke University, Durham, NC 27708, USA
| | - Alfonso Rodríguez-Patón
- Departamento de Inteligencia Artificial, ETSIINF, Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | - Juan Carlos Del Pozo
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Krzysztof Wabnik
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain.
| | - Miguel A Moreno-Risueno
- Centro de Biotecnología y Genómica de Plantas (Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria). Campus de Montegancedo, Pozuelo de Alarcón, 28223 Madrid, Spain.
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5
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Xuan W, De Gernier H, Beeckman T. The dynamic nature and regulation of the root clock. Development 2020; 147:147/3/dev181446. [DOI: 10.1242/dev.181446] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
ABSTRACT
Plants explore the soil by continuously expanding their root system, a process that depends on the production of lateral roots (LRs). Sites where LRs can be produced are specified in the primary root axis through a pre-patterning mechanism, determined by a biological clock that is coordinated by temporal signals and positional cues. This ‘root clock’ generates an oscillatory signal that is translated into a developmental cue to specify a set of founder cells for LR formation. In this Review, we summarize recent findings that shed light on the mechanisms underlying the oscillatory signal and discuss how a periodic signal contributes to the conversion of founder cells into LR primordia. We also provide an overview of the phases of the root clock that may be influenced by endogenous factors, such as the plant hormone auxin, and by exogenous environmental cues. Finally, we discuss additional aspects of the root-branching process that act independently of the root clock.
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Affiliation(s)
- Wei Xuan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | - Hugues De Gernier
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, B-9052 Ghent, Belgium
- VIB-UGent Center for Plant Systems Biology, Technologiepark 71, B-9052 Ghent, Belgium
| | - Tom Beeckman
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, B-9052 Ghent, Belgium
- VIB-UGent Center for Plant Systems Biology, Technologiepark 71, B-9052 Ghent, Belgium
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6
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Acevedo LA, Korson NE, Williams JM, Nicholson LK. Tuning a timing device that regulates lateral root development in rice. JOURNAL OF BIOMOLECULAR NMR 2019; 73:493-507. [PMID: 31407206 PMCID: PMC7141409 DOI: 10.1007/s10858-019-00258-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 06/18/2019] [Indexed: 06/10/2023]
Abstract
Peptidyl Prolyl Isomerases (PPIases) accelerate cis-trans isomerization of prolyl peptide bonds. In rice, the PPIase LRT2 is essential for lateral root initiation. LRT2 displays in vitro isomerization of a highly conserved W-P peptide bond (104W-P105) in the natural substrate OsIAA11. OsIAA11 is a transcription repressor that, in response to the plant hormone auxin, is targeted to ubiquitin-mediated proteasomal degradation via specific recognition of the cis isomer of its 104W-P105 peptide bond. OsIAA11 controls transcription of specific genes, including its own, that are required for lateral root development. This auxin-responsive negative feedback circuit governs patterning and development of lateral roots along the primary root. The ability to tune LRT2 activity via mutagenesis is crucial for understanding and modeling the role of this bimodal switch in the auxin circuit and lateral root development. We present characterization of the thermal stability and isomerization rates of several LRT2 mutants acting on the OsIAA11 substrate. The thermally stable mutants display activities lower than that of wild-type (WT) LRT2. These include binding diminished but catalytically active P125K, binding incompetent W128A, and binding capable but catalytically incompetent H133Q mutations. Additionally, LRT2 homologs hCypA from human, TaCypA from Triticum aestivum (wheat) and PPIB from E. coli were shown to have 110, 50 and 60% of WT LRT2 activity on the OsIAA11 substrate. These studies identify several thermally stable LRT2 mutants with altered activities that will be useful for establishing relationships between cis-trans isomerization, auxin circuit dynamics, and lateral root development in rice.
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Affiliation(s)
- Lucila Andrea Acevedo
- Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY, 14853, USA
- Department of Biochemistry and Biophysics and the Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Nathan E Korson
- Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY, 14853, USA
| | - Justin M Williams
- Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY, 14853, USA
| | - Linda K Nicholson
- Department of Molecular Biology & Genetics, Cornell University, Ithaca, NY, 14853, USA.
