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An Analysis of the Secondary Structure of the Mitochondrial Large Subunit Rrna Gene (16S) in Spiders and Its Implications for Phylogenetic Reconstruction

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An Analysis of the Secondary Structure of the Mitochondrial Large Subunit Rrna Gene (16S) in Spiders and Its Implications for Phylogenetic Reconstruction University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications in the Biological Sciences Papers in the Biological Sciences 2003 An Analysis of the Secondary Structure of the Mitochondrial Large Subunit rRNA Gene (16S) in Spiders and Its Implications for Phylogenetic Reconstruction Stacey DeWitt Smith University of Nebraska - Lincoln, [email protected] Jason E. Bond East Carolina University Follow this and additional works at: https://digitalcommons.unl.edu/bioscifacpub Part of the Life Sciences Commons Smith, Stacey DeWitt and Bond, Jason E., "An Analysis of the Secondary Structure of the Mitochondrial Large Subunit rRNA Gene (16S) in Spiders and Its Implications for Phylogenetic Reconstruction" (2003). Faculty Publications in the Biological Sciences. 111. https://digitalcommons.unl.edu/bioscifacpub/111 This Article is brought to you for free and open access by the Papers in the Biological Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications in the Biological Sciences by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. 2003. The Journal of Arachnology 31:44±54 AN ANALYSIS OF THE SECONDARY STRUCTURE OF THE MITOCHONDRIAL LARGE SUBUNIT rRNA GENE (16S) IN SPIDERS AND ITS IMPLICATIONS FOR PHYLOGENETIC RECONSTRUCTION Stacey D. Smith1: Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 USA Jason E. Bond: East Carolina University, Department of Biology, Howell Science Complex, Greenville, North Carolina 27858 USA ABSTRACT. We investigated the pattern of molecular variation with respect to secondary structure in the 16S ribosomal RNA gene and its phylogenetic implications for arachnids with a focus on spiders. Based on a model by Gutell et al. (1996), secondary structures were proposed for the 39 half of 16S in the mygalomorph spider Aptostichus atomarius. Models were also constructed for a hypervariable length of the 16S in three other arachnids, which revealed a trend of stem and loop reduction in more advanced arachnids. Using a simple statistical approach to compare functional regions, we found that internal and external loops are more variable than stems or connection regions. Down-weighting or excluding regions which code for the more variable loops improved tree topologies by restoring the monophyly of the genus Aptostichus, a group supported by combined 16S, COI, and morphological data in other analyses. This study demonstrated the utility of considering secondary structure for DNA sequence alignment and phy- logenetic reconstruction in spiders. Keywords: Secondary structure, 16S rRNA gene, Aptostichus, phylogenetic utility The most important aspect of any molecular The 16S rRNA gene, which encodes the phylogenetic study is, unequivocally, gene mitochondrial large ribosomal subunit (mt choice. Choosing a gene that strikes the ap- LSU) in animals, has been employed exten- propriate balance between molecular conser- sively to explore phylogenetic relationships in vation and variability is essential to the suc- arthropods at most phylogenetic levels [e.g., cess of phylogenetic reconstruction. Without ordinal (e.g., Flook & Rowell 1995), familial question the functional role of a gene and its level (e.g., Black & Piesman 1994) and the rate of evolution are tightly coupled although genus level and below (e.g., DeSalle et al. within genes, this relationship is variable be- 1992; Bond et al. 2001)]. The wide range in cause regions of a single gene can evolve at utility of 16S at various taxonomic levels sug- different rates. This tight relationship between gests that the differential rates of molecular rate of nucleotide substitution and gene com- evolution within 16S, due to varying func- ponent ``form and function'' results in a single tional constraints, greatly affect its phyloge- gene being useful at different, sometimes netic utility. Thus, understanding the function- quite disparate phylogenetic levels. Such mul- al roles of different portions of the gene tilevel phylogenetic utility, strongly tied to through secondary structure modeling should gene function (i.e., the functional secondary lead to a more robust use of 16S in phyloge- structure) is particularly true for the mito- netic studies. chondrial 16S rRNA gene in arthropods The main focus of this paper is the second- (Flook & Rowell 1995), the gene of focus for ary structure of 16S in spiders and other this paper. arachnids. One of the ®rst models of 16S sec- 1 Current address: Stacey D. Smith, Department of ondary structure in arthropods was created by Botany, 430 Lincoln Dr., University of Wisconsin, Clary & Wolstenholme (1985) using the Dro- Madison, WI 53706-1481. E-mail: sdsmith4@ sophila yakuba sequence. Subsequent models wisc.edu by Gutell and colleagues (Gutell & Fox 1988; 44 SMITH & BONDÐSPIDER 16S SECONDARY STRUCTURE 45 Table 1.