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Puzzling out the ecological niche construction for nitrogen fixers in a coastal upwelling system. 探讨了海岸上升流系统中固氮生物的生态位构建。
IF 5.1
ISME communications Pub Date : 2025-02-04 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf018
Marcos Fontela, Daniel Fernández-Román, Esperanza Broullón, Hanna Farnelid, Ana Fernández-Carrera, Emilio Marañón, Sandra Martínez-García, Tamara Rodríguez-Ramos, Marta M Varela, Beatriz Mouriño-Carballido
{"title":"Puzzling out the ecological niche construction for nitrogen fixers in a coastal upwelling system.","authors":"Marcos Fontela, Daniel Fernández-Román, Esperanza Broullón, Hanna Farnelid, Ana Fernández-Carrera, Emilio Marañón, Sandra Martínez-García, Tamara Rodríguez-Ramos, Marta M Varela, Beatriz Mouriño-Carballido","doi":"10.1093/ismeco/ycaf018","DOIUrl":"10.1093/ismeco/ycaf018","url":null,"abstract":"<p><p>Diazotrophs are a diverse group of microorganisms that can fertilize the ocean through biological nitrogen fixation (BNF). Due to the high energetic cost of this process, diazotrophy in nitrogen-replete regions remains enigmatic. We use multidisciplinary observations to propose a novel framework for the ecological niche construction of nitrogen fixers in the upwelling region off NW Iberia-one of the most productive coastal regions in Europe-characterized by weak and intermittent wind-driven upwelling and the presence of bays. The main diazotroph detected (UCYN-A2) was more abundant and active during summer and early autumn, coinciding with relatively high temperatures (>16°C), low nitrogen:phosphorus ratios (N:P < 7.2), and a large contribution of ammonium (>75%) to the total dissolved inorganic nitrogen available. Furthermore, nutrient amendment experiments showed that BNF is detectable when phytoplankton biomass and productivity are nitrogen limited. Seasonally recurrent biogeochemical processes driven by hydrography create an ecological niche for nitrogen fixers in this system. During the spring-summer upwelling, nondiazotroph autotrophs consume nitrate and produce organic matter inside the bays. Thereafter, the combined effect of intense remineralization on the shelf and sustained positive circulation within the bays in late summer-early autumn, conveys enhanced ammonium content and excess phosphate into the warm surface layer. The low N:P ratio confers a competitive advantage to diazotrophs since they are not restricted by nitrogen supply. The new nitrogen supply mediated by BNF could extend the productivity period, and may be a key reason why upwelling bays are more productive than upwelled offshore waters.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf018"},"PeriodicalIF":5.1,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11931620/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143702474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamics of bacterial growth, and life-history tradeoffs, explain differences in soil carbon cycling due to land-use. 细菌生长的动态和生活史的权衡解释了土地利用导致的土壤碳循环的差异。
IF 5.1
ISME communications Pub Date : 2025-01-30 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf014
Cassandra J Wattenburger, Evangeline Wang, Daniel H Buckley
{"title":"Dynamics of bacterial growth, and life-history tradeoffs, explain differences in soil carbon cycling due to land-use.","authors":"Cassandra J Wattenburger, Evangeline Wang, Daniel H Buckley","doi":"10.1093/ismeco/ycaf014","DOIUrl":"10.1093/ismeco/ycaf014","url":null,"abstract":"<p><p>Soil contains a considerable fraction of Earth's organic carbon. Bacterial growth and mortality drive the microbial carbon pump, influencing carbon use efficiency and necromass production, key determinants for organic carbon persistence in soils. However, bacterial growth dynamics in soil are poorly characterized. We used an internal standard approach to normalize 16S ribosomal RNA gene sequencing data allowing us to quantify growth dynamics for 30 days following plant litter input to soil. We show that clustering taxa into three groups optimized variation of bacterial growth parameters in situ. These three clusters differed significantly with respect to their lag time, growth rate, growth duration, and change in abundance due to growth (ΔN<sub>g</sub>) and mortality (ΔN<sub>d</sub>), matching predictions of Grime's CSR life-history framework. In addition, we show a striking relationship between ΔN<sub>g</sub> and ΔN<sub>d</sub>, which reveals that growth in soil is tightly coupled to death. This result suggests a fitness paradox whereby some bacteria can optimize fitness in soil by minimizing mortality rather than maximizing growth. We hypothesized that land-use constrains microbial growth dynamics by favoring different life-history strategies and that these constraints control carbon mineralization. We show that life-history groups vary in prevalence with respect to land-use, and that bacterial growth dynamics correlated with carbon mineralization rate and net growth efficiency. Meadow soil supported more bacterial growth, greater mortality, and higher growth efficiency than agricultural soils, pointing toward more efficient conversion of plant litter into microbial necromass, which should promote long-term C stabilization.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf014"},"PeriodicalIF":5.1,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11844245/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143484834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unraveling the influence of microbial necromass on subsurface microbiomes: metabolite utilization and community dynamics. 揭示微生物坏死团对地下微生物组的影响:代谢物利用和群落动态。
