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Extreme Halophilic Archaea Derive from Two Distinct Methanogen Class

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Extreme Halophilic Archaea Derive from Two Distinct Methanogen Class Extreme halophilic archaea derive from two distinct methanogen Class II lineages Monique Aouad, Najwa Taïb, Anne Oudart, Michel Lecocq, Manolo Gouy, Céline Brochier-Armanet To cite this version: Monique Aouad, Najwa Taïb, Anne Oudart, Michel Lecocq, Manolo Gouy, et al.. Extreme halophilic archaea derive from two distinct methanogen Class II lineages. Molecular Phylogenetics and Evolution, Elsevier, 2018, 127, pp.46-54. 10.1016/j.ympev.2018.04.011. hal-01799910 HAL Id: hal-01799910 https://hal.archives-ouvertes.fr/hal-01799910 Submitted on 25 May 2018 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Molecular Phylogenetics and Evolution 127 (2018) 46–54 Contents lists available at ScienceDirect Molecular Phylogenetics and Evolution journal homepage: www.elsevier.com/locate/ympev Extreme halophilic archaea derive from two distinct methanogen Class II T lineages Monique Aouad1, Najwa Taib1, Anne Oudart, Michel Lecocq, Manolo Gouy, ⁎ Céline Brochier-Armanet Univ Lyon, Université Lyon 1, CNRS, UMR5558, Laboratoire de Biométrie et Biologie Évolutive, 43 bd du 11 novembre 1918, F-69622 Villeurbanne, France ARTICLE INFO ABSTRACT Keywords: Phylogenetic analyses of conserved core genes have disentangled most of the ancient relationships in Archaea. Stenosarchaea However, some groups remain debated, like the DPANN, a deep-branching super-phylum composed of nanosized Compositional bias archaea with reduced genomes. Among these, the Nanohaloarchaea require high-salt concentrations for growth. Long branch attraction Their discovery in 2012 was significant because they represent, together with Halobacteria (a Class belonging to Slow-fast method Euryarchaeota), the only two described lineages of extreme halophilic archaea. The phylogenetic position of Rate signal Nanohaloarchaea is highly debated, being alternatively proposed as the sister-lineage of Halobacteria or a Substitutional saturation member of the DPANN super-phylum. Pinpointing the phylogenetic position of extreme halophilic archaea is important to improve our knowledge of the deep evolutionary history of Archaea and the molecular adaptive processes and evolutionary paths that allowed their emergence. Using comparative genomic approaches, we identified 258 markers carrying a reliable phylogenetic signal. By combining strategies limiting the impact of biases on phylogenetic inference, we showed that Nanohaloarchaea and Halobacteria represent two independent lines that derived from two distinct but related methanogen Class II lineages. This implies that adaptation to high salinity emerged twice independently in Archaea and indicates that emergence of Nanohaloarchaea within DPANN in previous studies is likely the consequence of a tree reconstruction artifact, challenging the existence of this super-phylum. 1. Introduction Similar to Halobacteria, Nanohaloarchaea could use the “salt-in” strategy, which involves the accumulation of molar concentrations of Archaea gather many lineages with very diverse metabolic capa- potassium and chloride within cells (Oren, 2008), to maintain their cities and living in a broad range of ecosystems, including the human osmotic balance (Narasingarao et al., 2012). This generates strong body (Eme and Doolittle, 2015). Recent advances in high-throughput constrains on intracellular proteins and cellular apparatus, and requires sequencing technologies have revealed many new major uncultured specific adaptations. In fact, proteins of extreme halophiles are depleted environmental groups, most of them being known only through ribo- in large hydrophobic residues (Wright et al., 2002) and accumulate somal RNA or genomic sequences (Castelle et al., 2015; Rinke et al., negative charges at their surface to maintain proper conformation and 2013; Schleper et al., 2005). This is for instance the case of Nanoha- activity, and prevent aggregation (Ban et al., 2000; Britton et al., 2006). loarchaea, a group of extreme halophilic nanosized archaea (< 0.8 µm However, Nanohaloarchaea show differences with Halobacteria, pre- diameter), discovered recently in Lake Tyrell, Australia (Narasingarao ferring glutamic acid to aspartic acid, serine to threonine, and reduced et al., 2012), and detected in Spanish solar salterns (Ghai et al., 2011). frequencies of proline and histidine (Narasingarao et al., 2012). They Environmental surveys indicated that Nanohaloarchaea exist worldwide have also smaller genomes (approximately 1.2 Mb), a single-copy rRNA (Narasingarao et al., 2012). This discovery was significant because, at operon, and globally a lower G+C genomic content (Narasingarao the time, extreme halophilic archaea were restricted to Halobacteria,a et al., 2012). euryarchaeotal class of heterotrophs (Oren, 2014, 2008). Thus, Nano- The phylogenetic position of extreme halophilic archaea is still haloarchaea represent the second lineage of extreme halophilic archaea unresolved. Phylogenetic analyses of the RNA component of the small described so far. subunit of the ribosome and large supermatrices of conserved core ⁎ Corresponding author. E-mail address: [email protected] (C. Brochier-Armanet). 