51
|
Williams EA, Verasztó C, Jasek S, Conzelmann M, Shahidi R, Bauknecht P, Mirabeau O, Jékely G. Synaptic and peptidergic connectome of a neurosecretory center in the annelid brain. eLife 2017; 6:26349. [PMID: 29199953 PMCID: PMC5747525 DOI: 10.7554/elife.26349] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 12/02/2017] [Indexed: 12/15/2022] Open
Abstract
Neurosecretory centers in animal brains use peptidergic signaling to influence physiology and behavior. Understanding neurosecretory center function requires mapping cell types, synapses, and peptidergic networks. Here we use transmission electron microscopy and gene expression mapping to analyze the synaptic and peptidergic connectome of an entire neurosecretory center. We reconstructed 78 neurosecretory neurons and mapped their synaptic connectivity in the brain of larval Platynereis dumerilii, a marine annelid. These neurons form an anterior neurosecretory center expressing many neuropeptides, including hypothalamic peptide orthologs and their receptors. Analysis of peptide-receptor pairs in spatially mapped single-cell transcriptome data revealed sparsely connected networks linking specific neuronal subsets. We experimentally analyzed one peptide-receptor pair and found that a neuropeptide can couple neurosecretory and synaptic brain signaling. Our study uncovered extensive networks of peptidergic signaling within a neurosecretory center and its connection to the synaptic brain.
Collapse
Affiliation(s)
| | - Csaba Verasztó
- Max Planck Institute for Developmental Biology, Tübingen, Germany
| | - Sanja Jasek
- Max Planck Institute for Developmental Biology, Tübingen, Germany
| | | | - Réza Shahidi
- Max Planck Institute for Developmental Biology, Tübingen, Germany.,Living Systems Institute, University of Exeter, Exeter, United Kingdom
| | | | - Olivier Mirabeau
- Genetics and Biology of Cancers Unit, Institut Curie, INSERM U830, Paris Sciences et Lettres Research University, Paris, France
| | - Gáspár Jékely
- Max Planck Institute for Developmental Biology, Tübingen, Germany.,Living Systems Institute, University of Exeter, Exeter, United Kingdom
| |
Collapse
|
52
|
Carrillo-Baltodano AM, Meyer NP. Decoupling brain from nerve cord development in the annelid Capitella teleta: Insights into the evolution of nervous systems. Dev Biol 2017; 431:134-144. [DOI: 10.1016/j.ydbio.2017.09.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 09/17/2017] [Accepted: 09/17/2017] [Indexed: 10/18/2022]
|
53
|
Mayo JC, Sainz RM, González-Menéndez P, Hevia D, Cernuda-Cernuda R. Melatonin transport into mitochondria. Cell Mol Life Sci 2017; 74:3927-3940. [PMID: 28828619 PMCID: PMC11107582 DOI: 10.1007/s00018-017-2616-8] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 08/03/2017] [Indexed: 12/15/2022]
Abstract
Melatonin is a well-known, nighttime-produced indole found in bacteria, eukaryotic unicellulars, animals or vascular plants. In vertebrates, melatonin is the major product of the pineal gland, which accounts for its increase in serum during the dark phase, but it is also produced by many other organs and cell types. Such a wide distribution is consistent with its multiple and well-described functions which include from the circadian regulation and adaptation to seasonal variations to immunomodulatory and oncostatic actions in different types of tumors. The discovery of its antioxidant properties in the early 1990s opened a new field of potential protective functions in multiple tissues. A special mention should be made regarding the nervous system, where the indole is considered a major neuroprotector. Furthermore, mitochondria appear as one of the most important targets for the indole's protective actions. Melatonin's mechanisms of action vary from the direct molecular interaction with free radicals (free radical scavenger) to the binding to membrane (MLT1A and MLT1B) or nuclear receptors (RZR/RORα). Receptor binding has been associated with some, but not all of the indole functions reported to date. Recently, two new mechanisms of cellular uptake involving the facilitative glucose transporters GLUT/SLC2A and the proton-driven oligopeptide transporter PEPT1/2 have been reported. Here we discuss the potential importance that these newly discovered transport systems could have in determining the actions of melatonin, particularly in the mitochondria. We also argue the relative importance of passive diffusion vs active transport in different parts of the cell.
Collapse
Affiliation(s)
- Juan C Mayo
- Departamento de Morfología y Biología Celular, Facultad de Medicina, Universidad de Oviedo, C/Julián Clavería, 6, 33006, Oviedo, Asturias, Spain.
- Instituto Universitario Oncológico del Principado de Asturias, Universidad de Oviedo, Oviedo, Spain.
| | - Rosa M Sainz
- Departamento de Morfología y Biología Celular, Facultad de Medicina, Universidad de Oviedo, C/Julián Clavería, 6, 33006, Oviedo, Asturias, Spain
- Instituto Universitario Oncológico del Principado de Asturias, Universidad de Oviedo, Oviedo, Spain
| | - Pedro González-Menéndez
- Departamento de Morfología y Biología Celular, Facultad de Medicina, Universidad de Oviedo, C/Julián Clavería, 6, 33006, Oviedo, Asturias, Spain
- Instituto Universitario Oncológico del Principado de Asturias, Universidad de Oviedo, Oviedo, Spain
| | - David Hevia
- Departamento de Morfología y Biología Celular, Facultad de Medicina, Universidad de Oviedo, C/Julián Clavería, 6, 33006, Oviedo, Asturias, Spain
- Instituto Universitario Oncológico del Principado de Asturias, Universidad de Oviedo, Oviedo, Spain
| | - Rafael Cernuda-Cernuda
- Departamento de Morfología y Biología Celular, Facultad de Medicina, Universidad de Oviedo, C/Julián Clavería, 6, 33006, Oviedo, Asturias, Spain
| |
Collapse
|
54
|
Boutet A. The evolution of asymmetric photosensitive structures in metazoans and the Nodal connection. Mech Dev 2017; 147:49-60. [PMID: 28986126 DOI: 10.1016/j.mod.2017.09.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 07/26/2017] [Accepted: 09/25/2017] [Indexed: 01/12/2023]
Abstract
Asymmetries are observed in a great number of taxa in metazoans. More particularly, functional lateralization and neuroanatomical asymmetries within the central nervous system have been a matter of intense research for at least two hundred years. While asymmetries of some paired structures/organs (e.g. eyes, ears, kidneys, legs, arms) constitute random deviations from a pure bilateral symmetry, brain asymmetries such as those observed in the cortex and epithalamus are directional. This means that molecular and anatomical features located on one side of a given structure are observed in most individuals. For instance, in humans, the neuronal tract connecting the language areas is enlarged in the left hemisphere. When asymmetries are fixed, their molecular mechanisms can be studied using mutants displaying different phenotypes: left or right isomerism of the structure, reversed asymmetry or random asymmetry. Our understanding of asymmetry in the nervous system has been widely enriched thanks to the characterization of mutants affecting epithalamus asymmetry. Furthermore, two decades ago, pioneering studies revealed that a specific morphogen, Nodal, active only on one side of the embryo during development is an important molecule in asymmetry patterning. In this review, I have gathered important data bringing insight into the origin and evolution of epithalamus asymmetry and the role of Nodal in metazoans. After a short introduction on brain asymmetries (chapter I), I secondly focus on the molecular and anatomical characteristics of the epithalamus in vertebrates and explore some functional aspects such as its photosensitive ability related to the pineal complex (chapter II). Third, I discuss homology relationship of the parapineal organ among vertebrates (chapter III). Fourth, I discuss the possible origin of the epithalamus, presenting cells displaying photosensitive properties and/or asymmetry in the anterior part of the body in non-vertebrates (chapter IV). Finally, I report Nodal signaling expression data and functional experiments performed in different metazoan groups (chapter V).
