RESUMEN
The Integrated Microbial Genomes & Microbiomes system (IMG/M: https://img.jgi.doe.gov/m/) at the Department of Energy (DOE) Joint Genome Institute (JGI) continues to provide support for users to perform comparative analysis of isolate and single cell genomes, metagenomes, and metatranscriptomes. In addition to datasets produced by the JGI, IMG v.7 also includes datasets imported from public sources such as NCBI Genbank, SRA, and the DOE National Microbiome Data Collaborative (NMDC), or submitted by external users. In the past couple years, we have continued our effort to help the user community by improving the annotation pipeline, upgrading the contents with new reference database versions, and adding new analysis functionalities such as advanced scaffold search, Average Nucleotide Identity (ANI) for high-quality metagenome bins, new cassette search, improved gene neighborhood display, and improvements to metatranscriptome data display and analysis. We also extended the collaboration and integration efforts with other DOE-funded projects such as NMDC and DOE Biology Knowledgebase (KBase).
Asunto(s)
Manejo de Datos , Genómica , Genoma Bacteriano , Programas Informáticos , Genoma Arqueal , Bases de Datos Genéticas , MetagenomaRESUMEN
The ectomycorrhizal (ECM) symbiosis has independently evolved from diverse types of saprotrophic ancestors. In this study, we seek to identify genomic signatures of the transition to the ECM habit within the hyperdiverse Russulaceae. We present comparative analyses of the genomic architecture and the total and secreted gene repertoires of 18 species across the order Russulales, of which 13 are newly sequenced, including a representative of a saprotrophic member of Russulaceae, Gloeopeniophorella convolvens. The genomes of ECM Russulaceae are characterized by a loss of genes for plant cell wall-degrading enzymes (PCWDEs), an expansion of genome size through increased transposable element (TE) content, a reduction in secondary metabolism clusters, and an association of small secreted proteins (SSPs) with TE 'nests', or dense aggregations of TEs. Some PCWDEs have been retained or even expanded, mostly in a species-specific manner. The genome of G. convolvens possesses some characteristics of ECM genomes (e.g. loss of some PCWDEs, TE expansion, reduction in secondary metabolism clusters). Functional specialization in ECM decomposition may drive diversification. Accelerated gene evolution predates the evolution of the ECM habit, indicating that changes in genome architecture and gene content may be necessary to prime the evolutionary switch.
Asunto(s)
Agaricales , Micorrizas , Agaricales/genética , Elementos Transponibles de ADN/genética , Evolución Molecular , Hábitos , Micorrizas/genética , Filogenia , Simbiosis/genéticaRESUMEN
The cyanobacterial phylum encompasses oxygenic photosynthetic prokaryotes of a great breadth of morphologies and ecologies; they play key roles in global carbon and nitrogen cycles. The chloroplasts of all photosynthetic eukaryotes can trace their ancestry to cyanobacteria. Cyanobacteria also attract considerable interest as platforms for "green" biotechnology and biofuels. To explore the molecular basis of their different phenotypes and biochemical capabilities, we sequenced the genomes of 54 phylogenetically and phenotypically diverse cyanobacterial strains. Comparison of cyanobacterial genomes reveals the molecular basis for many aspects of cyanobacterial ecophysiological diversity, as well as the convergence of complex morphologies without the acquisition of novel proteins. This phylum-wide study highlights the benefits of diversity-driven genome sequencing, identifying more than 21,000 cyanobacterial proteins with no detectable similarity to known proteins, and foregrounds the diversity of light-harvesting proteins and gene clusters for secondary metabolite biosynthesis. Additionally, our results provide insight into the distribution of genes of cyanobacterial origin in eukaryotic nuclear genomes. Moreover, this study doubles both the amount and the phylogenetic diversity of cyanobacterial genome sequence data. Given the exponentially growing number of sequenced genomes, this diversity-driven study demonstrates the perspective gained by comparing disparate yet related genomes in a phylum-wide context and the insights that are gained from it.
