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Lin Z, Shen S, Wang K, Ji T. Biotic and abiotic stresses on honeybee health. Integr Zool 2024; 19:442-457. [PMID: 37427560 DOI: 10.1111/1749-4877.12752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Honeybees are the most critical pollinators providing key ecosystem services that underpin crop production and sustainable agriculture. Amidst a backdrop of rapid global change, this eusocial insect encounters a succession of stressors during nesting, foraging, and pollination. Ectoparasitic mites, together with vectored viruses, have been recognized as central biotic threats to honeybee health, while the spread of invasive giant hornets and small hive beetles also increasingly threatens colonies worldwide. Cocktails of agrochemicals, including acaricides used for mite treatment, and other pollutants of the environment have been widely documented to affect bee health in various ways. Additionally, expanding urbanization, climate change, and agricultural intensification often result in the destruction or fragmentation of flower-rich bee habitats. The anthropogenic pressures exerted by beekeeping management practices affect the natural selection and evolution of honeybees, and colony translocations facilitate alien species invasion and disease transmission. In this review, the multiple biotic and abiotic threats and their interactions that potentially undermine bee colony health are discussed, while taking into consideration the sensitivity, large foraging area, dense network among related nestmates, and social behaviors of honeybees.
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Affiliation(s)
- Zheguang Lin
- Apicultural Research Institute, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Siyi Shen
- Apicultural Research Institute, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Kang Wang
- Apicultural Research Institute, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Ting Ji
- Apicultural Research Institute, College of Animal Science and Technology, Yangzhou University, Yangzhou, China
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2
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Nikulin SL, Hesketh-Best PJ, Mckeown DA, Spivak M, Schroeder DC. A semi-automated and high-throughput approach for the detection of honey bee viruses in bee samples. PLoS One 2024; 19:e0297623. [PMID: 38483922 PMCID: PMC10939240 DOI: 10.1371/journal.pone.0297623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 01/10/2024] [Indexed: 03/17/2024] Open
Abstract
Deformed wing virus (DWV) was first detected in dead honey bees in 1982 but has been in honey bees for at least 300 years. Due to its high prevalence and virulence, they have been linked with the ongoing decline in honey bee populations worldwide. A rapid, simple, semi-automated, high-throughput, and cost-effective method of screening colonies for viruses would benefit bee research and the beekeeping industry. Here we describe a semi-automated approach that combines an RNA-grade liquid homogenizer followed by magnetic bead capture for total virus nucleic acid extraction. We compare it to the more commonly applied nucleic acid column-based purification method and use qPCR plus Oxford Nanopore Technologies sequencing to evaluate the accuracy of analytical results for both methods. Our results showed high reproducibility and accuracy for both approaches. The semi-automated method described here allows for faster screening of viral loads in units of 96 samples at a time. We developed this method to monitor viral loads in honey bee colonies, but it could be easily applied for any PCR or genomic-based screening assays.
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Affiliation(s)
- Sofia Levin Nikulin
- Department of Entomology, University of Minnesota, Saint Paul, Minnesota, United States of America
| | - Poppy J. Hesketh-Best
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, United States of America
| | - Dean A. Mckeown
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, United States of America
| | - Marla Spivak
- Department of Entomology, University of Minnesota, Saint Paul, Minnesota, United States of America
| | - Declan C. Schroeder
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, United States of America
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3
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Wu K, Ortgiesen GJ, Goodman CL, Bonning BC. Optimized conditions for the long-term growth of primary cell cultures derived from the Asian citrus psyllid, Diaphorina citri (Liviidae: Hemiptera). In Vitro Cell Dev Biol Anim 2023:10.1007/s11626-023-00765-3. [PMID: 37084043 DOI: 10.1007/s11626-023-00765-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 04/03/2023] [Indexed: 04/22/2023]
Abstract
The Asian citrus psyllid (ACP), Diaphorina citri Kuwayama (Hemiptera: Liviidae), is a pest of significant importance to global citrus production, particularly as the vector of a phloem-limited bacterium Candidatus Liberibacter asiaticus (CLas) that causes the fatal citrus disease Huanglongbing or citrus greening. CLas is acquired as the psyllid feeds, replicates in ACP tissues, and persists throughout the life of the insect. The study of CLas has been hampered by the lack of a tractable in vitro culture system. As CLas replicates within psyllid tissues, we hypothesize that this bacterium also replicates in cultured ACP cells. In the current study, we evaluated a range of insect cell culture media, media combinations, and supplements for their ability to support the in vitro growth of ACP embryo-derived cells. Ninety-six primary cell cultures were initiated using approximately 12,000 dissected ACP eggs over a 12-month period. Of 19 media tested, 17 supported cell attachment, but only two media supported the long-term survival and growth of ACP embryonic cells over a period of more than 11 months. Delineation of the optimal protocols and conditions for the maintenance of ACP primary cultures as described here provides a foundation for both establishment of continuous cell lines and testing for the replication of ACP-associated pathogens including CLas.
