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Gopalan SS, Perry BW, Francioli YZ, Schield DR, Guss HD, Bernstein JM, Ballard K, Smith CF, Saviola AJ, Adams RH, Mackessy SP, Castoe TA. Diverse Gene Regulatory Mechanisms Alter Rattlesnake Venom Gene Expression at Fine Evolutionary Scales. Genome Biol Evol 2024; 16:evae110. [PMID: 38753011 PMCID: PMC11243404 DOI: 10.1093/gbe/evae110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/08/2024] [Indexed: 07/13/2024] Open
Abstract
Understanding and predicting the relationships between genotype and phenotype is often challenging, largely due to the complex nature of eukaryotic gene regulation. A step towards this goal is to map how phenotypic diversity evolves through genomic changes that modify gene regulatory interactions. Using the Prairie Rattlesnake (Crotalus viridis) and related species, we integrate mRNA-seq, proteomic, ATAC-seq and whole-genome resequencing data to understand how specific evolutionary modifications to gene regulatory network components produce differences in venom gene expression. Through comparisons within and between species, we find a remarkably high degree of gene expression and regulatory network variation across even a shallow level of evolutionary divergence. We use these data to test hypotheses about the roles of specific trans-factors and cis-regulatory elements, how these roles may vary across venom genes and gene families, and how variation in regulatory systems drive diversity in venom phenotypes. Our results illustrate that differences in chromatin and genotype at regulatory elements play major roles in modulating expression. However, we also find that enhancer deletions, differences in transcription factor expression, and variation in activity of the insulator protein CTCF also likely impact venom phenotypes. Our findings provide insight into the diversity and gene-specificity of gene regulatory features and highlight the value of comparative studies to link gene regulatory network variation to phenotypic variation.
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Affiliation(s)
- Siddharth S Gopalan
- Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
| | - Blair W Perry
- Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
- School of Biological Sciences, Washington State University, Pullman, WA 99164, USA
| | - Yannick Z Francioli
- Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
| | - Drew R Schield
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Hannah D Guss
- Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
| | - Justin M Bernstein
- Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
| | - Kaas Ballard
- Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
| | - Cara F Smith
- Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Aurora, CO 80045, USA
| | - Anthony J Saviola
- Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Aurora, CO 80045, USA
| | - Richard H Adams
- Department of Entomology and Plant Pathology, University of Arkansas Agricultural Experimental Station, University of Arkansas, Fayetteville, AR 72701, USA
| | - Stephen P Mackessy
- Department of Biological Sciences, University of Northern Colorado, Greeley, CO 80639, USA
| | - Todd A Castoe
- Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
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2
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Modahl CM, Han SX, van Thiel J, Vaz C, Dunstan NL, Frietze S, Jackson TNW, Mackessy SP, Kini RM. Distinct regulatory networks control toxin gene expression in elapid and viperid snakes. BMC Genomics 2024; 25:186. [PMID: 38365592 PMCID: PMC10874052 DOI: 10.1186/s12864-024-10090-y] [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] [Received: 07/28/2023] [Accepted: 02/05/2024] [Indexed: 02/18/2024] Open
Abstract
BACKGROUND Venom systems are ideal models to study genetic regulatory mechanisms that underpin evolutionary novelty. Snake venom glands are thought to share a common origin, but there are major distinctions between venom toxins from the medically significant snake families Elapidae and Viperidae, and toxin gene regulatory investigations in elapid snakes have been limited. Here, we used high-throughput RNA-sequencing to profile gene expression and microRNAs between active (milked) and resting (unmilked) venom glands in an elapid (Eastern Brown Snake, Pseudonaja textilis), in addition to comparative genomics, to identify cis- and trans-acting regulation of venom production in an elapid in comparison to viperids (Crotalus viridis and C. tigris). RESULTS Although there is conservation in high-level mechanistic pathways regulating venom production (unfolded protein response, Notch signaling and cholesterol homeostasis), there are differences in the regulation of histone methylation enzymes, transcription