Asunto(s)
Cianobacterias/clasificación , Cianobacterias/genética , Genoma Bacteriano , Secuencia de Aminoácidos , Proteínas Bacterianas/química , Proteínas Bacterianas/genética , Proteínas Bacterianas/metabolismo , Proteínas de Unión a Clorofila/química , Proteínas de Unión a Clorofila/genética , Proteínas de Unión a Clorofila/metabolismo , Cianobacterias/metabolismo , Evolución Molecular , Variación Genética , Complejos de Proteína Captadores de Luz/química , Complejos de Proteína Captadores de Luz/genética , Complejos de Proteína Captadores de Luz/metabolismo , Modelos Moleculares , Datos de Secuencia Molecular , Familia de Multigenes , Complejo de Proteína del Fotosistema I/química , Complejo de Proteína del Fotosistema I/genética , Complejo de Proteína del Fotosistema I/metabolismo , Filogenia , Plastidios/genética , Homología de Secuencia de AminoácidoRESUMEN
Sequencing of bacterial and archaeal genomes has revolutionized our understanding of the many roles played by microorganisms. There are now nearly 1,000 completed bacterial and archaeal genomes available, most of which were chosen for sequencing on the basis of their physiology. As a result, the perspective provided by the currently available genomes is limited by a highly biased phylogenetic distribution. To explore the value added by choosing microbial genomes for sequencing on the basis of their evolutionary relationships, we have sequenced and analysed the genomes of 56 culturable species of Bacteria and Archaea selected to maximize phylogenetic coverage. Analysis of these genomes demonstrated pronounced benefits (compared to an equivalent set of genomes randomly selected from the existing database) in diverse areas including the reconstruction of phylogenetic history, the discovery of new protein families and biological properties, and the prediction of functions for known genes from other organisms. Our results strongly support the need for systematic 'phylogenomic' efforts to compile a phylogeny-driven 'Genomic Encyclopedia of Bacteria and Archaea' in order to derive maximum knowledge from existing microbial genome data as well as from genome sequences to come.
Asunto(s)
Archaea/clasificación , Archaea/genética , Bacterias/clasificación , Bacterias/genética , Genoma Arqueal/genética , Genoma Bacteriano/genética , Filogenia , Actinas/química , Secuencia de Aminoácidos , Proteínas Bacterianas/química , Biodiversidad , Bases de Datos Genéticas , Genes de ARNr/genética , Modelos Moleculares , Datos de Secuencia Molecular , Estructura Terciaria de Proteína , Alineación de SecuenciaRESUMEN
Mixia osmundae (Basidiomycota, Pucciniomycotina) represents a monotypic class containing an unusual fern pathogen with incompletely understood biology. We sequenced and analyzed the genome of M. osmundae, focusing on genes that may provide some insight into its mode of pathogenicity and reproductive biology. Mixia osmundae has the smallest plant pathogenic basidiomycete genome sequenced to date, at 13.6 Mb, with very few repeats, high gene density, and relatively few significant gene family gains. The genome shows that the yeast state of M. osmundae is haploid and the lack of segregation of mating genes suggests that the spores produced on Osmunda spp. fronds are probably asexual. However, our finding of a complete complement of mating and meiosis genes suggests the capacity to undergo sexual reproduction. Analyses of carbohydrate active enzymes suggest that this fungus is a biotroph with the ability to break down several plant cell wall components. Analyses of publicly available sequence data show that other Mixia members may exist on other plant hosts and with a broader distribution than previously known.
Asunto(s)
Basidiomycota/genética , ADN de Hongos/análisis , Helechos/microbiología , Genes Fúngicos , Genoma Fúngico , Enfermedades de las Plantas/microbiología , Basidiomycota/patogenicidad , Metabolismo de los Hidratos de Carbono , Pared Celular , Haploidia , Meiosis , Reproducción , Reproducción Asexuada , Esporas Fúngicas , LevadurasRESUMEN
Historically neglected by microbial ecologists, soil viruses are now thought to be critical to global biogeochemical cycles. However, our understanding of their global distribution, activities and interactions with the soil microbiome remains limited. Here we present the Global Soil Virus Atlas, a comprehensive dataset compiled from 2,953 previously sequenced soil metagenomes and composed of 616,935 uncultivated viral genomes and 38,508 unique viral operational taxonomic units. Rarefaction curves from the Global Soil Virus Atlas indicate that most soil viral diversity remains unexplored, further underscored by high spatial turnover and low rates of shared viral operational taxonomic units across samples. By examining genes associated with biogeochemical functions, we also demonstrate the viral potential to impact soil carbon and nutrient cycling. This study represents an extensive characterization of soil viral diversity and provides a foundation for developing testable hypotheses regarding the role of the virosphere in the soil microbiome and global biogeochemistry.