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Affiliation(s)
- Ke Wu
- Department of Entomology and Nematology, University of Florida, Gainesville, FL, 32611, USA
| | - Grace J Ortgiesen
- Department of Entomology and Nematology, University of Florida, Gainesville, FL, 32611, USA
| | | | - Bryony C Bonning
- Department of Entomology and Nematology, University of Florida, Gainesville, FL, 32611, USA.
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4
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Karlikow M, Amalfitano E, Yang X, Doucet J, Chapman A, Mousavi PS, Homme P, Sutyrina P, Chan W, Lemak S, Yakunin AF, Dolezal AG, Kelley S, Foster LJ, Harpur BA, Pardee K. CRISPR-induced DNA reorganization for multiplexed nucleic acid detection. Nat Commun 2023; 14:1505. [PMID: 36932065 PMCID: PMC10022571 DOI: 10.1038/s41467-023-36874-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 02/17/2023] [Indexed: 03/19/2023] Open
Abstract
Nucleic acid sensing powered by the sequence recognition of CRIPSR technologies has enabled major advancement toward rapid, accurate and deployable diagnostics. While exciting, there are still many challenges facing their practical implementation, such as the widespread need for a PAM sequence in the targeted nucleic acid, labile RNA inputs, and limited multiplexing. Here we report FACT (Functionalized Amplification CRISPR Tracing), a CRISPR-based nucleic acid barcoding technology compatible with Cas12a and Cas13a, enabling diagnostic outputs based on cis- and trans-cleavage from any sequence. Furthermore, we link the activation of CRISPR-Cas12a to the expression of proteins through a Reprogrammable PAIRing system (RePAIR). We then combine FACT and RePAIR to create FACTOR (FACT on RePAIR), a CRISPR-based diagnostic, that we use to detect infectious disease in an agricultural use case: honey bee viral infection. With high specificity and accuracy, we demonstrate the potential of FACTOR to be applied to the sensing of any nucleic acid of interest.
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Affiliation(s)
- Margot Karlikow
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada.
| | - Evan Amalfitano
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
| | - Xiaolong Yang
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
| | - Jennifer Doucet
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
| | - Abigail Chapman
- Department of Biochemistry & Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Peivand Sadat Mousavi
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
| | - Paige Homme
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
| | - Polina Sutyrina
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
| | - Winston Chan
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
| | - Sofia Lemak
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, M5S 3E5, Canada
| | - Alexander F Yakunin
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, M5S 3E5, Canada
- Centre for Environmental Biotechnology, School of Natural Sciences, Bangor University, Bangor, Gwynedd, LL57 2UW, UK
| | - Adam G Dolezal
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Shana Kelley
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada
- Institute of Biomedical Engineering, University of Toronto, Toronto, ON, M5S 3G9, Canada
- Department of Chemistry, Faculty of Arts and Science, University of Toronto, Toronto, ON, M5S 3H4, Canada
- Department of Biochemistry and Molecular Genetics, Northwestern University, Chicago, IL, 60611, USA
- Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Leonard J Foster
- Department of Biochemistry & Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Brock A Harpur
- Department of Entomology, Purdue University, 901 W State Street, West Lafayette, IN, 47907, USA
| | - Keith Pardee
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, M5S 3M2, Canada.
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, M5S 1A1, Canada.
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5
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Goblirsch M, Adamczyk JJ. Using the Honey Bee (Apis mellifera L.) Cell Line AmE-711 to Evaluate Insecticide Toxicity. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:88-99. [PMID: 36263950 PMCID: PMC10107357 DOI: 10.1002/etc.5500] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 06/20/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
One of the main contributors to poor productivity and elevated mortality of honey bee colonies globally is insecticide exposure. Whole-organism and colony-level studies have demonstrated the effects of insecticides on many aspects of honey bee biology and have also shown their interactions with pathogens. However, there is a need for in vitro studies using cell lines to provide greater illumination of the effects of insecticides on honey bee cellular and molecular processes. We used a continuous cell line established from honey bee embryonic tissues (AmE-711) in assays that enabled assessment of cell viability in response to insecticide exposure. We exposed AmE-711 cells to four formulations, each containing a different insecticide. Treatment of cells with the insecticides resulted in a concentration-dependent reduction in viability after a 24-h exposure, whereas long-term exposure (120 h) to sublethal concentrations had limited effects on viability. The 24-h exposure data allowed us to predict the half-maximal lethal concentration (LC50) for each insecticide using a four-parameter logistical model. We then exposed cells for 12 h to the predicted LC50 and observed changes in morphology that would indicate stress and death. Reverse transcription-quantitative polymerase chain reaction analysis corroborated changes in morphology: expression of a cellular stress response gene, 410087a, increased after an 18-h exposure to the predicted LC50. Demonstration of the effects of insecticides through use of AmE-711 provides a foundation for additional research addressing issues specific to honey bee toxicology and complements whole-organism and colony-level approaches. Moreover, advances in the use of AmE-711 in high-throughput screening and in-depth analysis of cell regulatory networks will promote the discovery of novel control agents with decreased negative impacts on honey bees. Environ Toxicol Chem 2023;42:88-99. Published 2022. This article is a U.S. Government work and is in the public domain in the USA. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Affiliation(s)