Collapse
Affiliation(s)
- Agnès Boutet
- Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 8227, Laboratoire de Biologie Intégrative des Modèles Marins, Station Biologique, F-29688 Roscoff, France.
| |
Collapse
|
55
|
Nath RD, Bedbrook CN, Abrams MJ, Basinger T, Bois JS, Prober DA, Sternberg PW, Gradinaru V, Goentoro L. The Jellyfish Cassiopea Exhibits a Sleep-like State. Curr Biol 2017; 27:2984-2990.e3. [PMID: 28943083 DOI: 10.1016/j.cub.2017.08.014] [Citation(s) in RCA: 124] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 07/17/2017] [Accepted: 08/04/2017] [Indexed: 12/28/2022]
Abstract
Do all animals sleep? Sleep has been observed in many vertebrates, and there is a growing body of evidence for sleep-like states in arthropods and nematodes [1-5]. Here we show that sleep is also present in Cnidaria [6-8], an earlier-branching metazoan lineage. Cnidaria and Ctenophora are the first metazoan phyla to evolve tissue-level organization and differentiated cell types, such as neurons and muscle [9-15]. In Cnidaria, neurons are organized into a non-centralized radially symmetric nerve net [11, 13, 15-17] that nevertheless shares fundamental properties with the vertebrate nervous system: action potentials, synaptic transmission, neuropeptides, and neurotransmitters [15-20]. It was reported that cnidarian soft corals [21] and box jellyfish [22, 23] exhibit periods of quiescence, a pre-requisite for sleep-like states, prompting us to ask whether sleep is present in Cnidaria. Within Cnidaria, the upside-down jellyfish Cassiopea spp. displays a quantifiable pulsing behavior, allowing us to perform long-term behavioral tracking. Monitoring of Cassiopea pulsing activity for consecutive days and nights revealed behavioral quiescence at night that is rapidly reversible, as well as a delayed response to stimulation in the quiescent state. When deprived of nighttime quiescence, Cassiopea exhibited decreased activity and reduced responsiveness to a sensory stimulus during the subsequent day, consistent with homeostatic regulation of the quiescent state. Together, these results indicate that Cassiopea has a sleep-like state, supporting the hypothesis that sleep arose early in the metazoan lineage, prior to the emergence of a centralized nervous system.
Collapse
Affiliation(s)
- Ravi D Nath
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA; Howard Hughes Medical Institute
| | - Claire N Bedbrook
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Michael J Abrams
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Ty Basinger
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Justin S Bois
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - David A Prober
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Paul W Sternberg
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA; Howard Hughes Medical Institute
| | - Viviana Gradinaru
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Lea Goentoro
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.
| |
Collapse
|
56
|
Tsukamoto H, Chen IS, Kubo Y, Furutani Y. A ciliary opsin in the brain of a marine annelid zooplankton is ultraviolet-sensitive, and the sensitivity is tuned by a single amino acid residue. J Biol Chem 2017. [PMID: 28623234 DOI: 10.1074/jbc.m117.793539] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Ciliary opsins were classically thought to function only in vertebrates for vision, but they have also been identified recently in invertebrates for non-visual photoreception. Larvae of the annelid Platynereis dumerilii are used as a zooplankton model, and this zooplankton species possesses a "vertebrate-type" ciliary opsin (named c-opsin) in the brain. Platynereis c-opsin is suggested to relay light signals for melatonin production and circadian behaviors. Thus, the spectral and biochemical characteristics of this c-opsin would be directly related to non-visual photoreception in this zooplankton model. Here we demonstrate that the c-opsin can sense UV to activate intracellular signaling cascades and that it can directly bind exogenous all-trans-retinal. These results suggest that this c-opsin regulates circadian signaling in a UV-dependent manner and that it does not require a supply of 11-cis-retinal for photoreception. Avoidance of damaging UV irradiation is a major cause of large-scale daily zooplankton movement, and the observed capability of the c-opsin to transmit UV signals and bind all-trans-retinal is ideally suited for sensing UV radiation in the brain, which presumably lacks enzymes producing 11-cis-retinal. Mutagenesis analyses indicated that a unique amino acid residue (Lys-94) is responsible for c-opsin-mediated UV sensing in the Platynereis brain. We therefore propose that acquisition of the lysine residue in the c-opsin would be a critical event in the evolution of Platynereis to enable detection of ambient UV light. In summary, our findings indicate that the c-opsin possesses spectral and biochemical properties suitable for UV sensing by the zooplankton model.
Collapse
Affiliation(s)
- Hisao Tsukamoto
- Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, Okazaki 444-8585, Japan; Department of Structural Molecular Science, Graduate University for Advanced Studies, Hayama, Kanagawa 240-0193, Japan.
| | - I-Shan Chen
- Division of Biophysics and Neurobiology, Department of Molecular Physiology, National Institute for Physiological Sciences, Okazaki, Aichi 444-8585, Japan; Physiological Sciences, SOKENDAI, Graduate University for Advanced Studies, Hayama, Kanagawa 240-0193, Japan
| | - Yoshihiro Kubo
- Division of Biophysics and Neurobiology, Department of Molecular Physiology, National Institute for Physiological Sciences, Okazaki, Aichi 444-8585, Japan; Physiological Sciences, SOKENDAI, Graduate University for Advanced Studies, Hayama, Kanagawa 240-0193, Japan
| | - Yuji Furutani
- Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, Okazaki 444-8585, Japan; Department of Structural Molecular Science, Graduate University for Advanced Studies, Hayama, Kanagawa 240-0193, Japan
| |
Collapse
|
57
|
Starunov VV, Voronezhskaya EE, Nezlin LP. Development of the nervous system in Platynereis dumerilii (Nereididae, Annelida). Front Zool 2017; 14:27. [PMID: 28559917 PMCID: PMC5445494 DOI: 10.1186/s12983-017-0211-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 05/09/2017] [Indexed: 12/14/2022] Open
Abstract
Background The structure and development of the nervous system in Lophotrochozoa has long been recognized as one of the most important subjects for phylogenetic and evolutionary discussion. Many recent papers have presented comprehensive data on the structure and development of catecholaminergic, serotonergic and FMRFamidergic parts of the nervous system. However, relatively few papers contain detailed descriptions of the nervous system in Annelida, one of the largest taxa of Lophotrochozoa. The polychaete species Platynereis dumerilii has recently become one of the more popular model animals in evolutionary and developmental biology. The goal of the present study was to provide a detailed description of its neuronal development. The data obtained will contribute to a better understanding of the basic features of neuronal development in polychaetes. Results We have studied the development of the nervous system in P. dumerilii utilizing histo- and immunochemical labelling of catecholamines, serotonin, FMRFamide related peptides, and acetylated tubulin. The first neuron differentiates at the posterior extremity of the protrochophore, reacts to the antibodies against both serotonin and FMRFamide. Then its fibres run forwards along the ventral side. Soon, more neurons appear at the apical extreme, and their basal neurites form the basel structure of the developing brain (cerebral neuropil and circumesophageal connectives). Initial development of the nervous system starts in two rudiments: anterior and posterior. At the nectochaete stage, segmental ganglia start to differentiate in the anterior-to-posterior direction, and the first structures of the stomatogastric and peripheral nervous system appear. All connectives including the unpaired ventral cord develop from initially paired nerves. Conclusions We present a detailed description of Platynereis dumerilii neuronal development based on anti-acetylated tubulin, serotonin, and FMRFamide-like immunostaining as well as catecholamine histofluorescence. The development of the nervous system starts from peripheral pioneer neurons at both the posterior and anterior poles of the larva, and their neurites form a scaffold upon which the adult central nervous system develops. The anterior-to-posterior mode of the ventral ganglia development challenges the primary heteronomy concept. Comparison with the development of Mollusca reveals substantial similarities with early neuronal development in larval Solenogastres. Electronic supplementary material The online version of this article (doi:10.1186/s12983-017-0211-3) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Viktor V Starunov
- Department of Invertebrate Zoology, St-Petersburg State University, St-Petersburg, 199034 Russia.,Zoological Institute Rus, Acad. Sci, St-Petersburg, 199034 Russia
| | | | - Leonid P Nezlin
- Institute of Developmental Biology, Rus. Acad. Sci, Moscow, 119991 Russia
| |
Collapse
|
58
|
Mendoza-Vargas L, Báez-Saldaña A, Alvarado R, Fuentes-Pardo B, Flores-Soto E, Solís-Chagoyán H. Circadian rhythm in melatonin release as a mechanism to reinforce the temporal organization of the circadian system in crayfish. INVERTEBRATE NEUROSCIENCE 2017; 17:6. [PMID: 28540583 DOI: 10.1007/s10158-017-0199-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 05/12/2017] [Indexed: 01/25/2023]
Abstract
Melatonin (MEL) is a conserved molecule with respect to its synthesis pathway and functions. In crayfish, MEL content in eyestalks (Ey) increases at night under the photoperiod, and this indoleamine synchronizes the circadian rhythm of electroretinogram amplitude, which is expressed by retinas and controlled by the cerebroid ganglion (CG). The aim of this study was to determine whether MEL content in eyestalks and CG or circulating MEL in hemolymph (He) follows a circadian rhythm under a free-running condition; in addition, it was tested whether MEL might directly influence the spontaneous electrical activity of the CG. Crayfish were maintained under constant darkness and temperature, a condition suitable for studying the intrinsic properties of circadian systems. MEL was quantified in samples obtained from He, Ey, and CG by means of an enzyme-linked immunosorbent assay, and the effect of exogenous MEL on CG spontaneous activity was evaluated by electrophysiological recording. Variation of MEL content in He, Ey, and CG followed a circadian rhythm that peaked at the same circadian time (CT). In addition, a single dose of MEL injected into the crayfish at different CTs reduced the level of spontaneous electrical activity in the CG. Results suggest that the circadian increase in MEL content directly affects the CG, reducing its spontaneous electrical activity, and that MEL might act as a periodical signal to reinforce the organization of the circadian system in crayfish.