factors, and microRNAs in venom glands from these two snake families. Histone methyltransferases and transcription factor (TF) specificity protein 1 (Sp1) were highly upregulated in the milked elapid venom gland in comparison to the viperids, whereas nuclear factor I (NFI) TFs were upregulated after viperid venom milking. Sp1 and NFI cis-regulatory elements were common to toxin gene promoter regions, but many unique elements were also present between elapid and viperid toxins. The presence of Sp1 binding sites across multiple elapid toxin gene promoter regions that have been experimentally determined to regulate expression, in addition to upregulation of Sp1 after venom milking, suggests this transcription factor is involved in elapid toxin expression. microRNA profiles were distinctive between milked and unmilked venom glands for both snake families, and microRNAs were predicted to target a diversity of toxin transcripts in the elapid P. textilis venom gland, but only snake venom metalloproteinase transcripts in the viperid C. viridis venom gland. These results suggest differences in toxin gene posttranscriptional regulation between the elapid P. textilis and viperid C. viridis. CONCLUSIONS Our comparative transcriptomic and genomic analyses between toxin genes and isoforms in elapid and viperid snakes suggests independent toxin regulation between these two snake families, demonstrating multiple different regulatory mechanisms underpin a venomous phenotype.
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Affiliation(s)
- Cassandra M Modahl
- Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore, Singapore.
- Centre for Snakebite Research and Interventions, Liverpool School of Tropical Medicine, Liverpool, U.K..
| | - Summer Xia Han
- Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore, Singapore
- Fulcrum Therapeutics, Cambridge, MA, U.S.A
| | - Jory van Thiel
- Centre for Snakebite Research and Interventions, Liverpool School of Tropical Medicine, Liverpool, U.K
- Institute of Biology Leiden, Leiden University, Leiden, The Netherlands
| | - Candida Vaz
- Human Development, Institute for Clinical Sciences (SICS), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | | | - Seth Frietze
- Department of Biomedical and Health Sciences, University of Vermont, Burlington, VT, U.S.A
| | - Timothy N W Jackson
- Australian Venom Research Unit, Department of Biochemistry and Pharmacology, University of Melbourne, Melbourne, Australia
| | - Stephen P Mackessy
- Department of Biological Sciences, University of Northern Colorado, Greeley, CO, U.S.A
| | - R Manjunatha Kini
- Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore, Singapore.
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- Singapore Eye Research Institute, Singapore, Singapore.
- Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, VA, U.S.A..
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3
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Camacho MF, Stuginski DR, Andrade-Silva D, Nishiyama-Jr MY, Valente RH, Zelanis A. A snapshot of Bothrops jararaca snake venom gland subcellular proteome. Biochimie 2023; 214:1-10. [PMID: 37315762 DOI: 10.1016/j.biochi.2023.06.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 05/01/2023] [Accepted: 06/11/2023] [Indexed: 06/16/2023]
Abstract
Snake venom protein synthesis undergoes finely regulated processes in the specialized secretory epithelium within the venom gland. Such processes occur within a defined period in the cell and at specific cellular locations. Thus, the determination of subcellular proteomes allows the characterization of protein groups for which the site may be relevant to their biological roles, thereby allowing the deconvolution of complex biological circuits into functional information. In this regard, we performed subcellular fractionation of proteins from B. jararaca venom gland, focusing on nuclear proteins since this cellular compartment comprises key effectors that shape gene expression. Our results provided a snapshot of B. jararaca's subcellular venom gland proteome and pointed to a 'conserved' proteome core among different life stages (newborn and adult) and between sexes (adult male and female). Overall, the top 15 highly abundant proteins identified in B. jararaca venom glands mirrored the panel of highly expressed genes in human salivary glands. Therefore, the expression profile observed for such a protein set could be considered a conserved core signature of salivary gland secretory epithelium. Moreover, the newborn venom gland displayed a unique expression signature of transcription factors involved in regulating transcription and biosynthetic processes and may mirror biological constraints of the ontogenetic development of B. jararaca, contributing to venom proteome diversity.