IF 5.1
ISME communications Pub Date : 2025-01-29 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf006
Brianna K Finley, Brandon C Enalls, Markus de Raad, Mariam Al Said, Mingfei Chen, Dominique C Joyner, Terry C Hazen, Trent R Northen, Romy Chakraborty
{"title":"Unraveling the influence of microbial necromass on subsurface microbiomes: metabolite utilization and community dynamics.","authors":"Brianna K Finley, Brandon C Enalls, Markus de Raad, Mariam Al Said, Mingfei Chen, Dominique C Joyner, Terry C Hazen, Trent R Northen, Romy Chakraborty","doi":"10.1093/ismeco/ycaf006","DOIUrl":"10.1093/ismeco/ycaf006","url":null,"abstract":"<p><p>The role of microbial necromass (nonliving microbial biomass), a significant component of belowground organic carbon, in nutrient cycling and its impact on the dynamics of microbial communities in subsurface systems remains poorly understood. It is currently unclear whether necromass metabolites from various microbes are different, whether certain groups of metabolites are preferentially utilized over others, or whether different microbial species respond to various necromass metabolites. In this study, we aimed to fill these knowledge gaps by designing enrichments with necromass as the sole nutrient source for subsurface microbial communities. We used the soluble fraction of necromass from bacterial isolates belonging to <i>Arthrobacter</i>, <i>Agrobacterium</i>, and <i>Pseudomonas</i> genera, and our results indicate that metabolite composition of necromass varied slightly across different strains but generally included amino acids, organic acids, and nucleic acid constituents. <i>Arthrobacter</i>-derived necromass appeared more recalcitrant. Necromass metabolites enriched diverse microbial genera, particularly <i>Massilia</i> sp. responded quickly regardless of the necromass source. Despite differences in necromass utilization, microbial community composition converged rapidly over time across the three different necromass amendments. Uracil, xanthine, valine, and phosphate-containing isomers were generally depleted over time, indicating microbial assimilation for maintenance and growth. However, numerous easily assimilable metabolites were not significantly depleted, suggesting efficient necromass recycling and the potential for necromass stabilization in systems. This study highlights the dynamic interactions between microbial necromass metabolites and subsurface microbial communities, revealing both selective utilization and rapid community and necromass convergence regardless of the necromass source.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf006"},"PeriodicalIF":5.1,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11843093/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143484789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microbial community dynamics in the soil-root continuum are linked with plant species turnover during secondary succession. 土壤-根连续统微生物群落动态与次生演替过程中植物物种更替有关。
IF 5.1
ISME communications Pub Date : 2025-01-29 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf012
Weiming Yan, Mengting Maggie Yuan, Shi Wang, Patrick O Sorensen, Tao Wen, Yuting Xu, Honglei Wang, Shuo Jiao, Ji Chen, Zhouping Shangguan, Lei Deng, Ziyan Li, Yangquanwei Zhong
{"title":"Microbial community dynamics in the soil-root continuum are linked with plant species turnover during secondary succession.","authors":"Weiming Yan, Mengting Maggie Yuan, Shi Wang, Patrick O Sorensen, Tao Wen, Yuting Xu, Honglei Wang, Shuo Jiao, Ji Chen, Zhouping Shangguan, Lei Deng, Ziyan Li, Yangquanwei Zhong","doi":"10.1093/ismeco/ycaf012","DOIUrl":"10.1093/ismeco/ycaf012","url":null,"abstract":"<p><p>Grazing exclusion and land abandonment are commonly adopted to restore degraded ecosystems in semiarid and arid regions worldwide. However, the temporal variation in the soil- versus root-associated microbiome over plant species turnover during secondary succession has rarely been quantified. Using the chronosequence restored from fenced grassland and abandoned farmlands on the Loess Plateau of China, we characterized the dynamics of the soil- and root-associated microbiome of host plant with different dominance statuses during secondary succession from 0 to 40 years. Our results revealed that the root microhabitat, the host plant and their interactions were the main contributors to the bacterial community shift (R<sup>2</sup> = 15.5%, 8.1%, and 22.3%, respectively), and plant interspecies replacement had a greater effect on the shift in the root-associated microbial community than intraspecies replacement did during succession. The root-associated bacterial community of pioneer plants was particularly responsive to succession, especially the endosphere community. Endosphere microbial diversity was positively correlated with host plant coverage change, and the diversity and abundance of taxon recruitment into the endosphere of pioneer plants from the surrounding environment decreased as succession progressed. The community assembly processes also indicated that the endosphere microbiota are strongly selected in younger host plants, whereas stochastic processes dominate in aged host plants. Our study provides evidence of the unique response of the root-associated microbiome to the replacement of plant species during secondary succession, and the function of endosphere microbes should be considered when studying plant-microbe feedback.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf012"},"PeriodicalIF":5.1,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11932647/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143702470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Motility genes are associated with the occurrence of Drosophila melanogaster-associated gut microbes. 运动基因与黑腹果蝇相关肠道微生物的发生有关。