Collapse
Affiliation(s)
- Leonor Mendoza-Vargas
- Departamento El Hombre Y Su Ambiente, Universidad Autónoma Metropolitana Unidad Xochimilco, CP 04960, Mexico, Mexico
| | - Armida Báez-Saldaña
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Nueva Sede, Universidad Nacional Autónoma de México, CP 04510, Mexico, Mexico
| | - Ramón Alvarado
- Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, CP 04510, Mexico, Mexico
| | - Beatriz Fuentes-Pardo
- Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, CP 04510, Mexico, Mexico
| | - Edgar Flores-Soto
- Departamento de Farmacología, Facultad de Medicina, Universidad Nacional Autónoma de México, CP 04510, Mexico, Mexico
| | - Héctor Solís-Chagoyán
- Laboratorio de Neurofarmacología, Instituto Nacional de Psiquiatría Ramón de La Fuente Muñiz, CP 14370, Mexico, D.F, Mexico.
| |
Collapse
|
59
|
Verasztó C, Ueda N, Bezares-Calderón LA, Panzera A, Williams EA, Shahidi R, Jékely G. Ciliomotor circuitry underlying whole-body coordination of ciliary activity in the Platynereis larva. eLife 2017; 6. [PMID: 28508746 PMCID: PMC5531833 DOI: 10.7554/elife.26000] [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: 02/13/2017] [Accepted: 05/14/2017] [Indexed: 01/23/2023] Open
Abstract
Ciliated surfaces harbouring synchronously beating cilia can generate fluid flow or drive locomotion. In ciliary swimmers, ciliary beating, arrests, and changes in beat frequency are often coordinated across extended or discontinuous surfaces. To understand how such coordination is achieved, we studied the ciliated larvae of Platynereis dumerilii, a marine annelid. Platynereis larvae have segmental multiciliated cells that regularly display spontaneous coordinated ciliary arrests. We used whole-body connectomics, activity imaging, transgenesis, and neuron ablation to characterize the ciliomotor circuitry. We identified cholinergic, serotonergic, and catecholaminergic ciliomotor neurons. The synchronous rhythmic activation of cholinergic cells drives the coordinated arrests of all cilia. The serotonergic cells are active when cilia are beating. Serotonin inhibits the cholinergic rhythm, and increases ciliary beat frequency. Based on their connectivity and alternating activity, the catecholaminergic cells may generate the rhythm. The ciliomotor circuitry thus constitutes a stop-and-go pacemaker system for the whole-body coordination of ciliary locomotion. DOI:http://dx.doi.org/10.7554/eLife.26000.001 The oceans contain a wide variety of microscopic organisms including bacteria, algae and animal larvae. Many of the microscopic animals that live in water use thousands of beating hair-like projections called cilia instead of muscles to swim around in the water. Understanding how these animals move will aid our understanding of how ocean processes, such as the daily migration of plankton to and from the surface of the water, are regulated. The larvae of a ragworm called Platynereis use cilia to move around. Like other animals, Platynereis has a nervous system containing neurons that form networks to control the body. It is possible that the nervous system is involved in coordinating the activity of the cilia to allow the larvae to manoeuvre in the water, but it was not clear how this could work. Here, Veraszto et al. investigated how Platynereis is able to swim. The experiments show that the larvae can coordinate their cilia so that they all stop beating at the same time and fold into to the body. Then the larvae can stimulate all of their cilia to resume beating. Veraszto et al. used a technique called electron microscopy to study how the nervous system connects to the cilia. This revealed that several giant neurons span the entire length of the larva and connect to cells that bear cilia. When these neurons were active, all the cilia in the body closed. When a different group of neurons in the larva was active, all of the cilia resumed beating. Together, these two groups of neurons were ultimately responsible for the swimming motions of the larvae. Together, the findings of Veraszto et al. show that a few neurons in the nervous system of the larvae provide a sophisticated system for controlling how the larvae swim around. This suggests that the microscopic animals found in marine environments are a lot more sophisticated than previously appreciated. A next challenge is to find out how the neurons that control cilia connect to the rest of the animal’s nervous system and how different cues influence when the larva swims or stops swimming. This would help us understand how the environment influences the distribution of animal larvae in the oceans and how this may change in the future. DOI:http://dx.doi.org/10.7554/eLife.26000.002
Collapse
Affiliation(s)
- Csaba Verasztó
- Max Planck Institute for Developmental Biology, Tübingen, Germany
| | - Nobuo Ueda
- Max Planck Institute for Developmental Biology, Tübingen, Germany
| | | | - Aurora Panzera
- Max Planck Institute for Developmental Biology, Tübingen, Germany
| | | | - Réza Shahidi
- Max Planck Institute for Developmental Biology, Tübingen, Germany
| | - Gáspár Jékely
- Max Planck Institute for Developmental Biology, Tübingen, Germany
| |
Collapse
|
60
|
Ren W, Liu G, Chen S, Yin J, Wang J, Tan B, Wu G, Bazer FW, Peng Y, Li T, Reiter RJ, Yin Y. Melatonin signaling in T cells: Functions and applications. J Pineal Res 2017; 62. [PMID: 28152213 DOI: 10.1111/jpi.12394] [Citation(s) in RCA: 137] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 01/27/2017] [Indexed: 12/21/2022]
Abstract
Melatonin affects a variety of physiological processes including circadian rhythms, cellular redox status, and immune function. Importantly, melatonin significantly influences T-cell-mediated immune responses, which are crucial to protect mammals against cancers and infections, but are associated with pathogenesis of many autoimmune diseases. This review focuses on our current understanding of the significance of melatonin in T-cell biology and the beneficial effects of melatonin in T-cell response-based diseases. In addition to expressing both membrane and nuclear receptors for melatonin, T cells have the four enzymes required for the synthesis of melatonin and produce high levels of melatonin. Meanwhile, melatonin is highly effective in modulating T-cell activation and differentiation, especially for Th17 and Treg cells, and also memory T cells. Mechanistically, the influence of melatonin in T-cell biology is associated with membrane and nuclear receptors as well as receptor-independent pathways, for example, via calcineurin. Several cell signaling pathways, including ERK1/2-C/EBPα, are involved in the regulatory roles of melatonin in T-cell biology. Through modulation in T-cell responses, melatonin exerts beneficial effects in various inflammatory diseases, such as type 1 diabetes, systemic lupus erythematosus, and multiple sclerosis. These findings highlight the importance of melatonin signaling in T-cell fate determination, and T cell-based immune pathologies.