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Affiliation(s)
- Maurício Frota Camacho
- Functional Proteomics Laboratory, Institute of Science and Technology, Federal University of São Paulo, UNIFESP, São José dos Campos, SP, 12231-280, Brazil
| | - Daniel R Stuginski
- Laboratory of Herpetology, Butantan Institute, São Paulo, SP, 05503-900, Brazil
| | - Débora Andrade-Silva
- Telomeres Laboratory, Chemical and Biological Sciences Department, IBB-UNESP, Botucatu, São Paulo, Brazil
| | - Milton Y Nishiyama-Jr
- Laboratory of Applied Toxinology, Butantan Institute, Sao Paulo, SP, 05503-900, Brazil
| | - Richard H Valente
- Laboratory of Toxinology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, FIOCRUZ, Rio de Janeiro, RJ, 21040-900, Brazil
| | - André Zelanis
- Functional Proteomics Laboratory, Institute of Science and Technology, Federal University of São Paulo, UNIFESP, São José dos Campos, SP, 12231-280, Brazil.
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4
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Perry BW, Gopalan SS, Pasquesi GIM, Schield DR, Westfall AK, Smith CF, Koludarov I, Chippindale PT, Pellegrino MW, Chuong EB, Mackessy SP, Castoe TA. Snake venom gene expression is coordinated by novel regulatory architecture and the integration of multiple co-opted vertebrate pathways. Genome Res 2022; 32:1058-1073. [PMID: 35649579 PMCID: PMC9248877 DOI: 10.1101/gr.276251.121] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 04/11/2022] [Indexed: 11/25/2022]
Abstract
Understanding how regulatory mechanisms evolve is critical for understanding the processes that give rise to novel phenotypes. Snake venom systems represent a valuable and tractable model for testing hypotheses related to the evolution of novel regulatory networks, yet the regulatory mechanisms underlying venom production remain poorly understood. Here, we use functional genomics approaches to investigate venom regulatory architecture in the prairie rattlesnake and identify cis-regulatory sequences (enhancers and promoters), trans-regulatory transcription factors, and integrated signaling cascades involved in the regulation of snake venom genes. We find evidence that two conserved vertebrate pathways, the extracellular signal-regulated kinase and unfolded protein response pathways, were co-opted to regulate snake venom. In one large venom gene family (snake venom serine proteases), this co-option was likely facilitated by the activity of transposable elements. Patterns of snake venom gene enhancer conservation, in some cases spanning 50 million yr of lineage divergence, highlight early origins and subsequent lineage-specific adaptations that have accompanied the evolution of venom regulatory architecture. We also identify features of chromatin structure involved in venom regulation, including topologically associated domains and CTCF loops that underscore the potential importance of novel chromatin structure to coevolve when duplicated genes evolve new regulatory control. Our findings provide a model for understanding how novel regulatory systems may evolve through a combination of genomic processes, including tandem duplication of genes and regulatory sequences, cis-regulatory sequence seeding by transposable elements, and diverse transcriptional regulatory proteins controlled by a co-opted regulatory cascade.
