51
|
Single-cell genomics of a rare environmental alphaproteobacterium provides unique insights into Rickettsiaceae evolution. ISME JOURNAL 2015; 9:2373-85. [PMID: 25848874 DOI: 10.1038/ismej.2015.46] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 02/18/2015] [Accepted: 02/26/2015] [Indexed: 12/21/2022]
Abstract
The bacterial family Rickettsiaceae includes a group of well-known etiological agents of many human and vertebrate diseases, including epidemic typhus-causing pathogen Rickettsia prowazekii. Owing to their medical relevance, rickettsiae have attracted a great deal of attention and their host-pathogen interactions have been thoroughly investigated. All known members display obligate intracellular lifestyles, and the best-studied genera, Rickettsia and Orientia, include species that are hosted by terrestrial arthropods. Their obligate intracellular lifestyle and host adaptation is reflected in the small size of their genomes, a general feature shared with all other families of the Rickettsiales. Yet, despite that the Rickettsiaceae and other Rickettsiales families have been extensively studied for decades, many details of the origin and evolution of their obligate host-association remain elusive. Here we report the discovery and single-cell sequencing of 'Candidatus Arcanobacter lacustris', a rare environmental alphaproteobacterium that was sampled from Damariscotta Lake that represents a deeply rooting sister lineage of the Rickettsiaceae. Intriguingly, phylogenomic and comparative analysis of the partial 'Candidatus Arcanobacter lacustris' genome revealed the presence chemotaxis genes and vertically inherited flagellar genes, a novelty in sequenced Rickettsiaceae, as well as several host-associated features. This finding suggests that the ancestor of the Rickettsiaceae might have had a facultative intracellular lifestyle. Our study underlines the efficacy of single-cell genomics for studying microbial diversity and evolution in general, and for rare microbial cells in particular.
Collapse
|
52
|
Neuenschwander SM, Salcher MM, Pernthaler J. Fluorescence in situ hybridization and sequential catalyzed reporter deposition (2C-FISH) for the flow cytometric sorting of freshwater ultramicrobacteria. Front Microbiol 2015; 6:247. [PMID: 25873914 PMCID: PMC4379941 DOI: 10.3389/fmicb.2015.00247] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 03/13/2015] [Indexed: 12/18/2022] Open
Abstract
Flow cytometric sorting is a powerful tool to physically separate cells within mixed microbial communities. If combined with phylogenetic staining (fluorescence in situ hybridization, FISH) it allows to specifically sort defined genotypic microbial populations from complex natural samples. However, the targeted enrichment of freshwater ultramicrobacteria, such as members of the LD12 clade of Alphaproteobacteria (SAR11-IIIb), is still challenging. Current FISH protocols, even in combination with signal amplification by catalyzed reporter deposition (CARD), are not sufficiently sensitive for the distinction of these bacteria from background noise by flow cytometry, presumably due to their low ribosome content and small cell sizes. We, therefore, modified a CARD based flow sorting protocol with the aim of increasing its sensitivity to a level sufficient for ultramicrobacteria. This was achieved by a second signal amplification step mediated by horseradish peroxidase labeled antibodies targeted to the fluorophores that were previously deposited by CARD-FISH staining. The protocol was tested on samples from an oligo-mesotrophic lake. Ultramicrobacteria affiliated with LD12 Alphaproteobacteria could be successfully sorted to high purity by flow cytometry. The ratios of median fluorescence signal to background ranged around 20, and hybridization rates determined by flow cytometry were comparable to those obtained by fluorescence microscopy. Potential downstream applications of our modified cell staining approach range from the analysis of microdiversity within 16S rRNA-defined populations to that of functional properties, such as the taxon-specific incorporation rates of organic substrates.