Collapse
Affiliation(s)
- Wenkai Ren
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
- College of Animal Science, South China Agricultural University, Guangzhou, China
- University of the Chinese Academy of Sciences, Beijing, China
| | - Gang Liu
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
| | - Shuai Chen
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
| | - Jie Yin
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
| | - Jing Wang
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
| | - Bie Tan
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
| | - Guoyao Wu
- Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - Fuller W Bazer
- Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - Yuanyi Peng
- Chongqing Key Laboratory of Forage & Herbivore, College of Animal Science and Technology, Southwest University, Chongqing, China
| | - Tiejun Li
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
- Hunan Co-Innovation Center of Animal Production Safety, CICAPS, Changsha, Hunan, China
| | - Russel J Reiter
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX, USA
| | - Yulong Yin
- Laboratory of Animal Nutrition and Health and Key Laboratory of Agro-Ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan, China
- College of Animal Science, South China Agricultural University, Guangzhou, China
- School of Life Science, Hunan Normal University, Changsha, China
| |
Collapse
|
61
|
Liang C, Li A, Yu H, Li W, Liang C, Guo S, Zhang R, Chu C. Melatonin Regulates Root Architecture by Modulating Auxin Response in Rice. FRONTIERS IN PLANT SCIENCE 2017; 8:134. [PMID: 28223997 PMCID: PMC5293752 DOI: 10.3389/fpls.2017.00134] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 01/23/2017] [Indexed: 05/17/2023]
Abstract
It has been suggested that melatonin acts as an important regulator in controlling root growth and development, but the underlying molecular mechanism driving this relationship remains undetermined. In this study, we demonstrated that melatonin acts as a potent molecule to govern root architecture in rice. Treatments with melatonin significantly inhibited embryonic root growth, and promoted lateral root formation and development. Genome-wide expression profiling by RNA-sequencing revealed auxin-related genes were significantly activated under melatonin treatment. Moreover, several transcription factors and candidate cis-regulatory elements involved in root growth and developments, as well as auxin-related processes, were over-represented in both co-up and -down differentially expressed genes, suggesting that melatonin-mediated root growth occurs in an auxin signal pathway-dependent manner. Further, gravitropic response analysis determined that melatonin affects auxin-regulated processes in rice root. These data show that melatonin shapes root architecture by directly or indirectly activating the auxin signaling pathway.
Collapse
Affiliation(s)
- Chengzhen Liang
- Biotechnology Research Institute, Chinese Academy of Agricultural SciencesBeijing, China
| | - Aifu Li
- National Center for Plant Gene Research (Beijing), State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of SciencesBeijing, China
| | - Hua Yu
- National Center for Plant Gene Research (Beijing), State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of SciencesBeijing, China
| | - Wenzhen Li
- National Center for Plant Gene Research (Beijing), State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of SciencesBeijing, China
| | - Chengzhi Liang
- National Center for Plant Gene Research (Beijing), State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of SciencesBeijing, China
| | - Sandui Guo
- Biotechnology Research Institute, Chinese Academy of Agricultural SciencesBeijing, China
| | - Rui Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural SciencesBeijing, China
| | - Chengcai Chu
- National Center for Plant Gene Research (Beijing), State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of SciencesBeijing, China
| |
Collapse
|
62
|
Hu W, Ma Z, Di S, Jiang S, Li Y, Fan C, Yang Y, Wang D. Snapshot: implications for melatonin in endoplasmic reticulum homeostasis. Br J Pharmacol 2016; 173:3431-3442. [PMID: 27759160 PMCID: PMC5120159 DOI: 10.1111/bph.13651] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 09/27/2016] [Accepted: 10/03/2016] [Indexed: 12/13/2022] Open
Abstract
The endoplasmic reticulum (ER) is an important intracellular membranous organelle. Previous studies have demonstrated that the ER is responsible for protein folding and trafficking, lipid synthesis and the maintenance of calcium homeostasis. Interestingly, the morphology and structure of the ER were recently found to be important. Melatonin is a hormone that anticipates the daily onset of darkness in mammals, and it is well known that melatonin acts as an antioxidant by scavenging free radicals and increasing the activity of antioxidant enzymes in the body. Notably, the existing evidence demonstrates that melatonin is involved in ER homeostasis, particularly in the morphology of the ER, indicating a potential protective role of melatonin. This review discusses the existing knowledge regarding the implications for the involvement of melatonin in ER homeostasis.
Collapse
Affiliation(s)
- Wei Hu
- Department of Thoracic and Cardiovascular SurgeryAffiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjingChina
- Department of Biomedical EngineeringThe Fourth Military Medical UniversityXi'anChina
| | - Zhiqiang Ma
- Department of Thoracic SurgeryTangdu Hospital, The Fourth Military Medical UniversityXi'anChina
| | - Shouyin Di
- Department of Thoracic SurgeryTangdu Hospital, The Fourth Military Medical UniversityXi'anChina
| | - Shuai Jiang
- Department of Aerospace MedicineThe Fourth Military Medical UniversityXi'anChina
| | - Yue Li
- Department of Biomedical EngineeringThe Fourth Military Medical UniversityXi'anChina
| | - Chongxi Fan
- Department of Thoracic SurgeryTangdu Hospital, The Fourth Military Medical UniversityXi'anChina
| | - Yang Yang
- Department of Thoracic and Cardiovascular SurgeryAffiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjingChina
- Department of Biomedical EngineeringThe Fourth Military Medical UniversityXi'anChina
| | - Dongjin Wang
- Department of Thoracic and Cardiovascular SurgeryAffiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjingChina
| |
Collapse
|
63
|
Valero-Gracia A, Petrone L, Oliveri P, Nilsson DE, Arnone MI. Non-directional Photoreceptors in the Pluteus of Strongylocentrotus purpuratus. Front Ecol Evol 2016. [DOI: 10.3389/fevo.2016.00127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
|
64
|
Jékely G, Keijzer F, Godfrey-Smith P. An option space for early neural evolution. Philos Trans R Soc Lond B Biol Sci 2016; 370:rstb.2015.0181. [PMID: 26554049 DOI: 10.1098/rstb.2015.0181] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The origin of nervous systems has traditionally been discussed within two conceptual frameworks. Input-output models stress the sensory-motor aspects of nervous systems, while internal coordination models emphasize the role of nervous systems in coordinating multicellular activity, especially muscle-based motility. Here we consider both frameworks and apply them to describe aspects of each of three main groups of phenomena that nervous systems control: behaviour, physiology and development. We argue that both frameworks and all three aspects of nervous system function need to be considered for a comprehensive discussion of nervous system origins. This broad mapping of the option space enables an overview of the many influences and constraints that may have played a role in the evolution of the first nervous systems.