Asunto(s)
Biodiversidad , Genoma Viral , Metagenoma , Microbiota , Microbiología del Suelo , Suelo , Virus , Virus/genética , Virus/clasificación , Virus/aislamiento & purificación , Suelo/química , Genoma Viral/genética , Microbiota/genética , Carbono/metabolismo , Metagenómica , Filogenia , Viroma/genética , Bacterias/genética , Bacterias/clasificación , Bacterias/aislamiento & purificaciónRESUMEN
The impacts of microsporidia on host individuals are frequently subtle and can be context dependent. A key example of the latter comes from a recently discovered microsporidian symbiont of Daphnia, the net impact of which was found to shift from negative to positive based on environmental context. Given this, we hypothesized low baseline virulence of the microsporidian; here, we investigated the impact of infection on hosts in controlled conditions and the absence of other stressors. We also investigated its phylogenetic position, ecology, and host range. The genetic data indicate that the symbiont is Ordospora pajunii, a newly described microsporidian parasite of Daphnia. We show that O. pajunii infection damages the gut, causing infected epithelial cells to lose microvilli and then rupture. The prevalence of this microsporidian could be high (up to 100% in the lab and 77% of adults in the field). Its overall virulence was low in most cases, but some genotypes suffered reduced survival and/or reproduction. Susceptibility and virulence were strongly host-genotype dependent. We found that North American O. pajunii were able to infect multiple Daphnia species, including the European species Daphnia longispina, as well as Ceriodaphnia spp. Given the low, often undetectable virulence of this microsporidian and potentially far-reaching consequences of infections for the host when interacting with other pathogens or food, this Daphnia-O. pajunii symbiosis emerges as a valuable system for studying the mechanisms of context-dependent shifts between mutualism and parasitism, as well as for understanding how symbionts might alter host interactions with resources. IMPORTANCE: The net outcome of symbiosis depends on the costs and benefits to each partner. Those can be context dependent, driving the potential for an interaction to change between parasitism and mutualism. Understanding the baseline fitness impact in an interaction can help us understand those shifts; for an organism that is generally parasitic, it should be easier for it to become a mutualist if its baseline virulence is relatively low. Recently, a microsporidian was found to become beneficial to its Daphnia hosts in certain ecological contexts, but little was known about the symbiont (including its species identity). Here, we identify it as the microsporidium Ordospora pajunii. Despite the parasitic nature of microsporidia, we found O. pajunii to be, at most, mildly virulent; this helps explain why it can shift toward mutualism in certain ecological contexts and helps establish O. pajunii is a valuable model for investigating shifts along the mutualism-parasitism continuum.
Asunto(s)
Daphnia , Especificidad del Huésped , Filogenia , Simbiosis , Animales , Daphnia/microbiología , Virulencia , Microsporidios/genética , Microsporidios/patogenicidad , Microsporidios/fisiología , Microsporidios/clasificación , Microsporidia no Clasificados/genética , Microsporidia no Clasificados/patogenicidad , Microsporidia no Clasificados/clasificación , Microsporidia no Clasificados/fisiologíaRESUMEN
Aspergillus terreus has attracted interest due to its application in industrial biotechnology, particularly for the production of itaconic acid and bioactive secondary metabolites. As related species also seem to possess a prosperous secondary metabolism, they are of high interest for genome mining and exploitation. Here, we present draft genome sequences for six species from Aspergillus section Terrei and one species from Aspergillus section Nidulantes. Whole-genome phylogeny confirmed that section Terrei is monophyletic. Genome analyses identified between 70 and 108 key secondary metabolism genes in each of the genomes of section Terrei, the highest rate found in the genus Aspergillus so far. The respective enzymes fall into 167 distinct families with most of them corresponding to potentially unique compounds or compound families. Moreover, 53% of the families were only found in a single species, which supports the suitability of species from section Terrei for further genome mining. Intriguingly, this analysis, combined with heterologous gene expression and metabolite identification, suggested that species from section Terrei use a strategy for UV protection different to other species from the genus Aspergillus. Section Terrei contains a complete plant polysaccharide degrading potential and an even higher cellulolytic potential than other Aspergilli, possibly facilitating additional applications for these species in biotechnology.