- Michael Goblirsch
- Thad Cochran Southern Horticultural Laboratory, Agricultural Research ServiceUS Department of AgriculturePoplarvilleMississippiUSA
| | - John J. Adamczyk
- Thad Cochran Southern Horticultural Laboratory, Agricultural Research ServiceUS Department of AgriculturePoplarvilleMississippiUSA
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6
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Huang WF, Li R, Jin L, Huang S. Procedures and potential pitfalls for constructing a bee-infecting RNA virus clone. FRONTIERS IN INSECT SCIENCE 2022; 2:908702. [PMID: 38468785 PMCID: PMC10926416 DOI: 10.3389/finsc.2022.908702] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 08/29/2022] [Indexed: 03/13/2024]
Abstract
Viruses are factors that can fluctuate insect populations, including honey bees. Most honey bee infecting viruses are single positive-stranded RNA viruses that may not specifically infect honey bees and can be hazardous to other pollinator insects. In addition, these viruses could synergize with other stressors to worsen the honey bee population decline. To identify the underlying detailed mechanisms, reversed genetic studies with infectious cDNA clones of the viruses are necessary. Moreover, an infectious cDNA clone can be applied to studies as an ideal virus isolate that consists of a single virus species with a uniform genotype. However, only a few infectious cDNA clones have been reported in honey bee studies since the first infectious cDNA clone was published four decades ago. This article discusses steps, rationales, and potential issues in bee-infecting RNA virus cloning. In addition, failed experiences of cloning a Deformed wing virus isolate that was phylogenetically identical to Kakugo virus were addressed. We hope the information provided in this article can facilitate further developments of reverse-genetic studies of bee-infecting viruses to clarify the roles of virus diseases in the current pollinator declines.
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Affiliation(s)
- Wei-Fone Huang
- College of Animal Science (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou, China
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7
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Arya SK, Goodman CL, Stanley D, Palli SR. A database of crop pest cell lines. In Vitro Cell Dev Biol Anim 2022; 58:719-757. [PMID: 35994130 DOI: 10.1007/s11626-022-00710-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 07/13/2022] [Indexed: 11/27/2022]
Abstract
We have developed an online database describing the known cell lines from Coleoptera, Diptera, Hemiptera, Hymenoptera, and Lepidoptera that were developed from agricultural pests. Cell line information has been primarily obtained from previous compilations of insect cell lines. We conducted in-depth Internet literature searches and drew on Internet sources such as the Cellosaurus database (https://web.expasy.org/cellosaurus/), and inventories from cell line depositories. Here, we report on a new database of insect cell lines, which covers 719 cell lines from 86 species. We have not included cell lines developed from Drosophila because they are already known from published databases, such as https://dgrc.bio.indiana.edu/cells/Catalog. We provide the designation, tissue and species of origin, cell line developer, unique characteristics, its use in various applications, publications, and patents, and, when known, insect virus susceptibility. This information has been assembled and organized into a searchable database available at the link https://entomology.ca.uky.edu/aginsectcellsdatabase which will be updated on an ongoing basis.
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Affiliation(s)
- Surjeet Kumar Arya
- Department of Entomology, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY, 40546, USA
| | - Cynthia L Goodman
- Biological Control of Insects Research Laboratory, United States Department of Agriculture, Agricultural Research Service, Columbia, Missouri, 65203, USA
| | - David Stanley
- Biological Control of Insects Research Laboratory, United States Department of Agriculture, Agricultural Research Service, Columbia, Missouri, 65203, USA
| | - Subba Reddy Palli
- Department of Entomology, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY, 40546, USA.
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8
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Fallon AM. From Mosquito Ovaries to Ecdysone; from Ecdysone to Wolbachia: One Woman's Career in Insect Biology. INSECTS 2022; 13:756. [PMID: 36005381 PMCID: PMC9409236 DOI: 10.3390/insects13080756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Revised: 08/16/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
In anautogenous mosquitoes, synchronous development of terminal ovarian follicles after a blood meal provides an important model for studies on insect reproduction. Removal and implantation of ovaries, in vitro culture of dissected tissues and immunological assays for vitellogenin synthesis by the fat body showed that the Aedes aegypti (L.) (Diptera, Culicidae) mosquito ovary produces a factor essential for egg production. The discovery that the ovarian factor was the insect steroid hormone, ecdysone, provided a model for co-option of the larval hormones as reproductive hormones in adult insects. In later work on cultured mosquito cells, ecdysone was shown to arrest the cell cycle, resulting in an accumulation of diploid cells in G1, prior to initiation of DNA synthesis. Some mosquito species, such as Culex pipiens L. (Diptera, Culicidae), harbor the obligate intracellular bacterium, Wolbachia pipientis Hertig (Rickettsiales, Anaplasmataceae), in their reproductive tissues. When maintained in mosquito cell lines, Wolbachia abundance increases in ecdysone-arrested cells. This observation facilitated the recovery of high levels of Wolbachia from cultured cells for microinjection and genetic manipulation. In female Culex pipiens, it will be of interest to explore how hormonal cues that support initiation and progression of the vitellogenic cycle influence Wolbachia replication and transmission to subsequent generations via infected eggs.
