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Genome Data Provides High Support for Generic Boundaries in Burkholderia Sensu Lato

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Genome Data Provides High Support for Generic Boundaries in Burkholderia Sensu Lato fmicb-08-01154 March 1, 2018 Time: 19:4 # 1 ORIGINAL RESEARCH published: 26 June 2017 doi: 10.3389/fmicb.2017.01154 Genome Data Provides High Support for Generic Boundaries in Burkholderia Sensu Lato Chrizelle W. Beukes1, Marike Palmer1, Puseletso Manyaka1, Wai Y. Chan1, Juanita R. Avontuur1, Elritha van Zyl1, Marcel Huntemann2, Alicia Clum2, Manoj Pillay2, Krishnaveni Palaniappan2, Neha Varghese2, Natalia Mikhailova2, Dimitrios Stamatis2, T. B. K. Reddy2, Chris Daum2, Nicole Shapiro2, Victor Markowitz2, Natalia Ivanova2, Nikos Kyrpides2, Tanja Woyke2, Jochen Blom3, William B.Whitman4, Stephanus N. Venter1* and Emma T. Steenkamp1 1 Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa, 2 DOE Joint Genome Institute, Walnut Creek, CA, United States, 3 Bioinformatics and Systems Biology, Justus-Liebig-University Giessen, Giessen, Germany, 4 Department of Microbiology, University of Georgia, Athens, GA, United States Edited by: Sabela Balboa Méndez, Although the taxonomy of Burkholderia has been extensively scrutinized, significant Universidade de Santiago uncertainty remains regarding the generic boundaries and composition of this large de Compostela, Spain and heterogeneous taxon. Here we used the amino acid and nucleotide sequences Reviewed by: Paulina Estrada De Los Santos, of 106 conserved proteins from 92 species to infer robust maximum likelihood Instituto Politécnico Nacional, Mexico phylogenies with which to investigate the generic structure of Burkholderia sensu lato. Radhey S. Gupta, These data unambiguously supported five distinct lineages, of which four correspond McMaster University, Canada to Burkholderia sensu stricto and the newly introduced genera Paraburkholderia, *Correspondence: Stephanus N. Venter Caballeronia, and Robbsia. The fifth lineage was represented by P. rhizoxinica. Based [email protected] on these findings, we propose 13 new combinations for those species previously described as members of Burkholderia but that form part of Caballeronia. These findings Specialty section: This article was submitted to also suggest revision of the taxonomic status of P. rhizoxinica as it is does not form Evolutionary and Genomic part of any of the genera currently recognized in Burkholderia sensu lato. From a Microbiology, a section of the journal phylogenetic point of view, Burkholderia sensu stricto has a sister relationship with the Frontiers in Microbiology CaballeroniaCParaburkholderia clade. Also, the lineages represented by P. rhizoxinica Received: 20 April 2017 and R. andropogonis, respectively, emerged prior to the radiation of the Burkholderia Accepted: 07 June 2017 sensu strictoCCaballeroniaCParaburkholderia clade. Our findings therefore constitute a Published: 26 June 2017 solid framework, not only for supporting current and future taxonomic decisions, but also Citation: Beukes CW, Palmer M, Manyaka P, for studying the evolution of this assemblage of medically, industrially and agriculturally Chan WY, Avontuur JR, van Zyl E, important species. Huntemann M, Clum A, Pillay M, Palaniappan K, Varghese N, Keywords: Burkholderia, Paraburkholderia, Caballeronia, phylogenomics, Robbsia andropogonis, Burkholderia Mikhailova N, Stamatis D, rhizoxinica Reddy TBK, Daum C, Shapiro N, Markowitz V, Ivanova N, Kyrpides N, Woyke T, Blom J, Whitman WB, INTRODUCTION Venter SN and Steenkamp ET (2017) Genome Data Provides High Support The genus Burkholderia was originally introduced to accommodate an assemblage of seven for Generic Boundaries in Burkholderia Sensu Lato. Pseudomonas species (Yabuuchi et al., 1992), two of which were later transferred to Ralstonia Front. Microbiol. 8:1154. (Gillis et al., 1995; Yabuuchi et al., 1995). Since then, the number of Burkholderia species has doi: 10.3389/fmicb.2017.01154 grown substantially, to about 108 in 2015 (Estrada-de los Santos et al., 2016), spanning a range of Frontiers in Microbiology| www.frontiersin.org 1 June 2017| Volume 8| Article 1154 fmicb-08-01154 March 1, 2018 Time: 19:4 # 2 Beukes et al. Generic Boundaries in Burkholderia Sensu Lato human, animal and plant pathogens, as well as numerous available in the public domain. To increase representation of strains with significant biotechnological potential (Depoorter the so-called environmental species, we also determined the et al., 2016; Estrada-de los Santos et al., 2016). The latter sequences for eight additional taxa via Phase III of the GEBA includes the so-called plant beneficial and environmental (Genomic Encyclopedia of Bacterial and Archaeal type strains) (PBE) species (Suárez-Moreno et al., 2012), many of which project (Whitman et al., 2015). These included