PubMed  Expanded diversity of microbial groups that shape the dissimilatory sulfur cycle. For the Wood-Ljungdahl (WL) pathway, genes encoding for the delta subunit of the archaeal acetyl-CoA decarbonylase/synthase complex (cdhD) and for the bacterial acetyl-CoA synthase (acsB) were more prevalent in the M-vent community, while the genes encoding for the alpha, beta, and epsilon subunits of the archaeal acetyl-CoA decarbonylase/synthase complex (chdA, cdhC, and cdhB, respectively) were present in higher abundances in the L-vent community (Fig. Some live in the hydrogen sulfide-rich waters that flow out of the vent. In the M-vent chimney, narG/H were significantly enriched, with 43% of narG assigned to Alphaproteobacteria (Additional file 1: Figure S1b), while napA/B were more enriched in the active L-vent chimney, with 98% of napA assigned to Campylobacteria and Aquificae (Additional file 1: Figure S1a). Wu Y-W, Simmons BA, Singer SW. MaxBin 2.0: an automated binning algorithm to recover genomes from multiple metagenomic datasets. Environ Microbiol. Since the discovery of the first deep-sea hydrothermal vent (DSHV) near the Galapagos Islands in 1977 [1], more than 700 DSHV fields have been discovered and investigated along mid-oceanic ridges and other tectonically active areas of the ocean [2]. Water-rock reactions at high temperatures generated by subsurface magmatic heating transforms the seawater percolating into the ocean crust into hot, reduced, metal-rich hydrothermal fluids that vent from the seafloor. Moreover, we also retrieved and deciphered 173 high quality MAGs from both chimneys, which provide genomic insights into the metabolic functions and ecological roles of these microbes. Front Microbiol. Previous microbiological investigations have shown that the microbial communities inhabiting active sulfide chimneys are diverse, including Campylobacteria (previously known as Epsilonproteobacteria [14]), Aquificae, Gammaproteobacteria, and some archaeal taxa [15,16,17]. Because we are interested in the chemical composition of fluids accessible to vent communities living within the chimney structures, the composition of M-vent fluids reported in Table 1 are not extrapolated to zero-Mg endmember values. Springer Nature. 2017;15:690–703. The phylogenetic analyses of the 16S rRNA gene showed that the active L-vent chimney was dominated by Campylobacteria (phylum Campylobacterota) (55.4%), including the genera Sulfurovum (20.2%), Nitratifractor (8.6%), Sulfurimonas (8.6%), and Caminibacter (6.3%) (Additional file 2: Table S3). Assessing microbial processes in deep-sea hydrothermal systems by incubation at in situ temperature and pressure. Genome analysis of Thermosulfurimonas dismutans, the first thermophilic sulfur-disproportionating bacterium of the phylum Thermodesulfobacteria. Böhnke S, Sass K, Gonnella G, Diehl A, Kleint C, Bach W, Zitoun R, Koschinsky A, Indenbirken D, Sander SG, et al. Phylogenetic analysis showed that the 4 out of the 6 Nitrospirae MAGs could be assigned to a newly identified “sulfide-mineral” clade, along with 5 additional MAGs either from inactive sulfide chimneys or subseafloor massive sulfides (SMS) [37, 71] (Fig. As a final note on theories of the beginning of life, there is also a possibility that DNA evolved elsewhere, perhaps on Mars, on one of the moons or asteroids further out in our solar system, or even in some other solar system, then come to earth in the form of a meteorite. Differentially shaded tiles represent the completeness of displayed metabolic pathways, including none, partial, incomplete, and complete four levels. We thank the officers, crew, and pilots of the R/V Atlantis and ROV Jason during cruise AT26-10 for their expert help at sea and their outstanding efforts acquiring the samples for this study. Quast C, Pruesse E, Yilmaz P, Gerken J, Schweer T, Yarza P, Peplies J, Glockner FO. HF, hydrothermal fluids; SW, seawater; Methano-, Methanocaldococcus; Nano-, Nanoarchaeum; Campylo-, Campylobacteria; Chlof-, Chloroflexi; Thermo-, Thermodesulfobacteria; FCB, FCB group; Alpha-, Alphaproteobacteria; Gamma-, Gammaproteobacteria; Delta-, Deltaproteobacteria, Nitrosp-, Nitrospirae; PVC, PVC group; Eury-, Euryarchaeota; FeS2, pyrite-like sulfide minerals; CaSO4, anhydrite-like sulfate minerals. Seewald JS, Doherty KW, Hammar TR, Liberatore SP. Nature. 2017;25:92–9. Eddie BJ, Wang Z, Hervey WJ, Leary DH, Malanoski AP, Tender LM, Lin B, Strycharz-Glaven SM: Metatranscriptomics supports the mechanism for biocathode electroautotrophy by “Candidatus Tenderia electrophaga”. Measured concentrations of selected aqueous species and pH in replicate fluid samples from M-vent and L-vent. Coupled RNA-SIP and metatranscriptomics of active chemolithoautotrophic communities at a deep-sea hydrothermal vent. The numbers in the metabolic pathway columns represent the percentage of the microbial taxa encoded the complete pathway (based on quantity of MAGs, e.g. 2011;61:1239–45. In addition, further phylogenetic analyses were carried out for the MAGs assigned to Nitrospirae, Gammaproteobacteria, and Campylobacteria, respectively. Sci Rep. 2016;6:34212. In view of the fact that membrane-bound nitrate reductase encoded by nar is more efficient than the nap-encoded periplasmic nitrate reductase at high nitrate concentrations [95], the higher frequency of nar gene observed in the M-vent possibly reflects the microbial adaption to the increased accessibility of nitrate, implying that the intrusion of seawater plays an important role in the microbial succession after venting ceases. For Archaea, 4 and 8 MAGs were assigned to the phyla Euryarchaeota