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Affiliation(s)
- Ann M Fallon
- Department of Entomology, University of Minnesota, 1980 Folwell Ave., St Paul, MN 55108, USA
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9
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Martinez-Mercado MA, de Jesús JLD, Galindo-Sánchez CE, Saavedra-Flores A, Carrillo-Tripp J. Novel viral RNA genomes of the vine mealybug Planococcus ficus. J Gen Virol 2022; 103. [PMID: 35259086 DOI: 10.1099/jgv.0.001717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The vine mealybug, Planococcus ficus (Signoret, 1875), is the most important insect pest in growing areas of the grapevine Vitis vinifera L. in several countries, including Mexico. In Mexico, Baja California (B.C.) is the region with the highest production of V. vinifera L. grapes for industrial purposes. Recently, the diversity of viruses infecting insects only (insect-specific viruses) has been broadly explored to elucidate further ecological viral-host interactions in many insect species, which in some cases has resulted in the application of virus-based biological control agents for insect pests. However, a survey of the Pl. ficus virome has not been done yet. In the present study, we pooled Pl. ficus individuals collected through different vineyards of Ensenada, B.C., Mexico and analysed them by meta-transcriptomics. Novel nearly complete genomes of five RNA viruses were retrieved. These viruses were related to the Iflaviridae and Reoviridae families, and to the Picornavirales and Tolivirales orders. A new isolate belonging to the Dicistroviridae family was also found. Phylogenetic analyses showed that these putative viral genomes group with viruses having hemipteran (including a mealybug species) or other insect hosts, or with viruses associated with insects. Our results suggest that the identified novel RNA viruses could be insect-specific viruses of Pl. ficus. This work is the first insight into the Pl. ficus virome; it guarantees further studies aimed to characterize those viruses with potential for application in biological control of this economically important insect.
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Affiliation(s)
- Miguel A Martinez-Mercado
- Departamento de Biotecnología Marina, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California (CICESE), Baja California 22860, Mexico
| | - José Luis Duarte de Jesús
- Departamento de Microbiología, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California (CICESE), Baja California 22860, Mexico
| | - Clara E Galindo-Sánchez
- Departamento de Biotecnología Marina, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California (CICESE), Baja California 22860, Mexico
| | - Anaid Saavedra-Flores
- Departamento de Biotecnología Marina, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California (CICESE), Baja California 22860, Mexico
| | - Jimena Carrillo-Tripp
- Departamento de Microbiología, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California (CICESE), Baja California 22860, Mexico
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10
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Piot N, Smagghe G. Critical View on the Importance of Host Defense Strategies on Virus Distribution of Bee Viruses: What Can We Learn from SARS-CoV-2 Variants? Viruses 2022; 14:503. [PMID: 35336909 PMCID: PMC8951442 DOI: 10.3390/v14030503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/22/2022] [Accepted: 02/26/2022] [Indexed: 02/05/2023] Open
Abstract
Bees, both wild and domesticated ones, are hosts to a plethora of viruses, with most of them infecting a wide range of bee species and genera. Although viral discovery and research on bee viruses date back over 50 years, the last decade is marked by a surge of new studies, new virus discoveries, and reports on viral transmission in and between bee species. This steep increase in research on bee viruses was mainly initiated by the global reports on honeybee colony losses and the worldwide wild bee decline, where viruses are regarded as one of the main drivers. While the knowledge gained on bee viruses has significantly progressed in a short amount of time, we believe that integration of host defense strategies and their effect on viral dynamics in the multi-host viral landscape are important aspects that are currently still missing. With the large epidemiological dataset generated over the last two years on the SARS-CoV-2 pandemic, the role of these defense mechanisms in shaping viral dynamics has become eminent. Integration of these dynamics in a multi-host system would not only greatly aid the understanding of viral dynamics as a driver of wild bee decline, but we believe bee pollinators and their viruses provide an ideal system to study the multi-host viruses and their epidemiology.