the rhizobial are plant-associated (e.g., those with plant growth promoting species P. aspalathi (Mavengere et al., 2014) and P. diazotrophica activities, the symbiotic diazotrophs and free-living species with (Sheu et al., 2013), and the soil bacteria P. hospita (Goris et al., diazotrophic, bioremedial and antibiotic activities) (Depoorter 2002), P. phenazinium (Viallard et al., 1998), P. sartisoli (Vanlaere et al., 2016; Estrada-de los Santos et al., 2016). Because of this et al., 2008), P. terricola (Goris et al., 2002), as well as the plant- heterogeneity, new genera [e.g., ‘Caballeronia’ (Gyaneshwar et al., associated diazotrophic species P. caballeronis (Martínez-Aguilar 2011) and ‘Paraburkholderia’ (Sawana et al., 2014)] has been et al., 2013) and P. tropica (Reis et al., 2004). introduced to accommodate most of the PBE species (Oren and Garrity, 2015a,b, 2017), while retaining the pathogens in Burkholderia sensu stricto. Most recently, a third genus, Robbsia MATERIALS AND METHODS was introduced to accommodate the phytopathogen previously referred to as B. andropogonis (Lopes-Santos et al., 2017). Whole-Genome Sequencing of Eight Overall, the taxonomy of Burkholderia sensu lato remains Paraburkholderia Type Strains in significant flux (Estrada-de los Santos et al., 2016). With The eight type strains (P. aspalathi LMG 27731T, P. hospita their review of the group, Estrada-de los Santos et al.(2016) LMG 20598T, P. diazotrophica LMG 206031T, P. phenazinium recognized two monophyletic groups [Groups A and B; A LMG 2247T, P. sartisoli LMG 24000T, P. terricola LMG 20594T, consists of Caballeronia and Paraburkholderia as circumscribed P. tropica LMG 22274T and P. caballeronis LMG 26416T) by Gyaneshwar et al.(2011) and Sawana et al.(2014), respectively, were obtained from the Belgian Coordinated Collections of while Group B includes most of the notable human, animal and Microorganisms (University of Gent, Belgium). Routine growth plant pathogens, as well as the so-called “B. cepacia complex”]. of these bacteria in the laboratory and extraction of high They showed that B. andropogonis (now Robbsia andropogonis) quality genomic DNA were completed as described previously is separated into its own group, and they designated two so- (Steenkamp et al., 2015). Whole genome sequencing was called “Transition Groups” (i.e., 1 and 2; neither were supported performed by the Joint Genome Institute (JGI) following as monophyletic and both contained mainly environmental standard protocols1 and using the Illumina HiSeq-2500 1TB species). Since then, Dobritsa and Samadpour(2016) have platform with an Illumina 300 base pair (bp) insert standard proposed the transfer of species in Transition Group 2 to a shotgun library. new genus. However, to complicate the issue, this new genus All raw sequences were filtered using BBDuk (Bushnell, 2017), was named “Caballeronia” although its proposed usage is not which removes known Illumina artifacts, and PhiX. Reads with synonymous with the one previously proposed by Gyaneshwar more than one “N” or with quality scores (before trimming) et al.(2011) for accommodating all the PBE isolates. averaging less than 8 or reads shorter than 51 bp (after trimming) The proposals to split Burkholderia sensu lato were based were discarded. The remaining reads were mapped to masked almost entirely on evidence from 16S ribosomal RNA (rRNA) versions of human, cat and dog reference sequences using phylogenetic trees with limited and in some cases no statistical BBMap (Bushnell, 2017) and discarded if identity values exceeded support (Gyaneshwar et al., 2011; Dobritsa and Samadpour, 93%. The remaining reads were then assembled into contigs 2016; Eberl and Vandamme, 2016). Even phylogenies based on using Velvet version 1.2.07 (Zerbino and Birney, 2008) (the conventional multilocus sequence analysis (MLSA) using the settings used were velveth: 63 –shortPaired and velvetg: –very combined sequence information for 4–7 genes (Gevers et al., clean yes –exportFiltered yes –min contig lgth 500 –scaffolding 2005) produced phylogenies in which the major groups were no –cov cutoff 10). The Velvet contigs were then used to not supported as monophyletic (Estrada-de los Santos et al., generate 1–3 kbp simulated paired end reads using wgsim 2013). Also, the most comprehensive phylogenetic hypothesis to version 0.3.02 (the settings used were –e 0 –1 100 –2 100 –r date (based on 21 conserved gene sequences) lacked sufficient 0 R 0 –X 0). We then assembled the quality filtered Illumina representation across this diverse assemblage (Sawana et al., reads with the simulated read pairs using Allpaths-LG version 2014). Thus, uncertainties remain regarding the genomic and r46652 (Gnerre and MacCallum, 2011) (the settings used were evolutionary coherence of Burkholderia sensu lato and its PrepareAllpathsInputs:
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