and Crenarchaeota, representing 4.6% and 2.8%, respectively (Additional file 2: Table S6). This gene encodes an outer membrane cytochrome c, which was demonstrated to mediate iron oxidation in the acidophilic FeOB Acidithiobacillus ferrooxidans and has also been found in all available genomes of neutrophilic FeOB and has been proposed as a candidate genetic marker for FeOB [73, 87, 88]. January 24, 2012. The binning method used here is modified from Wang et al [58]. Genes encoding for the enzymes catalyzing the subsequent steps of denitrification (nirS/K, norB/C, nosZ; Additional file 2: Table S7) were identified in 73% and 47% of the MAGs belonging to the Aquificae and Campylobacteria, respectively (Fig. The napA/B and narG/H genes encoding nitrate reductase are tested individually and not included in the DNRA and denitrification pathway. Support for internal nodes was constructed from 1000 bootstrap replicates, black dots represent those nodes with bootstrap value > 75%, which is direct proportional to their diameter. The phylogenetic tree is based on 37 concatenated ribosomal proteins and collapsed at the genus level. In addition, 50% of the MAGs also contain the gene encoding for the reverse DSR as evidenced by the phylogenetic assignment of the dsrA gene (Additional file 1: Figure S2), indicating the potential for the oxidative DSR pathway for sulfur oxidation. Front Microbiol. 2 and 4). The resulting sam file was sorted and converted to bam using samtools (v1.3.1), and depth of each contig was generated by using the cytoscapeviz script of multi-metagenome project [42]. nov. International Journal of Systematic and Evolutionary Microbiology 2000, 50:2093-2100. Table S8 Sulfur metabolic pathways of Thermodesulfobacteria MAGs recovered. zonation, the successional patterns at hydrothermal vents have also been interpreted in terms of species' responses to changes in the character of hydrothermal vent flux. 4). 2019;10:2296. Since the majority of dsrA/B were assigned to unclassified species, we inferred the taxonomy and catalytic type of dsrA based on their phylogenies. Phylogeny of 173 high-quality MAGs recovered from active L-vent chimney and recently inactive M-vent chimney. rTCA: complete - aclA/B; uncomplete - aclA or aclB. 2015;17:4063–77. After filtering the reduplicate contigs in multiple MAGs, we kept qualified MAGs with completeness ≥ 70% and contamination ≤ 9% based on the evaluation from CheckM with parameter lineage-specific. For the denitrification pathway, the gene encoding for the beta subunit of the nitric oxide reductase (norB) and for the nitrous-oxide reductase (nosZ) were identified in significantly higher abundance in the active L-vent chimney compared to M-vent (Fig. Novel barite chimneys at the Loki’s castle vent field shed light on key factors shaping microbial communities and functions in hydrothermal systems. nov., a heavily flagellated archaeon that adheres to surfaces and forms cell-cell contacts. Prevalent cytochrome c oxidase genes identified in most of MAGs from the M-vent suggest that oxygen is very likely a widespread electron acceptor for microbial communities inhabiting inactive sulfide chimneys (Additional file 2: Table S10). Nat Commun. All retrieved MAGs were annotated by using eggnog-mapper-1.03 in the EggNOG database with e value < 1 × 10−10, which were further cross checked in the Pfam 31.0, TIGRfam 15.0, and custom hmmer databases with e value 10−10. Though more research is necessary to fully understand the regeneration process in the dormant hydrothermal vents, the study provides an additional platform for ecologists to explore how ecosystems recover from natural unbalances and how species adapt to severe changes in temperature, acidity, and chemical composition. 2019;4:595–602. 2012;25:218–33. For example, the Campylobacteria quickly became the dominant community members after 5 days inside the growth chamber of an in situ incubation device [79], sharing high similarity with the taxonomic profile of most investigated mature sulfide chimneys, including L-vent [16,17,18,19, 22, 23, 85, 86]. Numbers in the form represent the completeness of specific pathways for each Nitrospirae genome/MAG, 1 indicates that complete key genes of the pathway were identified in the genomes/MAGs, other else the specific key genes were listed if the pathway is not complete. Nat Microbiol. Methanogenesis/aerobic methane oxidation: complete - mcrA/G/B; uncomplete: two of mcrA/B/G; partial - one of mcrA/G/B. Environ Microbiol. 2018;9:680. Genes encoding for the ATP-citrate lyase (aclA/B), the key enzyme of reductive tricarboxylic acid (rTCA) cycle, were identified in significantly higher abundance (P value < 0.05) in the active L-vent sample compared to M-vent (Fig. Niche partitioning of diverse sulfur-oxidizing bacteria at hydrothermal vents. Albertsen M, Hugenholtz P, Skarshewski A, Nielsen KL, Tyson GW, Nielsen PH. 2015;81:5927–37. First, a pair of MAGs with identical taxonomic classification was combined into one single bin using the “merge” function of CheckM if integrated completeness and contamination would increase ≥ 10% and ≤ 1% respectively. 4 and Additional file 2: Table S6, respectively. 2016;7:950. Environ Microbiol. b Key genes of nitrate reduction, DNRA, denitrification, nitrogen fixation, and nitrification. Nat Rev Microbiol. Jaeschke A, Jorgensen SL, Bernasconi SM, Pedersen RB, Thorseth IH, Fruh-Green GL. SC-1, a FeOB recently isolated from an in situ incubation with pyrrhotite, has been shown to grow autotrophically with iron oxides and sulfur intermediates [30, 90].
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