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Affiliation(s)
- Niels Piot
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Guy Smagghe
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
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11
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Ray AM, Davis SL, Rasgon JL, Grozinger CM. Simulated vector transmission differentially influences dynamics of two viral variants of deformed wing virus in honey bees ( Apis mellifera). J Gen Virol 2021; 102. [PMID: 34816791 PMCID: PMC8742989 DOI: 10.1099/jgv.0.001687] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Understanding how vectors alter the interactions between viruses and their hosts is a fundamental question in virology and disease ecology. In honey bees, transmission of deformed wing virus (DWV) by parasitic Varroa mites has been associated with elevated disease and host mortality, and Varroa transmission has been hypothesized to lead to increased viral titres or select for more virulent variants. Here, we mimicked Varroa transmission by serially passaging a mixed population of two DWV variants, A and B, by injection through in vitro reared honey bee pupae and tracking these viral populations through five passages. The DWV-A and DWV-B variant proportions shifted dynamically through passaging, with DWV-B outcompeting DWV-A after one passage, but levels of both variants becoming equivalent by Passage 5. Sequencing analysis revealed a dominant, recombinant DWV-B strain (DWV-A derived 5′ IRES region with the rest of the genome DWV-B), with low nucleotide diversity that decreased through passaging. DWV-A populations had higher nucleotide diversity compared to DWV-B, but this also decreased through passaging. Selection signatures were found across functional regions of the DWV-A and DWV-B genomes, including amino acid mutations in the putative capsid protein region. Simulated vector transmission differentially impacted two closely related viral variants which could influence viral interactions with the host, demonstrating surprising plasticity in vector-host-viral dynamics.
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Affiliation(s)
- Allyson M Ray
- Molecular, Cellular, and Integrative Biosciences Graduate Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA.,Department of Entomology, Center for Infectious Disease Dynamics, Center for Pollinator Research, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Sheldon L Davis
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
| | - Jason L Rasgon
- Molecular, Cellular, and Integrative Biosciences Graduate Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA.,Department of Entomology, Center for Infectious Disease Dynamics, Center for Pollinator Research, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Christina M Grozinger
- Molecular, Cellular, and Integrative Biosciences Graduate Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA.,Department of Entomology, Center for Infectious Disease Dynamics, Center for Pollinator Research, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA
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12
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Watanabe K, Yoshiyama M, Akiduki G, Yokoi K, Hoshida H, Kayukawa T, Kimura K, Hatakeyama M. A simple method for ex vivo honey bee cell culture capable of in vitro gene expression analysis. PLoS One 2021; 16:e0257770. [PMID: 34555120 PMCID: PMC8460014 DOI: 10.1371/journal.pone.0257770] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 09/09/2021] [Indexed: 01/29/2023] Open
Abstract
Cultured cells are a very powerful tool for investigating biological events in vitro; therefore, cell lines have been established not only in model insect species, but also in non-model species. However, there are few reports on the establishment of stable cell lines and development of systems to introduce genes into the cultured cells of the honey bee (Apis mellifera). We describe a simple ex vivo cell culture system for the honey bee. Hemocyte cells obtained from third and fourth instar larvae were cultured in commercial Grace’s insect medium or MGM-450 insect medium for more than two weeks maintaining a normal morphology without deterioration. After an expression plasmid vector bearing the enhanced green fluorescent protein (egfp) gene driven by the immediate early 2 (IE2) viral promoter was transfected into cells, EGFP fluorescence was detected in cells for more than one week from one day after transfection. Furthermore, double-stranded RNA corresponding to a part of the egfp gene was successfully introduced into cells and interfered with egfp gene expression. A convenient and reproducible method for an ex vivo cell culture that is fully practicable for gene expression assays was established for the honey bee.
