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Cementing Mussels to Oysters in the Pteriomorphian Tree

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Cementing Mussels to Oysters in the Pteriomorphian Tree Downloaded from http://rspb.royalsocietypublishing.org/ on June 29, 2016 Cementing mussels to oysters in the rspb.royalsocietypublishing.org pteriomorphian tree: a phylogenomic approach Sarah Lemer1, Vanessa L. Gonza´lez2,Ru¨diger Bieler3 and Gonzalo Giribet1 Research 1Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, Cite this article: Lemer S, Gonza´lez VL, Bieler 26 Oxford Street, Cambridge, MA 02138, USA 2Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, R, Giribet G. 2016 Cementing mussels to Washington, DC 20013, USA oysters in the pteriomorphian tree: a phylo- 3Integrative Research Center, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, genomic approach. Proc. R. Soc. B 283: IL 60605, USA 20160857. SL, 0000-0003-0048-7296 http://dx.doi.org/10.1098/rspb.2016.0857 Mussels (Mytilida) are a group of bivalves with ancient origins and some of the most important commercial shellfish worldwide. Mytilida consists of approxi- mately 400 species found in various littoral and deep-sea environments, and are Received: 15 April 2016 part of the higher clade Pteriomorphia, but their exact position within the group Accepted: 3 June 2016 has been unstable. The multiple adaptive radiations that occurred within Pteriomorphia have rendered phylogenetic classifications difficult and uncer- tainty remains regarding the relationships among most families. To address this phylogenetic uncertainty, novel transcriptomic data were generated to include all five orders of Pteriomorphia. Our results, derived from complex ana- Subject Areas: lyses of large datasets from 41 transcriptomes and evaluating possible pitfalls evolution, genomics, taxonomy and affecting phylogenetic reconstruction (matrix occupancy, heterogeneity, evol- systematics utionary rates, evolutionary models), consistently recover a well-supported phylogeny of Pteriomorphia, with the only exception of the most complete but smallest data matrix (Matrix 3: 51 genes, 90% gene occupancy). Keywords: Maximum-likelihood and Bayesian mixture model analyses retrieve strong sup- phylogenomics, genome, phylogeny, Mollusca, port for: (i) the monophyly of Pteriomorphia, (ii) Mytilida as a sister group to Bivalvia, evolutionary rate Ostreida, and (iii) Arcida as sister group to all other pteriomorphians. The basal position of Arcida is congruent with its shell microstructure (solely com- posed of aragonitic crystals), whereas Mytilida and Ostreida display a combination of a calcitic outer layer with an aragonitic inner layer composed Author for correspondence: of nacre tablets, the latter being secondarily lost in Ostreoidea. Sarah Lemer e-mail: [email protected] 1. Introduction Mussels (the members of the superfamily Mytiloidea) are a ubiquitous and common group of bivalves and a main source of protein for humans and non-human animals alike. Despite being the dominant organisms in many littoral, shallow sub-littoral, deep-sea hydrothermal vent and cold seep ecosys- tems [1]—including rocky and sediment shores on open coasts and in estuaries and marshes [2]—the position of mussels in relation to other pteriomorphian bivalves remains unresolved (e.g. [3]). Because of their economic and ecological importance, mussels have been the subject of considerable research effort. Taxonomically, Mytiloidea is a diverse group of pteriomorphian bivalves recog- nized by characteristics of shell form, hinge and mussel attachment scars [4]. Mytilidae, by most authors considered the only family in the superfamily Mytiloidea and the order Mytilida (but see Carter [5]), is an ancient group with roots extending to the Devonian [6]. It comprises eight recognized extant subfamilies [7,8], with approximately 400 species worldwide [9], Electronic supplementary material is available probably constituting the largest family of bivalves in number of species. at http://dx.doi.org/10.1098/rspb.2016.0857 or Like mussels, in particular, bivalves of the subclass Pteriomorphia in general form a commercially important clade with species harvested and cultured via http://rspb.royalsocietypublishing.org. worldwide both for food (e.g. oysters, scallops, ark shells), and ornament & 2016 The Author(s) Published by the Royal Society. All rights reserved. Downloaded from http://rspb.royalsocietypublishing.org/ on June 29, 2016 w industry (pearl oysters). They are characterized by a large RNAlater (Life Technologies, Carlsbad, CA, USA) and stored at 2 variability in ligament structure and in shell size, shape and 2808C. Total RNA was extracted using TRIzol (Life Sciences) rspb.royalsocietypublishing.org composition. Some shells are constituted of aragonite tablets and purification