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7
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Chen Y, Xie Y, Song C, Zheng L, Rong X, Jia L, Luo L, Zhang C, Qu X, Xuan W. A comparison of lateral root patterning among dicot and monocot plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 274:201-211. [PMID: 30080605 DOI: 10.1016/j.plantsci.2018.05.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 04/18/2018] [Accepted: 05/21/2018] [Indexed: 05/22/2023]
Abstract
Lateral root branching along the primary root involves complex gene regulatory networks in model plant Arabidopsis. However, it is largely unclarified whether different plant species share a common mechanism to pattern the lateral root along the primary axis. In this study, we assessed the development pattern of lateral root among several dicot and monocot plants, including Arabidopsis, tomato, Medicago, Nicotiana, rice, and ryegrass by using an agar-gel culture system. Our results reveal a regular-spaced distribution pattern of lateral roots along the primary root axis of both dicot and monocot plants. Meanwhile, the root patterning is tightly controlled by root bending and the plant hormone auxin. However, nitrogen and phosphate starvations trigger distinguished root growth patterns among different plant species. Our studies strongly suggest a partially shared signaling pathway underlying root patterning of various plant species, and also provide a foundation for further identification of genes associated with root development.
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Affiliation(s)
- Yuqin Chen
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yuanming Xie
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Caihong Song
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Lulu Zheng
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Xiong Rong
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Letian Jia
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Long Luo
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Chi Zhang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Xiaoxiao Qu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Wei Xuan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, 210095, PR China.
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8
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Kircher S, Schopfer P. The plant hormone auxin beats the time for oscillating, light-regulated lateral root induction. Development 2018; 145:dev.169839. [DOI: 10.1242/dev.169839] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 10/29/2018] [Indexed: 11/20/2022]
Abstract
The molecular mechanism underlying the periodic induction of lateral roots, a paradigmatic example of clock-driven organ formation in plant development, is presently a matter of ongoing, controversial debate. Here we provide experimental evidence that this clock is frequency-modulated by light and that auxin serves as a mediator for translating continuous light signals into discontinuous gene activation signals preceding the initiation of lateral roots in Arabidopsis seedlings. Based on this evidence, we propose a molecular model of an ultradian biological clock involving auxin-dependent degradation of an AUX/IAA-type transcription repressor as a flexible, frequency-controlling delay element. This model widens the bandwidth of biological clocks by adding a new type that allows the pace of organ formation to adapt to the changing environmental demands of the growing plant.
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Affiliation(s)
- Stefan Kircher
- Department of Molecular Plant Physiology, Faculty of Biology, Albert-Ludwigs-University, Schänzlestr. 1, D-79104-Freiburg, Germany
| | - Peter Schopfer
- Department of Molecular Plant Physiology, Faculty of Biology, Albert-Ludwigs-University, Schänzlestr. 1, D-79104-Freiburg, Germany
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9
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Tyler SEB. Nature's Electric Potential: A Systematic Review of the Role of Bioelectricity in Wound Healing and Regenerative Processes in Animals, Humans, and Plants. Front Physiol 2017; 8:627. [PMID: 28928669 PMCID: PMC5591378 DOI: 10.3389/fphys.2017.00627] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Accepted: 08/11/2017] [Indexed: 12/24/2022] Open
Abstract
Natural endogenous voltage gradients not only predict and correlate with growth and development but also drive wound healing and regeneration processes. This review summarizes the existing literature for the nature, sources, and transmission of information-bearing bioelectric signals involved in controlling wound healing and regeneration in animals, humans, and plants. It emerges that some bioelectric characteristics occur ubiquitously in a range of animal and plant species. However, the limits of similarities are probed to give a realistic assessment of future areas to be explored. Major gaps remain in our knowledge of the mechanistic basis for these processes, on which regenerative therapies ultimately depend. In relation to this, it is concluded that the mapping of voltage patterns and the processes generating them is a promising future research focus, to probe three aspects: the role of wound/regeneration currents in relation to morphology; the role of endogenous flux changes in driving wound healing and regeneration; and the mapping of patterns in organisms of extreme longevity, in contrast with the aberrant voltage patterns underlying impaired healing, to inform interventions aimed at restoring them.