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Affiliation(s)
- Blair W Perry
- Department of Biology, University of Texas at Arlington, Arlington, Texas 76019, USA
- School of Biological Sciences, Washington State University, Pullman, Washington 99164, USA
| | - Siddharth S Gopalan
- Department of Biology, University of Texas at Arlington, Arlington, Texas 76019, USA
| | - Giulia I M Pasquesi
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309, USA
| | - Drew R Schield
- Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado 80309, USA
| | - Aundrea K Westfall
- Department of Biology, University of Texas at Arlington, Arlington, Texas 76019, USA
| | - Cara F Smith
- School of Biological Sciences, University of Northern Colorado, Greeley, Colorado 80639, USA
| | - Ivan Koludarov
- Animal Venomics Group, Justus Liebig University, Giessen, 35390, Germany
| | - Paul T Chippindale
- Department of Biology, University of Texas at Arlington, Arlington, Texas 76019, USA
| | - Mark W Pellegrino
- Department of Biology, University of Texas at Arlington, Arlington, Texas 76019, USA
| | - Edward B Chuong
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309, USA
| | - Stephen P Mackessy
- School of Biological Sciences, University of Northern Colorado, Greeley, Colorado 80639, USA
| | - Todd A Castoe
- Department of Biology, University of Texas at Arlington, Arlington, Texas 76019, USA
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5
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Abstract
The venom glands of reptiles, particularly those of front-fanged advanced snakes, must satisfy conflicting biological demands: rapid synthesis of potentially labile and highly toxic proteins, storage in the gland lumen for long periods, stabilization of the stored secretions, immediate activation of toxins upon deployment and protection of the animal from the toxic effects of its own venom. This dynamic system could serve as a model for the study of a variety of different phenomena involving exocrine gland activation, protein synthesis, stabilization of protein products and secretory mechanisms. However, these studies have been hampered by a lack of a long-term model that can be propagated in the lab (as opposed to whole-animal studies). Numerous attempts have been made to extend the lifetime of venom gland secretory cells, but only recently has an organoid model been shown to have the requisite qualities of recapitulation of the native system, self-propagation and long-term viability (>1 year). A tractable model is now available for myriad cell- and molecular-level studies of venom glands, protein synthesis and secretion. However, venom glands of reptiles are not identical, and many differ very extensively in overall architecture, microanatomy and protein products produced. This Review summarizes the similarities among and differences between venom glands of helodermatid lizards and of rear-fanged and front-fanged snakes, highlighting those areas that are well understood and identifying areas where future studies can fill in significant gaps in knowledge of these ancient, yet fascinating systems.
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Affiliation(s)
- Stephen P Mackessy
- School of Biological Sciences, University of Northern Colorado, 501 20th St., CB 92, Greeley, CO 80639-0017, USA
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6
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Contrasting patterns of venom regeneration in a centipede (Scolopendra viridis) and a scorpion (Centruroides hentzi). Toxicon 2022; 210:132-140. [PMID: 35245607 DOI: 10.1016/j.toxicon.2022.02.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 02/22/2022] [Accepted: 02/28/2022] [Indexed: 11/23/2022]
Abstract
As biochemical traits with clear fitness consequences, venoms serve a critical ecological role for the animals that produce them. Understanding how venoms are maintained and regenerated after use will, therefore, provide valuable insight into the ecology of venomous animals. Furthermore, most studies on venomous organisms often require removing animals from the wild and waiting extended periods of time between venom extractions. Uncovering the patterns of venom regeneration across different species will likely lead to the development of more efficient venom extraction protocols, reducing both experimental time and the number of animals required. Using reversed-phase high-performance liquid chromatography, we identified asynchronous regeneration of venom protein component abundances in the centipede Scolopendra viridis but found no evidence for asynchronous venom regeneration in the scorpion Centruroides hentzi. We also observed high levels of intraspecific venom variation in C. hentzi, emphasizing the importance of testing for intraspecific venom variation in studies evaluating the synchronicity of venom regeneration. Although the regeneration of relative venom protein component abundances is an asynchronous process in S. viridis, we provide evidence that the presence-absence of major venom components is not an asynchronous process and suggest that studies relying on just the presence/absence of individual proteins (e.g. bioprospecting, drug discovery) could use catch-and-release methods of venom extraction to reduce the number of animals removed from the wild.