1 The two authors have equally contributed to the work. https://doi.org/10.1016/j.ympev.2018.04.011 Received 17 October 2017; Received in revised form 12 March 2018; Accepted 9 April 2018 Available online 21 April 2018 1055-7903/ © 2018 Elsevier Inc. All rights reserved. M. Aouad et al. Molecular Phylogenetics and Evolution 127 (2018) 46–54 genes have revealed a close relationship between Halobacteria and that the grouping of Nanohaloarchaea with DPANN lineages is likely the methanogen Class II, a group encompassing Methanomicrobiales, consequence of a tree reconstruction artifact, challenging the existence Methanosarcinales and Methanocellales, and indicated that Halobacteria of this candidate super-phylum. could derive from a methanogenic ancestor (Forterre et al., 2002). However, the identity of the closest relative of Halobacteria remains 2. Materials and methods debated (Supplementary Table S1). In fact, recently published large scale phylogenomic analyses supported Halobacteria as the sister- 2.1. Dataset assembly lineage of the whole methanogen Class II lineage (Gao and Gupta, 2007; Nelson-Sathi et al., 2012; Wolf et al., 2012; Yutin et al., 2012), of Me- 155 complete (or nearly complete) proteomes of 102 Halobacteria,3 thanomicrobiales (Brochier-Armanet et al., 2011; Petitjean et al., 2015; Methanocellales,12Methanomicrobiales,15Methanosarcinales,3 Raymann et al., 2015; Williams et al., 2017), or of Methanocellales Nanohaloarchaea, 1 ANME-I, 7 Archeaoglobales and 12 Diaforarchaea (Becker et al., 2014; Petitjean et al., 2014; Adam et al., 2017). Re- were retrieved at the NCBI (www.ncbi.nlm.nih.gov) and gathered in a garding Nanohaloarchaea, some studies suggested that they represent local database (Supplementary Table S2). Pairwise comparisons of the the sister-lineage of Halobacteria (Narasingarao et al., 2012; Petitjean corresponding 539,902 protein sequences were performed with BLASTP et al., 2014), while other analyses, based on different sets of markers, version 2.2.26 (Altschul et al., 1997) (default parameters, excepted the different methods and/or different taxonomic samplings, suggested filter of low complexity regions that was turned off) and used to as- instead that Nanohaloarchaea belong to the recently proposed DPANN semble homologous protein families with SILIX version 1.2.9 (Miele super-phylum (Castelle et al., 2015; Rinke et al., 2013; Williams et al., et al., 2011). More precisely, protein sequences displaying more than 2017; Williams and Embley, 2014) (Supplementary Table S1). This 45% of identity and 80% of sequence coverage were gathered in the super-phylum, distinct from the two other main archaeal lineages (i.e. same family. The inferred protein families were refined using HIFIX the Euryarchaeota and the Thaumarchaeota-Aigarchaeota-Crenarchaeota- version 1.0.5 (Miele et al., 2012), which performs a three-step high- Korarchaeota (TACK) super-phylum) encompasses diverse, fast evol- quality sequence clustering guided by network topology and multiple ving, and possibly nanosized archaea (e.g. Diapherotrites, Parvarchaeota, alignment likelihood. This led to the assembly of 108,007 protein fa- Micrarchaeota, Aenigmarchaeota, Nanoarchaeota, Woesearchaeota, Pa- milies. Among these, 106,688 presented a narrow taxonomic distribu- cearchaeota) and was proposed to represent the first diverging lineage tion (i.e. being present in less than 85 proteomes) or corresponded to within Archaea. Other studies, such as the analysis performed by multigenic protein families (i.e. containing more than 200 sequences) Raymann et al (2014) challenges the DPANN hypothesis, as in this with many paralogues and complex evolutionary histories. The re- study nanosized lineages do not form a monophyletic group due to the maining 1319 families were accurately aligned with MAFFT version grouping of Micrarchaeum acidiphilum with Thermococcales and Metha- 7.215 using the L-INS-I option (Kazutaka
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