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10
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Abstract
The central nervous system (CNS) underlies memory, perception, decision-making, and behavior in numerous organisms. However, neural networks have no monopoly on the signaling functions that implement these remarkable algorithms. It is often forgotten that neurons optimized cellular signaling modes that existed long before the CNS appeared during evolution, and were used by somatic cellular networks to orchestrate physiology, embryonic development, and behavior. Many of the key dynamics that enable information processing can, in fact, be implemented by different biological hardware. This is widely exploited by organisms throughout the tree of life. Here, we review data on memory, learning, and other aspects of cognition in a range of models, including single celled organisms, plants, and tissues in animal bodies. We discuss current knowledge of the molecular mechanisms at work in these systems, and suggest several hypotheses for future investigation. The study of cognitive processes implemented in aneural contexts is a fascinating, highly interdisciplinary topic that has many implications for evolution, cell biology, regenerative medicine, computer science, and synthetic bioengineering.
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Affiliation(s)
- František Baluška
- Department of Plant Cell Biology, IZMB, University of Bonn Bonn, Germany
| | - Michael Levin
- Biology Department, Tufts Center for Regenerative and Developmental Biology, Tufts University Medford, MA, USA
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11
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Abstract
In this study, Marhavý et al. investigate the role of auxin in the early lateral root initiation and identify a dual, spatiotemporally distinct role of auxin during the early phases of lateral root organogenesis. Using a cell ablation technique that can eliminate a single cell in the developing root, they show that auxin can relieve inhibition of pericycle meristematic activity by cell-to-cell interactions in the endodermis and defines the orientation of the cell division plane to initiate the lateral root developmental program in the pericycle. To sustain a lifelong ability to initiate organs, plants retain pools of undifferentiated cells with a preserved proliferation capacity. The root pericycle represents a unique tissue with conditional meristematic activity, and its tight control determines initiation of lateral organs. Here we show that the meristematic activity of the pericycle is constrained by the interaction with the adjacent endodermis. Release of these restraints by elimination of endodermal cells by single-cell ablation triggers the pericycle to re-enter the cell cycle. We found that endodermis removal substitutes for the phytohormone auxin-dependent initiation of the pericycle meristematic activity. However, auxin is indispensable to steer the cell division plane orientation of new organ-defining divisions. We propose a dual, spatiotemporally distinct role for auxin during lateral root initiation. In the endodermis, auxin releases constraints arising from cell-to-cell interactions that compromise the pericycle meristematic activity, whereas, in the pericycle, auxin defines the orientation of the cell division plane to initiate lateral roots.
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12
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Rabajante JF, Babierra AL. Branching and oscillations in the epigenetic landscape of cell-fate determination. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2015; 117:240-249. [DOI: 10.1016/j.pbiomolbio.2015.01.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 01/05/2015] [Accepted: 01/18/2015] [Indexed: 12/15/2022]
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13
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Baluška F, Mancuso S. Root apex transition zone as oscillatory zone. FRONTIERS IN PLANT SCIENCE 2013; 4:354. [PMID: 24106493 PMCID: PMC3788588 DOI: 10.3389/fpls.2013.00354] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 08/22/2013] [Indexed: 05/17/2023]
Abstract
Root apex of higher plants shows very high sensitivity to environmental stimuli. The root cap acts as the most prominent plant sensory organ; sensing diverse physical parameters such as gravity, light, humidity, oxygen, and critical inorganic nutrients. However, the motoric responses to these stimuli are accomplished in the elongation region. This spatial discrepancy was solved when we have discovered and characterized the transition zone which is interpolated between the apical meristem and the subapical elongation zone. Cells of this zone are very active in the cytoskeletal rearrangements, endocytosis and endocytic vesicle recycling, as well as in electric activities. Here we discuss the oscillatory nature of the transition zone which, together with several other features of this zone, suggest that it acts as some kind of command center. In accordance with the early proposal of Charles and Francis Darwin, cells of this root zone receive sensory information from the root cap and instruct the motoric responses of cells in the elongation zone.