Collapse
Affiliation(s)
| | | | - Jakob Pernthaler
- Limnological Station, Institute of Plant Biology, University of ZurichKilchberg, Switzerland
| |
Collapse
|
53
|
Luo H. The use of evolutionary approaches to understand single cell genomes. Front Microbiol 2015; 6:174. [PMID: 25806025 PMCID: PMC4354383 DOI: 10.3389/fmicb.2015.00191] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 02/20/2015] [Indexed: 11/13/2022] Open
Abstract
The vast majority of environmental bacteria and archaea remain uncultivated, yet their genome sequences are rapidly becoming available through single cell sequencing technologies. Reconstructing metabolism is one common way to make use of genome sequences of ecologically important bacteria, but molecular evolutionary analysis is another approach that, while currently underused, can reveal important insights into the function of these uncultivated microbes in nature. Because genome sequences from single cells are often incomplete, metabolic reconstruction based on genome content can be compromised. However, this problem does not necessarily impede the use of phylogenomic and population genomic approaches that are based on patterns of polymorphisms and substitutions at nucleotide and amino acid sites. These approaches explore how various evolutionary forces act to assemble genetic diversity within and between lineages. In this mini-review, I present examples illustrating the benefits of analyzing single cell genomes using evolutionary approaches.
Collapse
Affiliation(s)
- Haiwei Luo
- Simon F. S. Li Marine Science Laboratory, School of Life Sciences, The Chinese University of Hong Kong Hong Kong, China
| |
Collapse
|
54
|
Turlapati SA, Minocha R, Long S, Ramsdell J, Minocha SC. Oligotyping reveals stronger relationship of organic soil bacterial community structure with N-amendments and soil chemistry in comparison to that of mineral soil at Harvard Forest, MA, USA. Front Microbiol 2015; 6:49. [PMID: 25762982 PMCID: PMC4329816 DOI: 10.3389/fmicb.2015.00049] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 01/14/2015] [Indexed: 01/09/2023] Open
Abstract
The impact of chronic nitrogen amendments on bacterial communities was evaluated at Harvard Forest, Petersham, MA, USA. Thirty soil samples (3 treatments × 2 soil horizons × 5 subplots) were collected in 2009 from untreated (control), low nitrogen-amended (LN; 50 kg NH4NO3 ha(-1) yr(-1)) and high nitrogen-amended (HN; 150 kg NH4NO3 ha(-1) yr(-1)) plots. PCR-amplified partial 16S rRNA gene sequences made from soil DNA were subjected to pyrosequencing (Turlapati et al., 2013) and analyses using oligotyping. The parameters M (the minimum count of the most abundant unique sequence in an oligotype) and s (the minimum number of samples in which an oligotype is expected to be present) had to be optimized for forest soils because of high diversity and the presence of rare organisms. Comparative analyses of the pyrosequencing data by oligotyping and operational taxonomic unit clustering tools indicated that the former yields more refined units of taxonomy with sequence similarity of ≥99.5%. Sequences affiliated with four new phyla and 73 genera were identified in the present study as compared to 27 genera reported earlier from the same data (Turlapati et al., 2013). Significant rearrangements in the bacterial community structure were observed with N-amendments revealing the presence of additional genera in N-amended plots with the absence of some that were present in the control plots. Permutational MANOVA analyses indicated significant variation associated with soil horizon and N treatment for a majority of the phyla. In most cases soil horizon partitioned more variation relative to treatment and treatment effects were more evident for the organic (Org) horizon. Mantel test results for Org soil showed significant positive correlations between bacterial communities and most soil parameters including NH4 and NO3. In mineral soil, correlations were seen only with pH, NH4, and NO3. Regardless of the pipeline used, a major hindrance for such a study remains to be the lack of reference databases for forest soils.