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7
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Claunch NM, Holding M, Frazier JT, Huff EM, Schonour RB, Vernasco B, Moore IT, Rokyta DR, Taylor EN. Experimental Manipulation of Corticosterone Does Not Affect Venom Composition or Functional Activity in Free-Ranging Rattlesnakes. Physiol Biochem Zool 2021; 94:286-301. [PMID: 34166170 DOI: 10.1086/714936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractVenom is an integral feeding trait in many animal species. Although venom often varies ontogenetically, little is known about the proximate physiological mediators of venom variation within individuals. The glucocorticoid hormone corticosterone (CORT) can alter the transcription and activation of proteins, including homologues of snake venom components such as snake venom metalloproteinases (SVMPs) and phospholipase A2 (PLA2). CORT is endogenously produced by snakes, varies seasonally and also in response to stress, and is a candidate endogenous mediator of changes in venom composition and functional activity. Here, we tested the hypothesis that CORT induces changes in snake venom by sampling the venom of wild adult rattlesnakes before and after they were treated with either empty (control) or CORT-filled (treatment) Silastic implants. We measured longitudinal changes in whole-venom composition, whole-venom total protein content, and enzymatic activity of SVMP and PLA2 components of venom. We also assessed the within-individual repeatability of venom components. Despite successfully elevating plasma CORT in the treatment group, we found no effect of CORT treatment or average plasma CORT level on any venom variables measured. Except for total protein content, venom components were highly repeatable within individuals ([Formula: see text]). Our results indicate that the effects of CORT, a hormone commonly associated with stress and metabolic functions, in adult rattlesnake venom are negligible. Our findings bode well for venom researchers and biomedical applications that rely on the consistency of venoms produced from potentially stressed individuals and provide an experimental framework for future studies of proximate mediators of venom variation across an individual's life span.
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8
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Kini RM. Toxinology provides multidirectional and multidimensional opportunities: A personal perspective. Toxicon X 2020; 6:100039. [PMID: 32550594 PMCID: PMC7285919 DOI: 10.1016/j.toxcx.2020.100039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 04/28/2020] [Accepted: 05/05/2020] [Indexed: 01/16/2023] Open
Abstract
In nature, toxins have evolved as weapons to capture and subdue the prey or to counter predators or competitors. When they are inadvertently injected into humans, they cause symptoms ranging from mild discomfort to debilitation and death. Toxinology is the science of studying venoms and toxins that are produced by a wide variety of organisms. In the past, the structure, function and mechanisms of most abundant and/or most toxic components were characterized to understand and to develop strategies to neutralize their toxicity. With recent technical advances, we are able to evaluate and determine the toxin profiles using transcriptomes of venom glands and proteomes of tiny amounts of venom. Enormous amounts of data from these studies have opened tremendous opportunities in many directions of basic and applied research. The lower costs for profiling venoms will further fuel the expansion of toxin database, which in turn will provide greater exciting and bright opportunities in toxin research.
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Affiliation(s)
- R. Manjunatha Kini
- Protein Science Laboratory, Department of Biological Sciences, Faculty of Science and Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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9
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Zancolli G, Casewell NR. Venom Systems as Models for Studying the Origin and Regulation of Evolutionary Novelties. Mol Biol Evol 2020; 37:2777-2790. [DOI: 10.1093/molbev/msaa133] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Abstract
A central goal in biology is to determine the ways in which evolution repeats itself. One of the most remarkable examples in nature of convergent evolutionary novelty is animal venom. Across diverse animal phyla, various specialized organs and anatomical structures have evolved from disparate developmental tissues to perform the same function, that is, produce and deliver a cocktail of potent molecules to subdue prey or predators. Venomous organisms therefore offer unique opportunities to investigate the evolutionary processes of convergence of key adaptive traits, and the molecular mechanisms underlying the emergence of novel genes, cells, and tissues. Indeed, some venomous species have already proven to be highly amenable as models for developmental studies, and recent work with venom gland organoids provides manipulatable systems for directly testing important evolutionary questions. Here, we provide a synthesis of the current knowledge that could serve as a starting point for the establishment of venom systems as new models for evolutionary and molecular biology. In particular, we highlight the potential of various venomous species for the study of cell differentiation and cell identity, and the regulatory dynamics of rapidly evolving, highly expressed, tissue-specific, gene paralogs. We hope that this review will encourage researchers to look beyond traditional study organisms and consider venom systems as useful tools to explore evolutionary novelties.