Collapse
Affiliation(s)
- Gáspár Jékely
- Max Planck Institute for Developmental Biology, Spemannstrasse 35, Tübingen 72076, Germany
| | - Fred Keijzer
- Department of Theoretical Philosophy, University of Groningen, Oude Boteringestraat 52, Groningen 9712 GL, The Netherlands
| | - Peter Godfrey-Smith
- Philosophy Program, The Graduate Center, City University of New York, New York, NY 10016, USA History and Philosophy of Science Unit, University of Sydney, Sydney, New South Wales 2006, Australia
| |
Collapse
|
65
|
Towards a systems-level understanding of development in the marine annelid Platynereis dumerilii. Curr Opin Genet Dev 2016; 39:175-181. [PMID: 27501412 DOI: 10.1016/j.gde.2016.07.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 05/30/2016] [Accepted: 07/07/2016] [Indexed: 01/12/2023]
Abstract
Platynereis dumerilii is a segmented marine worm from the phylum Annelida, a member of the Lophotrochozoans. Platynereis is easily maintained in the lab and exhibits a highly stereotypic development through spiral cleavage with a small, transparent, free-swimming larva highly suitable for microscopy studies. A protocol for embryo microinjection in Platynereis has enabled several genetic tools to be developed, paving the way for functional studies. Recent Platynereis studies have provided insights into the function of several signaling pathways in development. Platynereis has also proven a useful model system for comparative evolutionary developmental studies, allowing the formation of new hypotheses on the evolution of neuroendocrine signaling, body patterning, and organ development. Combining existing large datasets of spatial gene expression mapping, cell lineage mapping, and neuronal circuits with functional analyses of developmental genes represents a promising approach for future studies aiming at a systems-level understanding of development in Platynereis.
Collapse
|
66
|
Tan DX, Hardeland R, Back K, Manchester LC, Alatorre-Jimenez MA, Reiter RJ. On the significance of an alternate pathway of melatonin synthesis via 5-methoxytryptamine: comparisons across species. J Pineal Res 2016; 61:27-40. [PMID: 27112772 DOI: 10.1111/jpi.12336] [Citation(s) in RCA: 166] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 04/21/2016] [Indexed: 12/14/2022]
Abstract
Melatonin is a phylogenetically ancient molecule. It is ubiquitously present in almost all organisms from primitive photosynthetic bacteria to humans. Its original primary function is presumable to be that of an antioxidant with other functions of this molecule having been acquired during evolution. The synthetic pathway of melatonin in vertebrates has been extensively studied. It is common knowledge that serotonin is acetylated to form N-acetylserotonin by arylalkylamine N-acetyltransferase (AANAT) or arylamine N-acetyltransferase (SNAT or NAT) and N-acetylserotonin is, subsequently, methylated to melatonin by N-acetylserotonin O-methyltransferase (ASMT; also known as hydroxyindole-O-methyltransferase, HIOMT). This is referred to as a classic melatonin synthetic pathway. Based on new evidence, we feel that this classic melatonin pathway is not generally the prevailing route of melatonin production. An alternate pathway is known to exist, in which serotonin is first O-methylated to 5-methoxytryptamine (5-MT) and, thereafter, 5-MT is N-acetylated to melatonin. Here, we hypothesize that the alternate melatonin synthetic pathway may be more important in certain organisms and under certain conditions. Evidence strongly supports that this alternate pathway prevails in some plants, bacteria, and, perhaps, yeast and may also occur in animals.
Collapse
Affiliation(s)
- Dun-Xian Tan
- Department of Cellular and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Rüdiger Hardeland
- Johann Friedrich Blumenbach Institute of Zoology and Anthropology, University of Göttingen, Göttingen, Germany
| | - Kyoungwhan Back
- Department of Biotechnology, Bioenergy Research Center, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, South Korea
| | - Lucien C Manchester
- Department of Cellular and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Moises A Alatorre-Jimenez
- Department of Cellular and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Russel J Reiter
- Department of Cellular and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| |
Collapse
|
67
|
Helm C, Vöcking O, Kourtesis I, Hausen H. Owenia fusiformis - a basally branching annelid suitable for studying ancestral features of annelid neural development. BMC Evol Biol 2016; 16:129. [PMID: 27306767 PMCID: PMC4910202 DOI: 10.1186/s12862-016-0690-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 05/23/2016] [Indexed: 12/15/2022] Open
Abstract
Background Comparative investigations on bilaterian neurogenesis shed light on conserved developmental mechanisms across taxa. With respect to annelids, most studies focus on taxa deeply nested within the annelid tree, while investigations on early branching groups are almost lacking. According to recent phylogenomic data on annelid evolution Oweniidae represent one of the basally branching annelid clades. Oweniids are thought to exhibit several plesiomorphic characters, but are scarcely studied - a fact that might be caused by the unique morphology and unusual metamorphosis of the mitraria larva, which seems to be hardly comparable to other annelid larva. In our study, we compare the development of oweniid neuroarchitecture with that of other annelids aimed to figure out whether oweniids may represent suitable study subjects to unravel ancestral patterns of annelid neural development. Our study provides the first data on nervous system development in basally branching annelids. Results Based on histology, electron microscopy and immunohistochemical investigations we show that development and metamorphosis of the mitraria larva has many parallels to other annelids irrespective of the drastic changes in body shape during metamorphosis. Such significant changes ensuing metamorphosis are mainly from diminution of a huge larval blastocoel and not from major restructuring of body organization. The larval nervous system features a prominent apical organ formed by flask-shaped perikarya and circumesophageal connectives that interconnect the apical and trunk nervous systems, in addition to serially arranged clusters of perikarya showing 5-HT-LIR in the ventral nerve cord, and lateral nerves. Both 5-HT-LIR and FMRFamide-LIR are present in a distinct nerve ring underlying the equatorial ciliary band. The connections arising from these cells innervate the circumesophageal connectives as well as the larval brain via dorsal and ventral neurites. Notably, no distinct somata with 5-HT -LIR in the apical organ are detectable in the larval stages of Owenia. Most of the larval neural elements including parts of the apical organ are preserved during metamorphosis and contribute to the juvenile nervous system. Conclusions Our studies in Owenia fusiformis strongly support that early branching annelids are comparable to other annelids with regard to larval neuroanatomy and formation of the juvenile nervous system. Therefore, Owenia fusiformis turns out to be a valuable study subject for comparative investigations and unravelling ancestral processes in neural development in Annelida and Bilateria in general. Electronic supplementary material The online version of this article (doi:10.1186/s12862-016-0690-4) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Conrad Helm
- Sars - International Centre for Marine Molecular Biology, University of Bergen, Thormøhlensgt. 55, Bergen, N-5008, Norway.
| | - Oliver Vöcking
- Sars - International Centre for Marine Molecular Biology, University of Bergen, Thormøhlensgt. 55, Bergen, N-5008, Norway
| | - Ioannis Kourtesis
- Sars - International Centre for Marine Molecular Biology, University of Bergen, Thormøhlensgt. 55, Bergen, N-5008, Norway
| | - Harald Hausen
- Sars - International Centre for Marine Molecular Biology, University of Bergen, Thormøhlensgt. 55, Bergen, N-5008, Norway
| |
Collapse
|
68
|
Svechtarova MI, Buzzacchera I, Toebes BJ, Lauko J, Anton N, Wilson CJ. Sensor Devices Inspired by the Five Senses: A Review. ELECTROANAL 2016. [DOI: 10.1002/elan.201600047] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
| | | | - B. Jelle Toebes
- NovioSense BV; Transistorweg 5 6534 AT Nijmegen The Netherlands
| | - Jan Lauko
- NovioSense BV; Transistorweg 5 6534 AT Nijmegen The Netherlands
| | - Nicoleta Anton
- Universitatea de Medicina si Farmacie Grigore T.; Popa, Str. Universitatii nr. 16 700115 Iasi Romania
| | | |
Collapse
|
69
|
Arendt D, Tosches MA, Marlow H. From nerve net to nerve ring, nerve cord and brain--evolution of the nervous system. Nat Rev Neurosci 2016; 17:61-72. [PMID: 26675821 DOI: 10.1038/nrn.2015.15] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The puzzle of how complex nervous systems emerged remains unsolved. Comparative studies of neurodevelopment in cnidarians and bilaterians suggest that this process began with distinct integration centres that evolved on opposite ends of an initial nerve net. The 'apical nervous system' controlled general body physiology, and the 'blastoporal nervous system' coordinated feeding movements and locomotion. We propose that expansion, integration and fusion of these centres gave rise to the bilaterian nerve cord and brain.