ÐSpider taxa sampled. Higher level Reference/GenBank classi®cation Species Origin accession # Mesothelae Liphistiidae Heptathela nishihirai Haupt 1979 Japan Huber et al. 1993 Opisthothelae Araneomorphae Clubionidae Clubiona pallidula (Clerck 1757) Austria Huber et al. 1993 Ctenidae Cupiennius coccineus F. Pickard-Cam- Costa Rica Huber et al. 1993 bridge 1901 Ctenidae Cupiennius getazi Simon 1891 Costa Rica Huber et al. 1993 Ctenidae Cupiennius salei (Keyserling 1877) Mexico Huber et al. 1993 Ctenidae Phoneutria boliviensis (F.O. Pickard- Costa Rica Huber et al. 1993 Cambridge 1897) Lycosidae Pardosa agrestis (Westring 1861) Austria Huber et al. 1993 Pisauridae Dolomedes ®mbriatus (Clerck 1757) Austria Huber et al. 1993 Pisauridae Pisaura mirabilis (Clerck 1757) Austria Huber et al. 1993 Mygalomorphae Antrodiaetidae Antrodiaetus unicolor (Hentz 1841) Virginia AY241258 Cyrtaucheniidae Aptostichus atomarius Simon 1891 California AY241254 Cyrtaucheniidae Aptostichus simus Chamberlin 1917 (3 California AF307969, populations sampled, Bond et al. AF307964, 2001) AF307960 Cyrtaucheniidae Aptostichus sp. California AY241255 Cyrtaucheniidae Entychides arizonicus Gertsch & Wal- Arizona AY241257 lace 1936 Cyrtaucheniidae Promyrmekiaphila gertschi Schenkel California AY241256 1950 Gutell et al. 1993) were based on extensive used in this analysis, the classi®catory place- surveys of sequences as well as studies of po- ment of these taxa, and the source of their sitional covariance; these are thus considered sequences. Decisions regarding taxon choice to be more accurate and have been used in within the Mygalomorphae re¯ect an attempt recent studies modeling secondary structure in to examine taxa across a number of phyloge- arthropods (e.g. Buckley et al. 2000). Existing netic levels within this clade. secondary structure models of 16S in arach- The major objectives of this study are to: nids are limited to a tick (Black & Piesman 1) construct a secondary structure model for 1994), which used the Clary & Wolstenholme mygalomorph spiders using the preferred Gu- (1985) model and two spider species of the tell model, 2) examine trends in secondary infraorder Araneomorphae (Huber et al. 1993; structure evolution in spiders and other arach- Masta 2000), which used the Gutell model nids, 3) analyze the pattern of molecular var- (Gutell & Fox 1988). To obtain a more com- iation with respect to structure in mygalo- plete picture of arachnid 16S secondary struc- morphs and araneomorphs, and 4) assess the ture, this study will examine the secondary effects that differential weighting of molecular structure of the other ``primitive'' infraorder characters based on secondary structure has of spiders, the Mygalomorphae (Coddington on phylogeny reconstruction in spiders. This & Levi 1991), and, to a lesser extent, primi- is the ®rst study of arachnids to examine the tive liphistiid spiders, Acari (ticks) and Scor- rates of variation in 16S rRNA relative to sec- piones using the Gutell model. Spider taxa ondary structure in a rigorous statistical man- from disparate groups were examined as part ner and to analyze secondary structure trends of a concerted effort to sample across all of across the class. It is also the ®rst to consider the major clades. Table 1 summarizes the taxa the implications of secondary structure in se- 46 THE JOURNAL OF ARACHNOLOGY quence alignment and phylogenetic recon- that the location of stems and loops would be struction in arachnids. very similar because the LSU rRNA second- ary structure has been found to be widely con- METHODS served (Buckley et al. 2000; Masta 2000). The DNA extractions.ÐTotal genomic DNA A. atomarius sequence was chosen because it was extracted from leg tissue using a Pure- had the highest similarity to Drosophila, fa- gene DNA extraction kit, which comprises a cilitating comparison. lysis step in which ground tissue is incubated To examine evolution of secondary struc- in Tris-EDTA buffer with SDS and Proteinase ture in arachnids, models were also created for K for three hours, a protein precipitation step a hypervariable portion of the molecule (Fig. using potassium acetate, followed by DNA 1) in distantly related arachnid taxa: the tick precipitation in isopropanol, and a 70% etha- Ornithodoros moubata (Murray 1877) (Black nol wash. DNA was resuspended in Tris- & Piesman 1994), the scorpion Vaejovis car- EDTA buffer and diluted 1:100 for subsequent olianus (Beauvois 1805) and the mesothele reactions. Heptathela nishihirai Haupt 1979 (Huber et Mitochondrial gene PCR and sequenc- al. 1993) (Fig. 2). All structures were drawn
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