RESUMEN
Rahnella aquatilis CIP 78.65 is a gammaproteobacterium isolated from a drinking water source in Lille, France. Here we report the complete genome sequence of Rahnella aquatilis CIP 78.65, the type strain of R. aquatilis.
Asunto(s)
Agua Potable/microbiología , Genoma Bacteriano , Rahnella/genética , Secuencia de Bases , Francia , Datos de Secuencia Molecular , Rahnella/clasificación , Rahnella/aislamiento & purificaciónRESUMEN
Rahnella sp. strain Y9602 is a gammaproteobacterium isolated from contaminated subsurface soils that is capable of promoting uranium phosphate mineralization as a result of constitutive phosphatase activity. Here we report the first complete genome sequence of an isolate belonging to the genus Rahnella.
Asunto(s)
Genoma Bacteriano , Metales/química , Radioisótopos/química , Rahnella/genética , Microbiología del Suelo , Secuencia de Bases , Datos de Secuencia Molecular , Rahnella/clasificación , Contaminantes del Suelo/químicaRESUMEN
We announce the availability of a high-quality draft of the genome sequence of Amycolatopsis sp. strain 39116, one of few bacterial species that are known to consume the lignin component of plant biomass. This genome sequence will further ongoing efforts to use microorganisms for the conversion of plant biomass into fuels and high-value chemicals.
Asunto(s)
Actinobacteria/clasificación , Actinobacteria/genética , Biomasa , Genoma Bacteriano , Plantas , Actinobacteria/metabolismo , Biodegradación Ambiental , Cromosomas Bacterianos , ADN Bacteriano/genética , Regulación Bacteriana de la Expresión Génica , Datos de Secuencia MolecularRESUMEN
Microbial communities in the termite hindgut are essential for degrading plant material. We present the high-quality draft genome sequence of the Opitutaceae bacterium strain TAV1, the first member of the phylum Verrucomicrobia to be isolated from wood-feeding termites. The genomic analysis reveals genes coding for lignocellulosic degradation and nitrogen fixation.
Asunto(s)
Genoma Bacteriano , Isópteros/microbiología , Simbiosis/fisiología , Verrucomicrobia/genética , Animales , Proteínas Bacterianas/genética , Proteínas Bacterianas/metabolismo , Regulación Bacteriana de la Expresión Génica/fisiología , Datos de Secuencia MolecularRESUMEN
The complete and assembled genome sequences were determined for six strains of the alphaproteobacterial genus Methylobacterium, chosen for their key adaptations to different plant-associated niches and environmental constraints.
Asunto(s)
Genoma Bacteriano , Methylobacterium/genética , Secuencia de Bases , Mapeo Cromosómico , ADN Bacteriano/genética , Methylobacterium/clasificación , Datos de Secuencia Molecular , Análisis de Secuencia de ADNRESUMEN
The genomes of three representatives of the family Methylophilaceae, Methylotenera mobilis JLW8, Methylotenera versatilis 301, and Methylovorus glucosetrophus SIP3-4, all isolated from a single study site, Lake Washington in Seattle, WA, were completely sequenced. These were compared to each other and to the previously published genomes of Methylobacillus flagellatus KT and an unclassified Methylophilales strain, HTCC2181. Comparative analysis revealed that the core genome of Methylophilaceae may be as small as approximately 600 genes, while the pangenome may be as large as approximately 6,000 genes. Significant divergence between the genomes in terms of both gene content and gene and protein conservation was uncovered, including the varied presence of certain genes involved in methylotrophy. Overall, our data demonstrate that metabolic potentials can vary significantly between different species of Methylophilaceae, including organisms inhabiting the very same environment. These data suggest that genetic divergence among the members of this family may be responsible for their specialized and nonredundant functions in C1 cycling, which in turn suggests means for their successful coexistence in their specific ecological niches.
Asunto(s)
Evolución Molecular , Genoma Bacteriano , Methylophilaceae/genética , Methylophilaceae/metabolismo , Agua Dulce/microbiología , Metanol/metabolismo , Methylophilaceae/clasificación , Methylophilaceae/aislamiento & purificación , Datos de Secuencia MolecularRESUMEN
The genome of the anaerobic halophilic alkalithermophile Natranaerobius thermophilus consists of one 3,165,557-bp chromosome and two plasmids (17,207 bp and 8,689 bp). The present study is the first to report the completely sequenced genome of an anaerobic polyextremophile and genes associated with roles in regulation of intracellular osmotic pressure, pH homeostasis, and growth at elevated temperatures.