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Affiliation(s)
- Kazuyo Watanabe
- Insect Gene Function Research Unit, Division of Insect Sciences, Institute of Agrobiological Sciences, NARO, Owashi, Tsukuba, Japan
| | - Mikio Yoshiyama
- Animal Genetics Unit, Division of Animal Breeding and Reproduction Research, Institute of Livestock and Grassland Science, NARO, Ikenodai, Tsukuba, Japan
| | - Gaku Akiduki
- Insect Pest Management Group, Division of Agro-Environment Research, Kyushu Okinawa Agricultural Research Center, NARO, Koshi, Kumamoto, Japan
| | - Kakeru Yokoi
- Insect Genome Research and Engineering Unit, Division of Applied Genetics, Institute of Agrobiological Sciences, NARO, Owashi, Tsukuba, Japan
| | - Hiroko Hoshida
- Insect Genome Research and Engineering Unit, Division of Applied Genetics, Institute of Agrobiological Sciences, NARO, Owashi, Tsukuba, Japan
| | - Takumi Kayukawa
- Insect Gene Function Research Unit, Division of Insect Sciences, Institute of Agrobiological Sciences, NARO, Owashi, Tsukuba, Japan
| | - Kiyoshi Kimura
- Animal Genetics Unit, Division of Animal Breeding and Reproduction Research, Institute of Livestock and Grassland Science, NARO, Ikenodai, Tsukuba, Japan
| | - Masatsugu Hatakeyama
- Insect Genome Research and Engineering Unit, Division of Applied Genetics, Institute of Agrobiological Sciences, NARO, Owashi, Tsukuba, Japan
- * E-mail:
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Cell Line Platforms Support Research into Arthropod Immunity. INSECTS 2021; 12:insects12080738. [PMID: 34442304 PMCID: PMC8397109 DOI: 10.3390/insects12080738] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/10/2021] [Accepted: 08/12/2021] [Indexed: 12/21/2022]
Abstract
Simple Summary Many insect and tick species are serious pests, because insects damage crop plants and, along with ticks, transmit a wide range of human and animal diseases. One way of controlling these pests is by impairing their immune system, which protects them from bacterial, fungal, and viral infections. An important tool for studying immunity is using long-lasting cell cultures, known as cell lines. These lines can be frozen and thawed at will to be used in automated tests, and they provide consistent results over years. Questions that can be asked using cell lines include: How do insects or ticks recognize when they have been infected and by what organism? What kinds of defensive strategies do they use to contain or kill infectious agents? This article reviews research with insect or tick cell lines to answer these questions, as well as other questions relating to immunity. This review also discusses future research strategies for working with cell lines. Abstract Innate immune responses are essential to maintaining insect and tick health and are the primary defense against pathogenic viruses, bacteria, and fungi. Cell line research is a powerful method for understanding how invertebrates mount defenses against pathogenic organisms and testing hypotheses on how these responses occur. In particular, immortal arthropod cell lines are valuable tools, providing a tractable, high-throughput, cost-effective, and consistent platform to investigate the mechanisms underpinning insect and tick immune responses. The research results inform the controls of medically and agriculturally important insects and ticks. This review presents several examples of how cell lines have facilitated research into multiple aspects of the invertebrate immune response to pathogens and other foreign agents, as well as comments on possible future research directions in these robust systems.
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McMenamin AJ, Parekh F, Lawrence V, Flenniken ML. Investigating Virus-Host Interactions in Cultured Primary Honey Bee Cells. INSECTS 2021; 12:653. [PMID: 34357313 PMCID: PMC8329929 DOI: 10.3390/insects12070653] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/10/2021] [Accepted: 07/13/2021] [Indexed: 12/23/2022]
Abstract
Honey bee (Apis mellifera) health is impacted by viral infections at the colony, individual bee, and cellular levels. To investigate honey bee antiviral defense mechanisms at the cellular level we further developed the use of cultured primary cells, derived from either larvae or pupae, and demonstrated that these cells could be infected with a panel of viruses, including common honey bee infecting viruses (i.e., sacbrood virus (SBV) and deformed wing virus (DWV)) and an insect model virus, Flock House virus (FHV). Virus abundances were quantified over the course of infection. The production of infectious virions in cultured honey bee pupal cells was demonstrated by determining that naïve cells became infected after the transfer of deformed wing virus or Flock House virus from infected cell cultures. Initial characterization of the honey bee antiviral immune responses at the cellular level indicated that there were virus-specific responses, which included increased expression of bee antiviral protein-1 (GenBank: MF116383) in SBV-infected pupal cells and increased expression of argonaute-2 and dicer-like in FHV-infected hemocytes and pupal cells. Additional studies are required to further elucidate virus-specific honey bee antiviral defense mechanisms. The continued use of cultured primary honey bee cells for studies that involve multiple viruses will address this knowledge gap.
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Affiliation(s)
- Alexander J. McMenamin
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA; (A.J.M.); (F.P.); (V.L.)
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, MT 59717, USA
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA
| | - Fenali Parekh
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA; (A.J.M.); (F.P.); (V.L.)
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, MT 59717, USA
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA
| | - Verena Lawrence
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA; (A.J.M.); (F.P.); (V.L.)
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA
| | - Michelle L. Flenniken
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA; (A.J.M.); (F.P.); (V.L.)