Collapse
Affiliation(s)
- Detlev Arendt
- Developmental Biology Unit, European Molecular Biology Laboratory, Meyerhofstrasse 1, 699117 Heidelberg, Germany
| | - Maria Antonietta Tosches
- Max Planck Institute for Brain Research, Max-von-Laue-Strasse 4, 60438 Frankfurt am Main, Germany
| | - Heather Marlow
- Pasteur Institute, 25-28 Rue du Dr Roux, 75015 Paris, France
| |
Collapse
|
70
|
Neurotrophin, p75, and Trk Signaling Module in the Developing Nervous System of the Marine Annelid Platynereis dumerilii. BIOMED RESEARCH INTERNATIONAL 2016; 2016:2456062. [PMID: 27069919 PMCID: PMC4812194 DOI: 10.1155/2016/2456062] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/30/2015] [Accepted: 12/01/2015] [Indexed: 01/19/2023]
Abstract
In vertebrates, neurotrophic signaling plays an important role in neuronal development, neural circuit formation, and neuronal plasticity, but its evolutionary origin remains obscure. We found and validated nucleotide sequences encoding putative neurotrophic ligands (neurotrophin, NT) and receptors (Trk and p75) in two annelids, Platynereis dumerilii (Errantia) and Capitella teleta (Sedentaria, for which some sequences were found recently by Wilson, 2009). Predicted protein sequences and structures of Platynereis neurotrophic molecules reveal a high degree of conservation with the vertebrate counterparts; some amino acids signatures present in the annelid Trk sequences are absent in the basal chordate amphioxus, reflecting secondary loss in the cephalochordate lineage. In addition, expression analysis of NT, Trk, and p75 during Platynereis development by whole-mount mRNA in situ hybridization supports a role of these molecules in nervous system and circuit development. These annelid data corroborate the hypothesis that the neurotrophic signaling and its involvement in shaping neural networks predate the protostome-deuterostome split and were present in bilaterian ancestors.
Collapse
|
71
|
Cook CE, Chenevert J, Larsson TA, Arendt D, Houliston E, Lénárt P. Old knowledge and new technologies allow rapid development of model organisms. Mol Biol Cell 2016; 27:882-7. [PMID: 26976934 PMCID: PMC4791132 DOI: 10.1091/mbc.e15-10-0682] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 01/08/2016] [Accepted: 01/13/2016] [Indexed: 12/01/2022] Open
Abstract
Until recently the set of "model" species used commonly for cell biology was limited to a small number of well-understood organisms, and developing a new model was prohibitively expensive or time-consuming. With the current rapid advances in technology, in particular low-cost high-throughput sequencing, it is now possible to develop molecular resources fairly rapidly. Wider sampling of biological diversity can only accelerate progress in addressing cellular mechanisms and shed light on how they are adapted to varied physiological contexts. Here we illustrate how historical knowledge and new technologies can reveal the potential of nonconventional organisms, and we suggest guidelines for selecting new experimental models. We also present examples of nonstandard marine metazoan model species that have made important contributions to our understanding of biological processes.
Collapse
Affiliation(s)
- Charles E Cook
- European Bioinformatics Institute, European Molecular Biology Laboratory, Wellcome Genome Campus, Hinxton CB10 1SD, United Kingdom
| | - Janet Chenevert
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Biologie du Développement de Villefranche-sur-mer, 06230 Villefranche-sur-mer, France
| | - Tomas A Larsson
- Developmental Biology Unit, European Molecular Biology Laboratory, 69117 Heidelberg, Germany
| | - Detlev Arendt
- Developmental Biology Unit, European Molecular Biology Laboratory, 69117 Heidelberg, Germany
| | - Evelyn Houliston
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Biologie du Développement de Villefranche-sur-mer, 06230 Villefranche-sur-mer, France
| | - Péter Lénárt
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory, 69117 Heidelberg, Germany
| |
Collapse
|
72
|
Lennox RJ, Chapman JM, Souliere CM, Tudorache C, Wikelski M, Metcalfe JD, Cooke SJ. Conservation physiology of animal migration. CONSERVATION PHYSIOLOGY 2016; 4:cov072. [PMID: 27293751 PMCID: PMC4772791 DOI: 10.1093/conphys/cov072] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 12/09/2015] [Accepted: 12/24/2015] [Indexed: 05/21/2023]
Abstract
Migration is a widespread phenomenon among many taxa. This complex behaviour enables animals to exploit many temporally productive and spatially discrete habitats to accrue various fitness benefits (e.g. growth, reproduction, predator avoidance). Human activities and global environmental change represent potential threats to migrating animals (from individuals to species), and research is underway to understand mechanisms that control migration and how migration responds to modern challenges. Focusing on behavioural and physiological aspects of migration can help to provide better understanding, management and conservation of migratory populations. Here, we highlight different physiological, behavioural and biomechanical aspects of animal migration that will help us to understand how migratory animals interact with current and future anthropogenic threats. We are in the early stages of a changing planet, and our understanding of how physiology is linked to the persistence of migratory animals is still developing; therefore, we regard the following questions as being central to the conservation physiology of animal migrations. Will climate change influence the energetic costs of migration? Will shifting temperatures change the annual clocks of migrating animals? Will anthropogenic influences have an effect on orientation during migration? Will increased anthropogenic alteration of migration stopover sites/migration corridors affect the stress physiology of migrating animals? Can physiological knowledge be used to identify strategies for facilitating the movement of animals? Our synthesis reveals that given the inherent challenges of migration, additional stressors derived from altered environments (e.g. climate change, physical habitat alteration, light pollution) or interaction with human infrastructure (e.g. wind or hydrokinetic turbines, dams) or activities (e.g. fisheries) could lead to long-term changes to migratory phenotypes. However, uncertainty remains because of the complexity of biological systems, the inherently dynamic nature of the environment and the scale at which many migrations occur and associated threats operate, necessitating improved integration of physiological approaches to the conservation of migratory animals.
Collapse
Affiliation(s)
- Robert J. Lennox
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6
| | - Jacqueline M. Chapman
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6
| | - Christopher M. Souliere
- Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6
| | - Christian Tudorache
- The Sylvius Laboratory, Institute of Biology, Leiden University, Sylviusweg 72, Leiden 2333 BE, The Netherlands
| | - Martin Wikelski
- Department of Migration and Immuno-ecology, Max-Planck Institute for Ornithology, Radolfzell, Germany
- Department of Biology, University of Konstanz, Konstanz, Germany
| | - Julian D. Metcalfe
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Lowestoft Laboratory, Suffolk NR33 0HT, UK
| | - Steven J. Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6
- Institute of Environmental Science, Carleton University, Ottawa, ON, Canada K1S 5B6
| |
Collapse
|
73
|
Lück S, Westermark PO. Circadian mRNA expression: insights from modeling and transcriptomics. Cell Mol Life Sci 2016; 73:497-521. [PMID: 26496725 PMCID: PMC11108398 DOI: 10.1007/s00018-015-2072-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 10/13/2015] [Accepted: 10/14/2015] [Indexed: 01/08/2023]
Abstract
Circadian clocks synchronize organisms to the 24 h rhythms of the environment. These clocks persist under constant conditions, have their origin at the cellular level, and produce an output of rhythmic mRNA expression affecting thousands of transcripts in many mammalian cell types. Here, we review the charting of circadian output rhythms in mRNA expression, focusing on mammals. We emphasize the challenges in statistics, interpretation, and quantitative descriptions that such investigations have faced and continue to face, and outline remaining outstanding questions.