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Affiliation(s)
- Giulia Zancolli
- Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland
- Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Nicholas R Casewell
- Centre for Snakebite Research & Interventions, Liverpool School of Tropical Medicine, Liverpool, United Kingdom
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10
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Valente RH, Luna MS, de Oliveira UC, Nishiyama-Junior MY, Junqueira-de-Azevedo IDL, Portes-Junior JA, Clissa PB, Viana LG, Sanches L, Moura-da-Silva AM, Perales J, Yamanouye N. Bothrops jararaca accessory venom gland is an ancillary source of toxins to the snake. J Proteomics 2018; 177:137-147. [DOI: 10.1016/j.jprot.2017.12.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 11/27/2017] [Accepted: 12/17/2017] [Indexed: 12/17/2022]
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11
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Valente RH, Sakai F, Portes-Junior JA, Viana LG, Carneiro SM, Perales J, Yamanouye N. The Primary Duct of Bothrops jararaca Glandular Apparatus Secretes Toxins. Toxins (Basel) 2018; 10:E121. [PMID: 29533989 PMCID: PMC5869409 DOI: 10.3390/toxins10030121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 03/08/2018] [Accepted: 03/10/2018] [Indexed: 11/24/2022] Open
Abstract
Despite numerous studies concerning morphology and venom production and secretion in the main venom gland (and some data on the accessory gland) of the venom glandular apparatus of Viperidae snakes, the primary duct has been overlooked. We characterized the primary duct of the Bothrops jararaca snake by morphological analysis, immunohistochemistry and proteomics. The duct has a pseudostratified epithelium with secretory columnar cells with vesicles of various electrondensities, as well as mitochondria-rich, dark, basal, and horizontal cells. Morphological analysis, at different periods after venom extraction, showed that the primary duct has a long cycle of synthesis and secretion, as do the main venom and accessory glands; however, the duct has a mixed mode venom storage, both in the lumen and in secretory vesicles. Mouse anti-B. jararaca venom serum strongly stained the primary duct's epithelium. Subsequent proteomic analysis revealed the synthesis of venom toxins-mainly C-type lectin/C-type lectin-like proteins. We propose that the primary duct's toxin synthesis products complement the final venom bolus. Finally, we hypothesize that the primary duct and the accessory gland (components of the venom glandular apparatus) are part of the evolutionary path from a salivary gland towards the main venom gland.
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Affiliation(s)
- Richard Hemmi Valente
- Laboratório de Toxinologia, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro RJ 21040-900, Brazil.
- Instituto Nacional de Ciência e Tecnologia em Toxinas (INCTTox), CNPq, Brasília DF 71605-170, Brazil.
| | - Fernanda Sakai
- Laboratório de Farmacologia, Instituto Butantan, São Paulo SP 05503-900, Brazil.
| | | | - Luciana Godoy Viana
- Laboratório de Farmacologia, Instituto Butantan, São Paulo SP 05503-900, Brazil.
| | | | - Jonas Perales
- Laboratório de Toxinologia, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro RJ 21040-900, Brazil.
- Instituto Nacional de Ciência e Tecnologia em Toxinas (INCTTox), CNPq, Brasília DF 71605-170, Brazil.
| | - Norma Yamanouye
- Laboratório de Farmacologia, Instituto Butantan, São Paulo SP 05503-900, Brazil.
- Instituto Nacional de Ciência e Tecnologia em Toxinas (INCTTox), CNPq, Brasília DF 71605-170, Brazil.