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Affiliation(s)
- František Baluška
- Institute of Cellular and Molecular Botany, Department of Plant Cell Biology, University of BonnBonn, Germany
| | - Stefano Mancuso
- LINV – DiSPAA, Department of Agri-Food and Environmental Science, University of FlorenceSesto Fiorentino, Italy
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Estornell LH, Pons C, Martínez A, O'Connor JE, Orzaez D, Granell A. A VIN1 GUS::GFP fusion reveals activated sucrose metabolism programming occurring in interspersed cells during tomato fruit ripening. JOURNAL OF PLANT PHYSIOLOGY 2013; 170:1113-21. [PMID: 23598179 DOI: 10.1016/j.jplph.2013.03.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 03/14/2013] [Accepted: 03/14/2013] [Indexed: 05/22/2023]
Abstract
The tomato is a model for fleshy fruit development and ripening. Here we report on the identification of a novel unique cell autonomous/cellular pattern of expression that was detected in fruits of transgenic tomato lines carrying a GFP GUS driven by the fruit specific vacuolar invertase promoter VIN1. The VIN1 promoter sequence faithfully reproduced the global endogenous VIN expression by conferring a biphasic pattern of expression with a second phase clearly associated to fruit ripening. A closer view revealed a salt and pepper pattern of expression characterized by individual cells exhibiting a range of expression levels (from high to low) surrounded by cells with no expression. This type of pattern was detected across different fruit tissues and cell types with some preferences for vascular, sub-epidermal layer and the inner part of the fruit. Cell ability to show promoter activity was neither directly associated with overall ripening - as we find VIN+ and - VIN- cells at all stages of ripening, nor with cell size. Nevertheless the number of cells with active VIN-driven expression increased with ripening and the activity of the VIN promoter seems to be inversely correlated with cell size in VIN+ cells. Gene expression analysis of FACS-sorted VIN+ cells revealed a transcriptionally distinct subpopulation of cells defined by increased expression of genes related to sucrose metabolism, and decreased activity in protein synthesis and chromatin remodeling. This finding suggests that local micro heterogeneity may underlie some aspects (i.e. the futile cycles involving sucrose metabolism) of an otherwise more uniform looking ripening program.
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Affiliation(s)
- Leandro Hueso Estornell
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Ingeniero Fausto Elio s/n, 46022 Valencia, Spain
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15
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Baluška F, Mancuso S. Ion channels in plants: from bioelectricity, via signaling, to behavioral actions. PLANT SIGNALING & BEHAVIOR 2013; 8:e23009. [PMID: 23221742 PMCID: PMC3745586 DOI: 10.4161/psb.23009] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Accepted: 11/27/2012] [Indexed: 05/20/2023]
Abstract
In his recent opus magnum review paper published in the October issue of Physiology Reviews, Rainer Hedrich summarized the field of plant ion channels. (1) He started from the earliest electric recordings initiated by Charles Darwin of carnivorous Dionaea muscipula, (1,2) known as Venus flytrap, and covered the topic extensively up to the most recent discoveries on Shaker-type potassium channels, anion channels of SLAC/SLAH families, and ligand-activated channels of glutamate receptor-like type (GLR) and cyclic nucleotide-gated channels (CNGC). (1.)
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Affiliation(s)
- František Baluška
- University of Bonn; IZMB; Bonn, Germany
- Correspondence to: František Baluška,
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16
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Shinde S, Shinde R, Downey F, Ng CKY. Abiotic stress-induced oscillations in steady-state transcript levels of Group 3 LEA protein genes in the moss, Physcomitrella patens. PLANT SIGNALING & BEHAVIOR 2013; 8:e22535. [PMID: 23221763 PMCID: PMC3745561 DOI: 10.4161/psb.22535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 10/12/2012] [Accepted: 10/12/2012] [Indexed: 05/26/2023]
Abstract
The moss, Physcomitrella patens is a non-seed land plant belonging to early diverging lineages of land plants following colonization of land in the Ordovician period in Earth's history. Evidence suggests that mosses can be highly tolerant of abiotic stress. We showed previously that dehydration stress and abscisic acid treatments induced oscillations in steady-state levels of LEA (Late Embryogenesis Abundant) protein transcripts, and that removal of ABA resulted in rapid attenuation of oscillatory increases in transcript levels. Here, we show that other abiotic stresses like salt and osmotic stresses also induced oscillations in steady-state transcript levels and that the amplitudes of the oscillatory increases in steady-state transcript levels are reflective of the severity of the abiotic stress treatment. Together, our results suggest that oscillatory increases in transcript levels in response to abiotic stresses may be a general phenomenon in P. patens and that temporally dynamic increases in steady-state transcript levels may be important for adaptation to life in constantly fluctuating environmental conditions.