Collapse
Affiliation(s)
- Sarah Lück
- Institute for Theoretical Biology, Charité - Universitätsmedizin Berlin, Invalidenstrasse 43, 10115, Berlin, Germany
| | - Pål O Westermark
- Institute for Theoretical Biology, Charité - Universitätsmedizin Berlin, Invalidenstrasse 43, 10115, Berlin, Germany.
| |
Collapse
|
74
|
Clock-Talk: Interactions between Central and Peripheral Circadian Oscillators in Mammals. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 2015; 80:223-32. [PMID: 26683231 DOI: 10.1101/sqb.2015.80.027490] [Citation(s) in RCA: 194] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
In mammals, including humans, nearly all physiological processes are subject to daily oscillations that are governed by a circadian timing system with a complex hierarchical structure. The central pacemaker, residing in the suprachiasmatic nucleus (SCN) of the ventral hypothalamus, is synchronized daily by photic cues transmitted from the retina to SCN neurons via the retinohypothalamic tract. In turn, the SCN must establish phase coherence between self-sustained and cell-autonomous oscillators present in most peripheral cell types. The synchronization signals (Zeitgebers) can be controlled more or less directly by the SCN. In mice and rats, feeding-fasting rhythms, which are driven by the SCN through rest-activity cycles, are the most potent Zeitgebers for the circadian oscillators of peripheral organs. Signaling through the glucocorticoid receptor and the serum response factor also participate in the phase entrainment of peripheral clocks, and these two pathways are controlled by the SCN independently of feeding-fasting rhythms. Body temperature rhythms, governed by the SCN directly and indirectly through rest-activity cycles, are perhaps the most surprising cues for peripheral oscillators. Although the molecular makeup of circadian oscillators is nearly identical in all cells, these oscillators are used for different purposes in the SCN and in peripheral organs.
Collapse
|
75
|
Shahidi R, Williams EA, Conzelmann M, Asadulina A, Verasztó C, Jasek S, Bezares-Calderón LA, Jékely G. A serial multiplex immunogold labeling method for identifying peptidergic neurons in connectomes. eLife 2015; 4. [PMID: 26670546 PMCID: PMC4749568 DOI: 10.7554/elife.11147] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 11/27/2015] [Indexed: 02/07/2023] Open
Abstract
Electron microscopy-based connectomics aims to comprehensively map synaptic connections in neural tissue. However, current approaches are limited in their capacity to directly assign molecular identities to neurons. Here, we use serial multiplex immunogold labeling (siGOLD) and serial-section transmission electron microscopy (ssTEM) to identify multiple peptidergic neurons in a connectome. The high immunogenicity of neuropeptides and their broad distribution along axons, allowed us to identify distinct neurons by immunolabeling small subsets of sections within larger series. We demonstrate the scalability of siGOLD by using 11 neuropeptide antibodies on a full-body larval ssTEM dataset of the annelid Platynereis. We also reconstruct a peptidergic circuitry comprising the sensory nuchal organs, found by siGOLD to express pigment-dispersing factor, a circadian neuropeptide. Our approach enables the direct overlaying of chemical neuromodulatory maps onto synaptic connectomic maps in the study of nervous systems. DOI:http://dx.doi.org/10.7554/eLife.11147.001 In the nervous system, cells called neurons connect to each other to form large “neural” networks. The most powerful method that is currently available for tracing neurons and mapping the connections between them is called electron microscopy. This requires slicing brain tissue into ultrathin sections, which are then imaged one by one. However, while electron microscopy provides highly detailed information about the structure of the connections between neurons, it does not reveal which molecules the neurons use to communicate with each other. To address this question, Shahidi et al. have developed a new approach called ‘siGOLD’. Unlike previous approaches, siGOLD allows signal molecules inside cells to be labeled with protein tags called antibodies without compromising the ability to examine the tissue with electron microscopy. The technique was developed using the larvae of a marine worm called Platynereis. A single larva was sliced into 5000 sections thin enough to view under an electron microscope, and 150 of these were selected to represent the entire body. Because neurons are typically long and thin, individual neurons usually spanned multiple slices. To identify the neurons, Shahidi et al. then applied an antibody that recognizes a specific signal molecule to a subset of the slices. The antibodies were labeled with gold particles, which show up as black dots under the electron microscope. Because the molecules recognized by the antibodies are present all along the neuron, and because individual neurons extend over multiple slices, it was possible to trace single neurons by labeling only a small number of slices. Repeating this process in different subsets of slices with antibodies that bind to different signal molecules allowed entire neural circuits to be mapped. In the future, Shahidi et al.’s approach could be adapted to study neural networks in other organisms such as flies, fish and mice. DOI:http://dx.doi.org/10.7554/eLife.11147.002
Collapse
Affiliation(s)
- Réza Shahidi
- Max-Planck-Institute for Developmental Biology, Tübingen, Germany
| | | | | | - Albina Asadulina
- Max-Planck-Institute for Developmental Biology, Tübingen, Germany
| | - Csaba Verasztó
- Max-Planck-Institute for Developmental Biology, Tübingen, Germany
| | - Sanja Jasek
- Max-Planck-Institute for Developmental Biology, Tübingen, Germany
| | | | - Gáspár Jékely
- Max-Planck-Institute for Developmental Biology, Tübingen, Germany
| |
Collapse
|
76
|
Tan DX, Manchester LC, Esteban-Zubero E, Zhou Z, Reiter RJ. Melatonin as a Potent and Inducible Endogenous Antioxidant: Synthesis and Metabolism. Molecules 2015; 20:18886-906. [PMID: 26501252 PMCID: PMC6332205 DOI: 10.3390/molecules201018886] [Citation(s) in RCA: 381] [Impact Index Per Article: 42.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 10/08/2015] [Accepted: 10/09/2015] [Indexed: 11/17/2022] Open
Abstract
Melatonin is a tryptophan-derived molecule with pleiotropic activities. It is present in almost all or all organisms. Its synthetic pathway depends on the species in which it is measured. For example, the tryptophan to melatonin pathway differs in plants and animals. It is speculated that the melatonin synthetic machinery in eukaryotes was inherited from bacteria as a result of endosymbiosis. However, melatonin's synthetic mechanisms in microorganisms are currently unknown. Melatonin metabolism is highly complex with these enzymatic processes having evolved from cytochrome C. In addition to its enzymatic degradation, melatonin is metabolized via pseudoenzymatic and free radical interactive processes. The metabolic products of these processes overlap and it is often difficult to determine which process is dominant. However, under oxidative stress, the free radical interactive pathway may be featured over the others. Because of the complexity of the melatonin degradative processes, it is expected that additional novel melatonin metabolites will be identified in future investigations. The original and primary function of melatonin in early life forms such as in unicellular organisms was as a free radical scavenger and antioxidant. During evolution, melatonin was selected as a signaling molecule to transduce the environmental photoperiodic information into an endocrine message in multicellular organisms and for other purposes as well. As an antioxidant, melatonin exhibits several unique features which differ from the classic antioxidants. These include its cascade reaction with free radicals and its capacity to be induced under moderate oxidative stress. These features make melatonin a potent endogenously-occurring antioxidant that protects organisms from catastrophic oxidative stress.
Collapse
Affiliation(s)
- Dun-Xian Tan
- Department of Cellular and Structural Biology, Health Science Center, University of Texas, San Antonio, TX 78229, USA.
| | - Lucien C Manchester
- Department of Cellular and Structural Biology, Health Science Center, University of Texas, San Antonio, TX 78229, USA.
| | - Eduardo Esteban-Zubero
- Department of Cellular and Structural Biology, Health Science Center, University of Texas, San Antonio, TX 78229, USA.
| | - Zhou Zhou
- Department of Cellular and Structural Biology, Health Science Center, University of Texas, San Antonio, TX 78229, USA.
| | - Russel J Reiter
- Department of Cellular and Structural Biology, Health Science Center, University of Texas, San Antonio, TX 78229, USA.