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12
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Viana LG, Valente RH, Heluany CS, Souza-Imberg A, Luna MS, Perales J, Yamanouye N. Bothrops jararaca venom gland secretory cells in culture: Effects of noradrenaline on toxin production and secretion. Toxicon 2017; 133:1-9. [DOI: 10.1016/j.toxicon.2017.04.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 04/10/2017] [Accepted: 04/12/2017] [Indexed: 10/19/2022]
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13
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Augusto-de-Oliveira C, Stuginski DR, Kitano ES, Andrade-Silva D, Liberato T, Fukushima I, Serrano SMT, Zelanis A. Dynamic Rearrangement in Snake Venom Gland Proteome: Insights into Bothrops jararaca Intraspecific Venom Variation. J Proteome Res 2016; 15:3752-3762. [DOI: 10.1021/acs.jproteome.6b00561] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- César Augusto-de-Oliveira
- Laboratório
de Proteômica Funcional, Departamento de Ciência e Tecnologia, Universidade Federal de São Paulo (ICT-UNIFESP), São José dos Campos, São Paulo 12231-280, Brazil
| | - Daniel R. Stuginski
- Laboratório
de Herpetologia, Instituto Butantan, São Paulo, São
Paulo 05503-900, Brazil
| | - Eduardo S. Kitano
- Laboratório
Especial de Toxinologia Aplicada, Center of Toxins, Immune-Response
and Cell Signaling (CeTICS), Instituto Butantan, São Paulo, São
Paulo, Brazil
| | - Débora Andrade-Silva
- Laboratório
Especial de Toxinologia Aplicada, Center of Toxins, Immune-Response
and Cell Signaling (CeTICS), Instituto Butantan, São Paulo, São
Paulo, Brazil
| | - Tarcísio Liberato
- Laboratório
de Proteômica Funcional, Departamento de Ciência e Tecnologia, Universidade Federal de São Paulo (ICT-UNIFESP), São José dos Campos, São Paulo 12231-280, Brazil
| | - Isabella Fukushima
- Laboratório
de Proteômica Funcional, Departamento de Ciência e Tecnologia, Universidade Federal de São Paulo (ICT-UNIFESP), São José dos Campos, São Paulo 12231-280, Brazil
| | - Solange M. T. Serrano
- Laboratório
Especial de Toxinologia Aplicada, Center of Toxins, Immune-Response
and Cell Signaling (CeTICS), Instituto Butantan, São Paulo, São
Paulo, Brazil
| | - André Zelanis
- Laboratório
de Proteômica Funcional, Departamento de Ciência e Tecnologia, Universidade Federal de São Paulo (ICT-UNIFESP), São José dos Campos, São Paulo 12231-280, Brazil
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14
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Cooper AM, Kelln WJ, Hayes WK. Venom regeneration in the centipede Scolopendra polymorpha: evidence for asynchronous venom component synthesis. ZOOLOGY 2015; 117:398-414. [PMID: 25456977 DOI: 10.1016/j.zool.2014.06.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 05/21/2014] [Accepted: 06/27/2014] [Indexed: 01/15/2023]
Abstract
Venom regeneration comprises a vital process in animals that rely on venom for prey capture and defense. Venom regeneration in scolopendromorph centipedes likely influences their ability to subdue prey and defend themselves, and may influence the quantity and quality of venom extracted by researchers investigating the venom's biochemistry. We investigated venom volume and total protein regeneration during the 14-day period subsequent to venom extraction in the North American centipede Scolopendra polymorpha. We further tested the hypothesis that venom protein components, separated by reversed-phase fast protein liquid chromatography (RP-FPLC), undergo asynchronous (non-parallel) synthesis. During the first 48 h, volume and protein mass increased linearly. Protein regeneration lagged behind volume regeneration, with 65–86% of venom volume and 29–47% of protein mass regenerated during the first 2 days. No additional regeneration occurred over the subsequent 12 days, and neither volume nor protein mass reached initial levels 7 months later (93% and 76%, respectively). Centipede body length was negatively associated with rate of venom regeneration. Analysis of chromatograms of individual venom samples revealed that 5 of 10 chromatographic regions and 12 of 28 peaks demonstrated changes in percent of total peak area (i.e., percent of total protein) among milking intervals, indicating that venom proteins are regenerated asynchronously. Moreover, specimens from Arizona and California differed in relative amounts of some venom components. The considerable regeneration of venom occurring within the first 48 h, despite the reduced protein content, suggests that predatory and defensive capacities are minimally constrained by the timing of venom replacement.