Collapse
Affiliation(s)
- Swathi A Turlapati
- Department of Biological Sciences, University of New Hampshire Durham, NH, USA ; Northern Research Station, United States Department of Agriculture Forest Service Durham, NH, USA
| | - Rakesh Minocha
- Northern Research Station, United States Department of Agriculture Forest Service Durham, NH, USA
| | - Stephanie Long
- Northern Research Station, United States Department of Agriculture Forest Service Durham, NH, USA
| | - Jordan Ramsdell
- Hubbard Center for Genome Studies, University of New Hampshire Durham, NH, USA
| | - Subhash C Minocha
- Department of Biological Sciences, University of New Hampshire Durham, NH, USA
| |
Collapse
|
57
|
Spinler JK, Sontakke A, Hollister EB, Venable SF, Oh PL, Balderas MA, Saulnier DMA, Mistretta TA, Devaraj S, Walter J, Versalovic J, Highlander SK. From prediction to function using evolutionary genomics: human-specific ecotypes of Lactobacillus reuteri have diverse probiotic functions. Genome Biol Evol 2014; 6:1772-89. [PMID: 24951561 PMCID: PMC4122935 DOI: 10.1093/gbe/evu137] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The vertebrate gut symbiont Lactobacillus reuteri has diversified into separate clades reflecting host origin. Strains show evidence of host adaptation, but how host–microbe coevolution influences microbial-derived effects on hosts is poorly understood. Emphasizing human-derived strains of L. reuteri, we combined comparative genomic analyses with functional assays to examine variations in host interaction among genetically distinct ecotypes. Within clade II or VI, the genomes of human-derived L. reuteri strains are highly conserved in gene content and at the nucleotide level. Nevertheless, they share only 70–90% of total gene content, indicating differences in functional capacity. Human-associated lineages are distinguished by genes related to bacteriophages, vitamin biosynthesis, antimicrobial production, and immunomodulation. Differential production of reuterin, histamine, and folate by 23 clade II and VI strains was demonstrated. These strains also differed with respect to their ability to modulate human cytokine production (tumor necrosis factor, monocyte chemoattractant protein-1, interleukin [IL]-1β, IL-5, IL-7, IL-12, and IL-13) by myeloid cells. Microarray analysis of representative clade II and clade VI strains revealed global regulation of genes within the reuterin, vitamin B12, folate, and arginine catabolism gene clusters by the AraC family transcriptional regulator, PocR. Thus, human-derived L. reuteri clade II and VI strains are genetically distinct and their differences affect their functional repertoires and probiotic features. These findings highlight the biological impact of microbe:host coevolution and illustrate the functional significance of subspecies differences in the human microbiome. Consideration of host origin and functional differences at the subspecies level may have major impacts on probiotic strain selection and considerations of microbial ecology in mammalian species.
Collapse
Affiliation(s)
- Jennifer K Spinler
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TX
| | - Amrita Sontakke
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TX
| | - Emily B Hollister
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TX
| | - Susan F Venable
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TX
| | - Phaik Lyn Oh
- Department of Food Science and Technology, University of Nebraska, Lincoln
| | - Miriam A Balderas
- Department of Molecular Virology & Microbiology, Baylor College of Medicine, Houston, TX
| | - Delphine M A Saulnier
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TXPresent address: Department of Gastrointestinal Microbiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Toni-Ann Mistretta
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TX
| | - Sridevi Devaraj
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TX
| | - Jens Walter
- Department of Food Science and Technology, University of Nebraska, LincolnPresent address: Departments of Agricultural, Food, & Nutritional Science and Biological Sciences, University of Alberta, Edmonton, AB, Canada
| | - James Versalovic
- Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, Houston, TXDepartment of Pathology & Immunology, Baylor College of Medicine, Houston, TXDepartment of Molecular Virology & Microbiology, Baylor College of Medicine, Houston, TX
| | - Sarah K Highlander
- Department of Molecular Virology & Microbiology, Baylor College of Medicine, Houston, TXHuman Genome Sequencing Center, Baylor College of Medicine, Houston, TXPresent address: Genomic Medicine, J. Craig Venter Institute, La Jolla, CA
| |
Collapse
|