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Molecular Diversity and Gene Evolution of the Venom Arsenal of Terebridae Predatory Marine Snails

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Molecular Diversity and Gene Evolution of the Venom Arsenal of Terebridae Predatory Marine Snails GBE Molecular Diversity and Gene Evolution of the Venom Arsenal of Terebridae Predatory Marine Snails Juliette Gorson1,2,y, Girish Ramrattan1,y,AidaVerdes1,2,y, Elizabeth M. Wright1,2,y,YuriKantor3,4, Ramakrishnan Rajaram Srinivasan5, Raj Musunuri5, Daniel Packer1,GabrielAlbano6,Wei-GangQiu1,and Mande¨ Holford1,2,* 1Hunter College and The Graduate Center, City University of New York 2Invertebrate Zoology, Sackler Institute for Comparative Genomics, American Museum of Natural History, New York 3A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia 4Visiting Professor, Muse´um National d’Histoire Naturelle, Paris, France 5Department of Bioinformatics, New York University Polytechnic School of Engineering Downloaded from 6Estac¸a˜odeBiologiaMarı´tima da Inhaca (EBMI), Faculdade de Ciencias, Universidade Eduardo Mondlane, Distrito Municipal KaNyaka, Maputo, Mozambique *Corresponding author: E-mail: [email protected]. y These authors contributed equally to this work. http://gbe.oxfordjournals.org/ Accepted: May 23, 2015 Data deposition: All RNA-Seq sequence reads used were submitted to NCBI SRA with BioProject ID 286256. DNA sequences used to generate phylogenies were deposited in GenBank. Accession numbers are provided in supplementary table S3, Supplementary Material online. Abstract Venom peptides from predatory organisms are a resource for investigating evolutionary processes such as adaptive radiation or at Hunter College Library on February 25, 2016 diversification, and exemplify promising targets for biomedical drug development. Terebridae are an understudied lineage of con- oidean snails, which also includes cone snails and turrids. Characterization of cone snail venom peptides, conotoxins, has revealed a cocktail of bioactive compounds used to investigate physiological cellular function, predator-prey interactions, and to develop novel therapeutics. However, venom diversity of other conoidean snails remains poorly understood. The present research applies a venomics approach to characterize novel terebrid venom peptides, teretoxins, from the venom gland transcriptomes of Triplostephanus anilis and Terebra subulata. Next-generation sequencing and de novo assembly identified 139 putative teretoxins that were analyzed for the presence of canonical peptide features as identified in conotoxins. To meet the challenges of de novo assembly, multiple approaches for cross validation of findings were performed to achieve reliable assemblies of venom duct tran- scriptomes and to obtain a robust portrait of Terebridae venom. Phylogenetic methodology was used to identify 14 teretoxin gene superfamilies for the first time, 13 of which are unique to the Terebridae. Additionally, basic local algorithm search tool homology- based searches to venom-related genes and posttranslational modification enzymes identified a convergence of certain venom proteins, such as actinoporin, commonly found in venoms. This research provides novel insights into venom evolution and recruitment in Conoidean predatory marine snails and identifies a plethora of terebrid venom peptides that can be used to investigate funda- mental questions pertaining to gene evolution. Key words: venomics, venom evolution, Terebridae, teretoxins, transcriptomics, Conoidea. Introduction Animal venoms are among the most complex biochemical Venom is widely spread throughout the animal kingdom, natural secretions known and comprise a mixture of bioactive mostly as a foraging adaptation, such as in most predatory compounds often referred to as toxins (Norton and Olivera mammals, snakes, spiders, scorpions, cephalopods, and gas- 2006; Vonk et al. 2013; von Reumont et al. 2014). Despite tropods, but also as a defensive mechanism as in some lizards, their complexity, there is a high degree of convergence fishes, echinoderms, and insects (Casewell et al. 2013). throughout the animal kingdom in the basic molecular ß The Author(s) 2015. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact [email protected] Genome Biol. Evol. 7(6):1761–1778. doi:10.1093/gbe/evv104 Advance Access publication May 28, 2015 1761 Gorson et al. GBE structure and targets of venom toxins, which include most apparatus to inject a cocktail of peptide toxins to rapidly im- major physiological pathways and tissues accessible by blood mobilize their prey. The conoidean venom apparatus includes (Escoubas and King 2009; Casewell et al. 2013). These fea- a convoluted tubular venom gland with a muscular bulb, pro- tures make venom an extremely successful evolutionary inno- pulsing the venomous secretion. Conoidea have evolved a vation, whose components are ideal candidates for drug peculiar mechanism of using marginal radular teeth for stab- discovery and therapeutic development (Fry and Wu¨ster bing the prey, and in some groups the latter are modified in 2004; Twede et al. 2009; Puillandre and Holford 2010). hypodermic needles to inject venom into the prey (Tayloretal. Despite their great potential as model systems for a diverse 1993; Kantor and Taylor 2000; Holford, Puillandre, Modica, array of biological areas, including molecular evolution (Duda et al. 2009; Holford, Puillandre, Terryn, et al. 2009; Castelin and Palumbi 1999, 2000; Vonk et al. 2013), functional con- et al. 2012). Not all terebrids have a venom apparatus, and at vergence (Fry et al. 2009), drug discovery (Escoubas and King least three different hunting physiologies are described for this 2009; Koh and Kini 2012), or structural biology (Tsetlin 1999; family (Miller 1970). Recent studies have facilitated the iden- Terlau and Olivera 2004; Dutertre and Lewis 2010), most ven- tification of terebrid lineages that produce venom by correlat- Downloaded from omous animals remain understudied. However, in the post- ing the molecular phylogeny of the Terebridae to the genomic era, the concept of a model system is rapidly evolving evolution of its venom apparatus (Holford, Puillandre, and venomous organisms, such as the Terebridae, are an at- Modica, et al. 2009; Holford, Puillandre, Terryn, et al. 2009; tractive option for investigating gene evolution, particularly in Castelin et al. 2012). Using this biodiversity derived discovery venomics research. approach, Tr. anilis and Te. subulata were selected for venom http://gbe.oxfordjournals.org/ With the decreasing costs and increasing efficiency of next- characterization, as they are representatives of a clade that has generation sequencing (NGS) techniques, molecular and func- a similar venom apparatus to that of cone snails and produce tional genomic studies enable venomous taxa, such as the venom peptides to subdue their prey. predatory snails of the Conoidea superfamily, to become This study provides the first, to our knowledge, NGS tran- model organisms in the drug discovery arena (fig. 1). The scriptome analysis of Terebridae venom ducts to investigate globally distributed Conoidea, which includes Conidae terebrid venom composition. Terebrids express a diverse array (~800 species), Terebridae (~400 species), and Turridae of hypervariable disulfide-rich peptide toxins, teretoxins,which (~3,000 species), is one of the most diverse groups of venom- come in an assortment of molecular scaffolds that are signif- at Hunter College Library on February 25, 2016 ous organisms in the marine realm and the enormous variety icantly different from conotoxins (Imperial et al. 2007; of conoidean venom peptide toxins greatly outnumber that of Puillandre and Holford 2010; Kendel et al. 2013; Anand snakes, a pharmaceutical industry favorite due to ease of col- et al. 2014). Several novel putative Tr. anilis and Te. subulata lection and quantity of available venom (Escoubas and King teretoxin precursors are identified, and the evolutionary rela- 2009). The Conoidea, divided into 16 families, have been per- tionships and possible origins of several venom toxin families fecting the art of the hunt for over 50 Myr (Bandyopadhyay (e.g., conopressin, actinoporin) with terebrid homologs are ex- et al. 2006; Puillandre et al. 2008; Bouchet et al. 2011). A amined through phylogenetic methodologies. Additionally, a notable example of cone snail venom characterization is the preliminary classification of teretoxin gene superfamilies is pro- discovery and development of the analgesic therapeutic zico- posed, based mainly on the molecular evolution and cysteine notide (Prialt, Jazz Pharmaceuticals) (Miljanich 1997, 2004; (Cys) framework of venom peptide genes. The putative tere- Olivera 2000). Given their potential, cone snails and conotox- toxins identified enhance the number of proteins convergently ins have been investigated for several decades, but represent recruited in venom and be can be used to investigate the only a fraction of the species richness found in the larger evolution and possible origins of terebrid venom peptides. Conoidean superfamily. Characterization of the monophyletic Terebridae, an understudied and very diverse lineage of Conoidea, would identify venom peptides distinct from cone Materials and Methods snails that can be used to study molluscan species and venom Sample Collection diversification,
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