of mRNA was performed using the Dynabeads only (e.g. Arcida), others of calcite crystals (e.g. Ostreoidea), (Invitrogen) following the manufacturer’s instructions and as whereas some species present a shell that has both crystal described in [28]. For each sample, quality of mRNA was assessed with a picoRNA assay in an Agilent 2100 Bioanalyzer (Agilent forms of calcium carbonate, calcite and aragonite (e.g. Myti- Technologies) and quantity measured with an RNA assay in a lida, Pectinida, Limida, Pinnoidea and Pterioidea) [10]. Qubit fluorometer (Life Technologies). Shell composition is important because most pteriomor- All cDNA libraries were constructed using the PrepX mRNA phians are sessile as adults, their calcified shells being the kit for Apollo 324 (Wafergen). Libraries were sequenced on the only mechanism against predation and desiccation [11]. In Illumina HiSeq 2500 platform with paired-end reads of 150 bp addition, understanding the evolution of shell formation at the FAS Center for Systems Biology at Harvard University, can help assess the impacts of ocean acidification on bivalves. after their concentration and quality were assessed. Proc. R. Soc. B Pteriomorphia appears in the fossil record in the Early Ordovician where mytiloid, arcoid and pterioid forms are (b) Transcriptome assembly recognized. These groups experienced periods of radiating All reads generated for this study are deposited in the National diversification in the Late Devonian, as well as in the begin- Center for Biotechnology Information Sequence Read Archive 283 ning and the end of the Mesozoic [12]. The diversity of this (NCBI-SRA; electronic supplementary material, table S1). Each : 20160857 group reflects several adaptive radiations and the shell sample, except for the genome of Pinctada fucata, was prepared forms have attracted the interest of many palaeontologists as in [28], as detailed in the electronic supplementary material, and neontologists (e.g. [13–21]). The multiple adaptive radi- S2. De novo assemblies were conducted for each sample with ations have rendered phylogenetic classifications difficult Trinity r2014-04-13 [30,31] using paired read files and default owing to convergence and/or parallel evolution at various parameters except for ‘–path_reinforcement_distance 50’, which levels [22]. Although the most recent phylogenies agree on seems to produce slightly better assemblies, with higher N50 the monophyly of Pteriomorphia, uncertainty remains values and longer contigs. Reduction of redundant reads, regarding the internal relationships of the majority of pterio- peptide prediction and peptide filtration were conducted as in [28] (detailed in the electronic supplementary material, S2). morphian clades (families and superfamilies), despite considerable phylogenetic (e.g. [16,18,23–27]) and even recent phylogenomic [28] efforts. (c) Orthology assignment and matrix construction Pteriomorphia comprises five widely recognized extant Orthology assignment for the dataset assemblies was performed orders (Arcida, Limida, Mytilida, Ostreida and Pectinida) [27]. using stand-alone OMA v. 0.99z.2 [32,33] (detailed parameters in Among the most unstable results in bivalve phylogeny are the the electronic supplementary material, S2). Three initial data relative positions of Arcida and Mytilida ([3,29]). As one of the matrices following occupancy thresholds [34] were generated most diverse and studied bivalve groups, it is unsettling that for phylogenetic analyses: the first one, Matrix 1, targeting a to this day relationships among pteriomorphians in general minimum gene occupancy of 50%, was constructed by selecting the OMA orthogroups present in 24 or more taxa (1205 and mytiloids in particular remain unresolved, impinging on orthogroups). Matrix 2 includes orthogroups present in 36 or future studies aiming at exploring extinction, diversification more taxa (gene occupancy greater than 75%; 277 orthogroups). and biogeographic patterns of this group, including dating Matrix 3 was constructed by selecting the orthogroups found in and inference of the evolution of lineages through time. With 44 or more taxa (greater than 90% gene occupancy; 51 the aim of improving resolution within Pteriomorphia, we gen- orthogroups). The orthogroup selection based on minimum erated a novel Illumina-based dataset to evaluate the internal taxon occupancy was executed using a custom Python script branching patterns of this clade from a fresh perspective and (all scripts and data matrices are available online at https://data infer on the evolution of shell microstructure within pteriomor- verse.harvard.edu/dataverse/Pteriomorphia_phylogenomics). phians. For this, we sequenced, assembled and analysed 12 new Alignments were generated for each matrix using MUSCLE v. 3.6 pteriomorphian
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