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17
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Shinde S, Nurul Islam M, Ng CKY. Dehydration stress-induced oscillations in LEA protein transcripts involves abscisic acid in the moss, Physcomitrella patens. THE NEW PHYTOLOGIST 2012; 195:321-328. [PMID: 22591374 DOI: 10.1111/j.1469-8137.2012.04193.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
• Physcomitrella patens is a bryophyte belonging to early diverging lineages of land plants following colonization of land in the Ordovician period. Mosses are typically found in refugial habitats and can experience rapidly fluctuating environmental conditions. The acquisition of dehydration tolerance by bryophytes is of fundamental importance as they lack water-conducting tissues and are generally one cell layer thick. • Here, we show that dehydration induced oscillations in the steady-state transcript abundances of two group 3 late embryogenesis abundant (LEA) protein genes in P. patens protonemata, and that the amplitudes of these oscillations are reflective of the severity of dehydration stress. • Dehydration stress also induced elevations in the concentrations of abscisic acid (ABA), and ABA alone can also induce dosage-dependent oscillatory increases in the steady-state abundance of LEA protein transcripts. Additionally, removal of ABA resulted in rapid attenuation of these oscillatory increases. • Our data demonstrate that dehydration stress-regulated expression of LEA protein genes is temporally dynamic and highlight the importance of oscillations as a robust mechanism for optimal responses. Our results suggest that dehydration stress-induced oscillations in the steady-state abundance of LEA protein transcripts may constitute an important cellular strategy for adaptation to life in a constantly changing environment.
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Affiliation(s)
- Suhas Shinde
- School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - M Nurul Islam
- School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Carl K-Y Ng
- School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland
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18
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Abstract
Development of multicellular organisms requires specification of diverse cell types. In plants, development is continuous and because plant cells are surrounded by rigid cell walls, cell division and specification of daughter cell fate must be carefully orchestrated. During embryonic and postembryonic plant development, the specification of cell types is determined both by positional cues and cell lineage. The establishment of distinct transcriptional domains is a fundamental mechanism for determining different cell fates. In this review, we focus on four examples from recent literature of switches operating in cell fate decisions that are regulated by transcriptional mechanisms. First, we highlight a transcriptional mechanism involving a mobile transcription factor in formation of the two ground tissue cell types in roots. Specification of vascular cell types is then discussed, including new details about xylem cell-type specification via a mobile microRNA. Next, transcriptional regulation of two key embryonic developmental events is considered: establishment of apical-basal polarity in the single-celled zygote and specification of distinct root and shoot stem cell populations in the plant embryo. Finally, a dynamic transcriptional mechanism for lateral organ positioning that integrates spatial and temporal information into a repeating pattern is summarized.
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19
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Okumoto S, Jones A, Frommer WB. Quantitative imaging with fluorescent biosensors. ANNUAL REVIEW OF PLANT BIOLOGY 2012; 63:663-706. [PMID: 22404462 DOI: 10.1146/annurev-arplant-042110-103745] [Citation(s) in RCA: 158] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Molecular activities are highly dynamic and can occur locally in subcellular domains or compartments. Neighboring cells in the same tissue can exist in different states. Therefore, quantitative information on the cellular and subcellular dynamics of ions, signaling molecules, and metabolites is critical for functional understanding of organisms. Mass spectrometry is generally used for monitoring ions and metabolites; however, its temporal and spatial resolution are limited. Fluorescent proteins have revolutionized many areas of biology-e.g., fluorescent proteins can report on gene expression or protein localization in real time-yet promoter-based reporters are often slow to report physiologically relevant changes such as calcium oscillations. Therefore, novel tools are required that can be deployed in specific cells and targeted to subcellular compartments in order to quantify target molecule dynamics directly. We require tools that can measure enzyme activities, protein dynamics, and biophysical processes (e.g., membrane potential or molecular tension) with subcellular resolution. Today, we have an extensive suite of tools at our disposal to address these challenges, including translocation sensors, fluorescence-intensity sensors, and Förster resonance energy transfer sensors. This review summarizes sensor design principles, provides a database of sensors for more than 70 different analytes/processes, and gives examples of applications in quantitative live cell imaging.
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Affiliation(s)
- Sakiko Okumoto
- Department of Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA 24061, USA
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