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, MT 59717, USA
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA
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15
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Daughenbaugh KF, Kahnonitch I, Carey CC, McMenamin AJ, Wiegand T, Erez T, Arkin N, Ross B, Wiedenheft B, Sadeh A, Chejanovsky N, Mandelik Y, Flenniken ML. Metatranscriptome Analysis of Sympatric Bee Species Identifies Bee Virus Variants and a New Virus, Andrena-Associated Bee Virus-1. Viruses 2021; 13:291. [PMID: 33673324 PMCID: PMC7917660 DOI: 10.3390/v13020291] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/22/2021] [Accepted: 02/03/2021] [Indexed: 12/11/2022] Open
Abstract
Bees are important plant pollinators in agricultural and natural ecosystems. High average annual losses of honey bee (Apis mellifera) colonies in some parts of the world, and regional population declines of some mining bee species (Andrena spp.), are attributed to multiple factors including habitat loss, lack of quality forage, insecticide exposure, and pathogens, including viruses. While research has primarily focused on viruses in honey bees, many of these viruses have a broad host range. It is therefore important to apply a community level approach in studying the epidemiology of bee viruses. We utilized high-throughput sequencing to evaluate viral diversity and viral sharing in sympatric, co-foraging bees in the context of habitat type. Variants of four common viruses (i.e., black queen cell virus, deformed wing virus, Lake Sinai virus 2, and Lake Sinai virus NE) were identified in honey bee and mining bee samples, and the high degree of nucleotide identity in the virus consensus sequences obtained from both taxa indicates virus sharing. We discovered a unique bipartite + ssRNA Tombo-like virus, Andrena-associated bee virus-1 (AnBV-1). AnBV-1 infects mining bees, honey bees, and primary honey bee pupal cells maintained in culture. AnBV-1 prevalence and abundance was greater in mining bees than in honey bees. Statistical modeling that examined the roles of ecological factors, including floral diversity and abundance, indicated that AnBV-1 infection prevalence in honey bees was greater in habitats with low floral diversity and abundance, and that interspecific virus transmission is strongly modulated by the floral community in the habitat. These results suggest that land management strategies that aim to enhance floral diversity and abundance may reduce AnBV-1 spread between co-foraging bees.
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Affiliation(s)
- Katie F. Daughenbaugh
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA; (K.F.D.); (B.R.)
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA; (C.C.C.); (A.J.M.); (T.W.)
| | - Idan Kahnonitch
- The Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 5290002, Israel; (I.K.); (Y.M.)
- Agroecology Lab, Newe Ya’ar Research Center, ARO, Ramat Yishay 30095, Israel; (N.A.); (A.S.)
| | - Charles C. Carey
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA; (C.C.C.); (A.J.M.); (T.W.)
| | - Alexander J. McMenamin
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA; (C.C.C.); (A.J.M.); (T.W.)
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, USA;
| | - Tanner Wiegand
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA; (C.C.C.); (A.J.M.); (T.W.)
| | - Tal Erez
- Entomology Department, ARO, The Volcani Center, Rishon Lezion 7528809, Israel; (T.E.); (N.C.)
| | - Naama Arkin
- Agroecology Lab, Newe Ya’ar Research Center, ARO, Ramat Yishay 30095, Israel; (N.A.); (A.S.)
- The Mina & Everard Goodman Faculty of Life Sciences, Bar Ilan University, Ramat Gan 5290002, Israel
| | - Brian Ross
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA; (K.F.D.); (B.R.)
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA; (C.C.C.); (A.J.M.); (T.W.)
| | - Blake Wiedenheft
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, USA;
| | - Asaf Sadeh
- Agroecology Lab, Newe Ya’ar Research Center, ARO, Ramat Yishay 30095, Israel; (N.A.); (A.S.)
| | - Nor Chejanovsky
- Entomology Department, ARO, The Volcani Center, Rishon Lezion 7528809, Israel; (T.E.); (N.C.)
| | - Yael Mandelik
- The Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 5290002, Israel; (I.K.); (Y.M.)
| | - Michelle L. Flenniken
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA; (K.F.D.); (B.R.)
- Pollinator Health Center, Montana State University, Bozeman, MT 59717, USA; (C.C.C.); (A.J.M.); (T.W.)
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, USA;
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Wu Y, Yuan X, Li J, Kadowaki T. DWV Infection in vitro Using Honey Bee Pupal Tissue. Front Microbiol 2021; 12:631889. [PMID: 33643262 PMCID: PMC7902917 DOI: 10.3389/fmicb.2021.631889] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Accepted: 01/20/2021] [Indexed: 11/30/2022] Open
Abstract
The deformed wing virus (DWV) has been best characterized among honey bee viruses; however, very little is known regarding the mechanisms of viral infection and replication due to the lack of immortalized honey bee cell lines. To solve this problem, we established an in vitro system using honey bee pupal tissue to reconstruct DWV binding and entry into the host cell, followed by translation of the RNA genome and polyprotein processing using RNA-dependent RNA polymerase (RdRP) as a marker. Using this system, the P-domain of the virion subunit VP1 was found to be essential for DWV infection, but not for binding and entry into the cell. DWV efficiently infected the head tissue derived from early but not late pupa, suggesting that undifferentiated cells are targeted for viral infection. Furthermore, we found that inhibitors of mammalian picornavirus 3C-protease, rupintrivir and quercetin suppressed RdRP synthesis, indicating that this in vitro system is also useful for screening a compound to control viral infection. Our in vitro system may help to understand the mechanism of DWV infection in host cells.