| |
Collapse
|
77
|
Gühmann M, Jia H, Randel N, Verasztó C, Bezares-Calderón LA, Michiels NK, Yokoyama S, Jékely G. Spectral Tuning of Phototaxis by a Go-Opsin in the Rhabdomeric Eyes of Platynereis. Curr Biol 2015; 25:2265-71. [PMID: 26255845 DOI: 10.1016/j.cub.2015.07.017] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 05/26/2015] [Accepted: 07/07/2015] [Indexed: 11/30/2022]
Abstract
Phototaxis is characteristic of the pelagic larval stage of most bottom-dwelling marine invertebrates. Larval phototaxis is mediated by simple eyes that can express various types of light-sensitive G-protein-coupled receptors known as opsins. Since opsins diversified early during metazoan evolution in the marine environment, understanding underwater light detection could elucidate this diversification. Opsins have been classified into three major families, the r-opsins, the c-opsins, and the Go/RGR opsins, a family uniting Go-opsins, retinochromes, RGR opsins, and neuropsins. The Go-opsins form an ancient and poorly characterized group retained only in marine invertebrate genomes. Here, we characterize a Go-opsin from the marine annelid Platynereis dumerilii. We found Go-opsin1 coexpressed with two r-opsins in depolarizing rhabdomeric photoreceptor cells in the pigmented eyes of Platynereis larvae. We purified recombinant Go-opsin1 and found that it absorbs in the blue-cyan range of the light spectrum. To characterize the function of Go-opsin1, we generated a Go-opsin1 knockout Platynereis line by zinc-finger-nuclease-mediated genome engineering. Go-opsin1 knockout larvae were phototactic but showed reduced efficiency of phototaxis to wavelengths matching the in vitro Go-opsin1 spectrum. Our results highlight spectral tuning of phototaxis as a potential mechanism contributing to opsin diversity.
Collapse
Affiliation(s)
- Martin Gühmann
- Max Planck Institute for Developmental Biology, Spemannstraße 35, 72076 Tübingen, Germany
| | - Huiyong Jia
- Department of Biology, Emory University, 1510 Clifton Road, Atlanta, GA 30322, USA
| | - Nadine Randel
- Max Planck Institute for Developmental Biology, Spemannstraße 35, 72076 Tübingen, Germany
| | - Csaba Verasztó
- Max Planck Institute for Developmental Biology, Spemannstraße 35, 72076 Tübingen, Germany
| | | | - Nico K Michiels
- Department of Biology, University of Tübingen, 72076 Tübingen, Germany
| | - Shozo Yokoyama
- Department of Biology, Emory University, 1510 Clifton Road, Atlanta, GA 30322, USA
| | - Gáspár Jékely
- Max Planck Institute for Developmental Biology, Spemannstraße 35, 72076 Tübingen, Germany.
| |
Collapse
|
78
|
Ivashkin E, Khabarova MY, Melnikova V, Nezlin LP, Kharchenko O, Voronezhskaya EE, Adameyko I. Serotonin Mediates Maternal Effects and Directs Developmental and Behavioral Changes in the Progeny of Snails. Cell Rep 2015; 12:1144-58. [PMID: 26257175 DOI: 10.1016/j.celrep.2015.07.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 05/27/2015] [Accepted: 07/13/2015] [Indexed: 10/23/2022] Open
Abstract
Many organisms survive in constantly changing environments, including cycling seasons. Developing embryos show remarkable instant adaptations to the variable environmental challenges they encounter during their adult life, despite having no direct contact with the changing environment until after birth or hatching. The mechanisms by which such non-genetic information is transferred to the developing embryos are largely unknown. Here, we address this question by using a freshwater pond snail (Lymnaea stagnalis) as a model system. This snail normally lives in a seasonal climate, and the seasons define its locomotion, feeding, and reproductive behavior. We discovered that the serotonergic system plays a crucial role in transmitting a non-genetic instructive signal from mother to progeny. This maternal serotonin-based signal functions in embryos during a short time window at exclusively early pre-neural developmental stages and modulates the dynamics of embryonic and juvenile growth, feeding behavior, and locomotion.
Collapse
Affiliation(s)
- Evgeny Ivashkin
- Department of Experimental Neurocytology, Brain Research Branch, Scientific Center of Neurology, Russian Academy of Medical Sciences, 105064 Moscow, Russia; Department of Physiology and Pharmacology, Karolinska Institutet, 17177 Solna, Sweden
| | - Marina Yu Khabarova
- Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia
| | - Victoria Melnikova
- Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia
| | - Leonid P Nezlin
- Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia
| | - Olga Kharchenko
- Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia
| | - Elena E Voronezhskaya
- Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia.
| | - Igor Adameyko
- Department of Physiology and Pharmacology, Karolinska Institutet, 17177 Solna, Sweden; Department of Molecular Neurosciences, Center of Brain Research, Medical University of Vienna, 1090 Vienna, Austria.
| |
Collapse
|
79
|
Large-Scale Combinatorial Deorphanization of Platynereis Neuropeptide GPCRs. Cell Rep 2015; 12:684-93. [DOI: 10.1016/j.celrep.2015.06.052] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 05/27/2015] [Accepted: 06/12/2015] [Indexed: 12/17/2022] Open
|
80
|
Agomelatine or ramelteon as treatment adjuncts in glioblastoma and other M1- or M2-expressing cancers. Contemp Oncol (Pozn) 2015; 19:157-62. [PMID: 26034396 PMCID: PMC4444449 DOI: 10.5114/wo.2015.51421] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 02/05/2015] [Accepted: 03/09/2015] [Indexed: 01/25/2023] Open
Abstract
The impressive but sad list of over forty clinical studies using various cytotoxic chemotherapies published in the last few years has failed to increase median survival of glioblastoma beyond two years after diagnosis. In view of this apparent brick wall, adjunctive non-cytotoxic growth factor blocking drugs are being tried, as in the CUSP9* protocol. A related theme is searching for agonists at growth inhibiting receptors. One such dataset is that of melatonin agonism at M1 or M2 receptors found on glioblastoma cells, being a negative regulator of these cells’ growth. Melatonin itself is an endogenous hormone, but when used as an exogenously administered drug it has many disadvantages. Agomelatine, marketed as an antidepressant, and ramelteon, marketed as a treatment for insomnia, are currently-available melatonin receptor agonists. These melatonin receptor agonists have significant advantages over the natural ligand: longer half-life, better oral absorption, and higher affinity to melatonin receptors. They have an eminently benign side effect profile. As full agonists they should function to inhibit glioblastoma growth, as demonstrated for melatonin. A potentially helpful ancillary attribute of melatonergic agonists in glioblastoma treatment is an increase in interleukin-2 synthesis, expected, at least partially, to reverse some of the immunosuppression associated with glioblastoma.
Collapse
|
81
|
Abstract
Tosches et al. show that melatonin signaling regulates circadian swimming in annelid worms by rhythmically activating cholinergic neurons. This suggests an evolutionary connection between melatonin signaling in invertebrates and sleep regulation in vertebrates.
Collapse
Affiliation(s)
- Klaske J Schippers
- Department of Biological Sciences, University of Denver, Denver, CO 80208, USA
| | - Scott A Nichols
- Department of Biological Sciences, University of Denver, Denver, CO 80208, USA.
| |
Collapse
|
82
|
High-throughput spatial mapping of single-cell RNA-seq data to tissue of origin. Nat Biotechnol 2015; 33:503-9. [PMID: 25867922 DOI: 10.1038/nbt.3209] [Citation(s) in RCA: 278] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 03/13/2015] [Indexed: 01/12/2023]
Abstract
Understanding cell type identity in a multicellular organism requires the integration of gene expression profiles from individual cells with their spatial location in a particular tissue. Current technologies allow whole-transcriptome sequencing of spatially identified cells but lack the throughput needed to characterize complex tissues. Here we present a high-throughput method to identify the spatial origin of cells assayed by single-cell RNA-sequencing within a tissue of interest. Our approach is based on comparing complete, specificity-weighted mRNA profiles of a cell with positional gene expression profiles derived from a gene expression atlas. We show that this method allocates cells to precise locations in the brain of the marine annelid Platynereis dumerilii with a success rate of 81%. Our method is applicable to any system that has a reference gene expression database of sufficiently high resolution.
Collapse
|
83
|
Ancient roots of daily rhythm. Nature 2014. [DOI: 10.1038/514009d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|