Asunto(s)
Álcalis/metabolismo , Bacterias/genética , Bacterias/aislamiento & purificación , Genoma Bacteriano , Sedimentos Geológicos/microbiología , Cloruro de Sodio/metabolismo , Anaerobiosis , Bacterias/metabolismo , Secuencia de Bases , Datos de Secuencia MolecularRESUMEN
Pseudonocardia dioxanivorans CB1190 is the first bacterium reported to be capable of growth on the environmental contaminant 1,4-dioxane and the first member of the genus Pseudonocardia for which there is an annotated genome sequence. Preliminary analysis of the genome (chromosome and three plasmids) indicates that strain CB1190 possesses several multicomponent monooxygenases that could be involved in the aerobic degradation of 1,4-dioxane and other environmental contaminants.
Asunto(s)
Actinomycetales/clasificación , Actinomycetales/genética , Actinomycetales/metabolismo , Dioxanos/metabolismo , Genoma Bacteriano , Biodegradación Ambiental , ADN Bacteriano/genética , Oxigenasas de Función Mixta/metabolismo , Datos de Secuencia Molecular , Plásmidos , Análisis de Secuencia de ADN/métodosRESUMEN
Zymomonas mobilis is an alphaproteobacterium studied for bioethanol production. Different strains of this organism have been hitherto sequenced; they all belong to the Z. mobilis subsp. mobilis taxon. Here we report the finished and annotated genome sequence of strain ATCC 29192, a cider-spoiling agent isolated in the United Kingdom. ATCC 29192 is the lectotype of the second-best-characterized subspecies of Z. mobilis, Z. mobilis subsp. pomaceae. The nucleotide sequence of ATCC 29192 deviates from that of Z. mobilis subsp. mobilis representatives, which justifies its distinct taxonomic positioning and proves particularly useful for comparative and functional genomic analyses.
Asunto(s)
ADN Bacteriano/química , ADN Bacteriano/genética , Genoma Bacteriano , Análisis de Secuencia de ADN , Zymomonas/genética , Etanol/metabolismo , Microbiología de Alimentos , Datos de Secuencia Molecular , Reino Unido , Zymomonas/aislamiento & purificación , Zymomonas/metabolismoRESUMEN
Glaciecola sp. strain 4H-3-7+YE-5 was isolated from subseafloor sediments at Suruga Bay in Japan and is capable of efficiently hydrolyzing cellulose and xylan. The complete genome sequence of Glaciecola sp. 4H-3-7+YE-5 revealed several genes encoding putatively novel glycoside hydrolases, offering a high potential for plant biomass degradation.
Asunto(s)
Alteromonadaceae/genética , Alteromonadaceae/aislamiento & purificación , Celulosa/metabolismo , Genoma Bacteriano , Xilanos/metabolismo , Alteromonadaceae/metabolismo , Biodegradación Ambiental , Sedimentos Geológicos/microbiología , Glicósido Hidrolasas/genética , Glicósido Hidrolasas/metabolismo , Hidrolasas/genética , Japón , Datos de Secuencia MolecularRESUMEN
Desulfovibrio africanus strain Walvis Bay is an anaerobic sulfate-reducing bacterium capable of producing methylmercury (MeHg), a potent human neurotoxin. The mechanism of methylation by this and other organisms is unknown. We present the 4.2-Mb genome sequence to provide further insight into microbial mercury methylation and sulfate-reducing bacteria.
Asunto(s)
Desulfovibrio africanus/genética , Genoma Bacteriano , Sedimentos Geológicos/microbiología , Compuestos de Metilmercurio/metabolismo , Secuencia de Bases , Desulfovibrio africanus/aislamiento & purificación , Desulfovibrio africanus/metabolismo , Metilación , Datos de Secuencia Molecular , NamibiaRESUMEN
Desulfovibrio alaskensis G20 (formerly Desulfovibrio desulfuricans G20) is a Gram-negative mesophilic sulfate-reducing bacterium (SRB), known to corrode ferrous metals and to reduce toxic radionuclides and metals such as uranium and chromium to sparingly soluble and less toxic forms. We present the 3.7-Mb genome sequence to provide insights into its physiology.