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Affiliation(s)
| | | | | | - Tatsuhiko Kadowaki
- Department of Biological Sciences, Xi’an Jiaotong-Liverpool University, Suzhou Dushu Lake Higher Education Town, Suzhou, China
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Mak M, Beattie KD, Basta A, Randall D, Chen ZH, Spooner-Hart R. Triangulation of methods using insect cell lines to investigate insecticidal mode-of-action. PEST MANAGEMENT SCIENCE 2021; 77:492-501. [PMID: 32815275 DOI: 10.1002/ps.6046] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 07/29/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND This study investigated three in vitro models to assist in elucidating possible mode-of-action, which could be adopted to evaluate insecticidal activity of complex, unknown, or multi-constituent formulations. We used a combination of absorbance spectrometry, confocal scanning laser microscopy and microelectrode ion flux estimation (MIFE) to provide insight into potential target sites for insecticides. This study used two insect cell lines and evaluated three pyrethroid insecticides. RESULTS We observed that the two cell lines produced distinctly different responses. Drosophila melanogaster D.mel-S2 cell line was a useful model to monitor ion flux changes, resulting from insecticides with neural toxicity; however, it was less useful to determine some metabolic pathway indicators of toxic stress. Conversely, the Spodoptera frugiperda Sf9 cell line produced acute reactive oxygen species (ROS) in response to insecticide treatments, but was not highly responsive in electrophysiological experiments. We also showed that the natural, multi-constituent botanical extract of pyrethrum elicited different Na+ , Cl- and Ca2+ ion fluxes than its synthetic, single constituent analogues, α-cypermethrin and esfenvalerate. These two methods used in combination with absorbance spectrometry measuring cell growth inhibition plus cell mortality assays shed some light on cytotoxic responses in differing model cell lines. CONCLUSION This research highlights the importance of using multiple cell types and interdisciplinary methods to provide a better insight into mode of insecticidal action. This is especially pertinent to novel biopesticide discovery, as the underlying mechanisms for toxicity in initial screening processes are likely to be unknown.
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Affiliation(s)
- Michelle Mak
- School of Science, Western Sydney University, Penrith, Australia
| | - Karren D Beattie
- School of Science, Western Sydney University, Penrith, Australia
| | - Albert Basta
- School of Science, Western Sydney University, Penrith, Australia
| | - David Randall
- School of Science, Western Sydney University, Penrith, Australia
| | - Zhong-Hua Chen
- School of Science, Western Sydney University, Penrith, Australia
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, Australia
| | - Robert Spooner-Hart
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, Australia
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OneHealth implications of infectious diseases of wild and managed bees. J Invertebr Pathol 2020; 186:107506. [PMID: 33249062 DOI: 10.1016/j.jip.2020.107506] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 10/27/2020] [Accepted: 11/20/2020] [Indexed: 01/23/2023]
Abstract
The OneHealth approach aims to further our understanding of the drivers of human, animal and environmental health, and, ultimately, to improve them by combining approaches and knowledge from medicine, biology and fields beyond. Wild and managed bees are essential pollinators of crops and wild flowers. Their health thus directly impacts on human and environmental health. At the same time, these bee species represent highly amenable and relevant model organisms for a OneHealth approach that aims to study fundamental epidemiological questions. In this review, we focus on how infectious diseases of wild and managed bees can be used as a OneHealth model system, informing fundamental questions on ecological immunology and disease transmission, while addressing how this knowledge can be used to tackle the issues facing pollinator health.
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Advances in Honey Bee Virus Research. Viruses 2020; 12:v12101149. [PMID: 33050489 PMCID: PMC7600749 DOI: 10.3390/v12101149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 10/09/2020] [Indexed: 11/30/2022] Open
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Erez T, Chejanovsky N. Infection of a Lepidopteran Cell Line with Deformed Wing Virus. Viruses 2020; 12:E739. [PMID: 32659903 PMCID: PMC7412015 DOI: 10.3390/v12070739] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 07/02/2020] [Accepted: 07/07/2020] [Indexed: 12/19/2022] Open
Abstract
Many attempts to develop a reliable cell cultured-based system to study honey bee virus infections have encountered substantial difficulties. We investigated the ability of a cell line from a heterologous insect to sustain infection by a honey bee virus. For this purpose, we infected the Lepidopteran hemocytic cell line (P1) with Deformed wing virus (DWV). The genomic copies of DWV increased upon infection, as monitored by quantitative RT-PCR. Moreover, a tagged-primer-based RT-PCR analysis showed the presence of DWV negative-sense RNA in the cells, indicating virus replication. However, the DWV from infected cells was mildly infectious to P1 cells. Similar results were obtained when the virus was injected into Apis mellifera pupae. Thus, though the virus yields from the infected cells appeared to be very low, we show for the first time that DWV can replicate in a heterologous cell line. Given the availability of many other insect cell lines, our study paves the way for future exploration in this direction. In the absence of adequate A. mellifera cell lines, exploring the ability of alternative cell lines to enable honey bee virus infections could provide the means to study and understand the viral infectious cycle at the cellular level and facilitate obtaining purified isolates of these viruses.
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Affiliation(s)
| | - Nor Chejanovsky
- Department of Entomology Institute of Plant Protection, Agricultural Research Organization, Rishon Lezion 7528809, Israel;
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