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Junqueira-de-Azevedo ILM, Bastos CMV, Ho PL, Luna MS, Yamanouye N, Casewell NR. Venom-related transcripts from Bothrops jararaca tissues provide novel molecular insights into the production and evolution of snake venom. Mol Biol Evol 2014; 32:754-66. [PMID: 25502939 PMCID: PMC4327157 DOI: 10.1093/molbev/msu337] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Attempts to reconstruct the evolutionary history of snake toxins in the context of their co-option to the venom gland rarely account for nonvenom snake genes that are paralogous to toxins, and which therefore represent important connectors to ancestral genes. In order to reevaluate this process, we conducted a comparative transcriptomic survey on body tissues from a venomous snake. A nonredundant set of 33,000 unigenes (assembled transcripts of reference genes) was independently assembled from six organs of the medically important viperid snake Bothrops jararaca, providing a reference list of 82 full-length toxins from the venom gland and specific products from other tissues, such as pancreatic digestive enzymes. Unigenes were then screened for nontoxin transcripts paralogous to toxins revealing 1) low level coexpression of approximately 20% of toxin genes (e.g., bradykinin-potentiating peptide, C-type lectin, snake venom metalloproteinase, snake venom nerve growth factor) in body tissues, 2) the identity of the closest paralogs to toxin genes in eight classes of toxins, 3) the location and level of paralog expression, indicating that, in general, co-expression occurs in a higher number of tissues and at lower levels than observed for toxin genes, and 4) strong evidence of a toxin gene reverting back to selective expression in a body tissue. In addition, our differential gene expression analyses identify specific cellular processes that make the venom gland a highly specialized secretory tissue. Our results demonstrate that the evolution and production of venom in snakes is a complex process that can only be understood in the context of comparative data from other snake tissues, including the identification of genes paralogous to venom toxins.
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Affiliation(s)
- Inácio L M Junqueira-de-Azevedo
- Laboratório Especial de Toxinologia Aplicada, Center of Toxins, Immune-Response and Cell Signaling (CeTICS), Instituto Butantan, São Paulo, Brazil Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Carolina Mancini Val Bastos
- Laboratório Especial de Toxinologia Aplicada, Center of Toxins, Immune-Response and Cell Signaling (CeTICS), Instituto Butantan, São Paulo, Brazil Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Paulo Lee Ho
- Centro de Biotecnologia, Instituto Butantan, São Paulo, Brazil
| | | | - Norma Yamanouye
- Laboratório de Farmacologia, Instituto Butantan, São Paulo-SP, Brazil
| | - Nicholas R Casewell
- Alistair Reid Venom Research Unit, Liverpool School of Tropical Medicine, Liverpool, United Kingdom
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Smith MT, Ortega J, Beaupre SJ. Metabolic cost of venom replenishment by Prairie Rattlesnakes (Crotalus viridis viridis). Toxicon 2014; 86:1-7. [DOI: 10.1016/j.toxicon.2014.04.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 04/16/2014] [Accepted: 04/29/2014] [Indexed: 10/25/2022]
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Activation of Bothrops jararaca snake venom gland and venom production: A proteomic approach. J Proteomics 2013; 94:460-72. [DOI: 10.1016/j.jprot.2013.10.026] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 09/28/2013] [Accepted: 10/18/2013] [Indexed: 02/08/2023]
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18
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Sakai F, Carneiro SM, Yamanouye N. Morphological study of accessory gland of Bothrops jararaca and its secretory cycle. Toxicon 2012; 59:393-401. [DOI: 10.1016/j.toxicon.2011.12.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Revised: 10/22/2011] [Accepted: 12/19/2011] [Indexed: 10/14/2022]
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Pintor AF, Krockenberger AK, Seymour JE. Costs of venom production in the common death adder (Acanthophis antarcticus). Toxicon 2010; 56:1035-42. [DOI: 10.1016/j.toxicon.2010.07.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Revised: 07/13/2010] [Accepted: 07/16/2010] [Indexed: 01/22/2023]
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