IF 5.1
ISME communications Pub Date : 2025-01-27 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf013
Rishi Bhandari, Caleb J Robbins, Arinder K Arora, John M Chaston, David S Kang
{"title":"Motility genes are associated with the occurrence of <i>Drosophila melanogaster</i>-associated gut microbes.","authors":"Rishi Bhandari, Caleb J Robbins, Arinder K Arora, John M Chaston, David S Kang","doi":"10.1093/ismeco/ycaf013","DOIUrl":"10.1093/ismeco/ycaf013","url":null,"abstract":"<p><p>Recent work highlighted the role of motility genes in dispersing fly-associated microbes and their spread between hosts. We investigated whether bacterial genes encoding motility are associated with the occurrence of bacteria above passive dispersal levels in the gut of wild <i>Drosophila melanogaster</i>. We revisited 16S amplicon and shotgun metagenome data of wild flies and correlated four genera of bacteria (<i>Commensalibacter</i>, <i>Gluconobacter</i>, <i>Lactobacillus</i>, and <i>Tatumella</i>) with motility genes. We plotted the microbes against neutral models of ecological drift and passive dispersal. Microbes with positive correlations to motility were exclusively found at or above neutral model predictions, suggesting motility genes are crucial for fly microbiota spread and colonization. This information is crucial for understanding how specific gene functions contribute to microbial community dispersal and colonization within the fly host. Moreover, this study's findings serve as a proof of concept for using the neutral model to predict microbial functions essential for survival and dissemination in diverse hosts.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf013"},"PeriodicalIF":5.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11831033/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Asymmetric metabolic adaptations undermine stability in microbial syntrophy. 不对称的代谢适应破坏了微生物合胞的稳定性。
IF 5.1
ISME communications Pub Date : 2025-01-25 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf011
Nan Ye, Zhi-Chun Yang, Zhuang-Dong Bai
{"title":"Asymmetric metabolic adaptations undermine stability in microbial syntrophy.","authors":"Nan Ye, Zhi-Chun Yang, Zhuang-Dong Bai","doi":"10.1093/ismeco/ycaf011","DOIUrl":"10.1093/ismeco/ycaf011","url":null,"abstract":"<p><p>Syntrophic interaction, driven by metabolite exchange, is widespread within microbial communities. However, co-inoculation of most auxotrophic microorganisms often fails to establish a stable metabolite exchange relationship. Here, we engineered two auxotrophic <i>Escherichia coli</i> strains, each dependent on the other for essential amino acid production, to investigate the dynamics of syntrophic relationships. Through invasion-from-rare experiments, we observed the rapid formation of syntrophic consortia stabilized by frequency-dependent selection, converging to a 2:1 ratio of lysine-to-arginine auxotrophs. However, laboratory evolution over 25 days revealed that syntrophic interactions were evolutionarily unstable, with cocultures collapsing as ΔL cells dominated the population. Reduced fitness in cocultures was driven by the emergence of a \"selfish\" ΔL phenotype, characterized by decreased arginine production and exploitation of lysine produced by ΔA cells. Dynamic metabolic assays revealed that metabolite production and utilization patterns strongly influenced the fitness of each strain. ΔL cells displayed metabolic plasticity, adjusting lysine utilization in response to lysine availability, which enabled them to outcompete ΔA cells. In contrast, ΔA cells lacked similar plasticity, resulting in their negative selection. These findings demonstrate that asymmetric metabolic responses and the emergence of selfish phenotypes destabilize syntrophic relationships. Our work underscores the importance of balanced metabolic exchanges for developing sustainable synthetic microbial consortia and offers insights into the evolutionary dynamics of microbial cooperation.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf011"},"PeriodicalIF":5.1,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11815887/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143412014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High ectomycorrhizal relative abundance during winter at the treeline. 林木线冬季外生菌根相对丰度较高。
IF 5.1
ISME communications Pub Date : 2025-01-25 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf010
Luis A Saona, Christian I Oporto, Pablo Villarreal, Kamila Urbina, Cristian Correa, Julian F Quintero-Galvis, Paulo Moreno-Meynard, Frida I Piper, Juliana A Vianna, Roberto F Nespolo, Francisco A Cubillos
{"title":"High ectomycorrhizal relative abundance during winter at the treeline.","authors":"Luis A Saona, Christian I Oporto, Pablo Villarreal, Kamila Urbina, Cristian Correa, Julian F Quintero-Galvis, Paulo Moreno-Meynard, Frida I Piper, Juliana A Vianna, Roberto F Nespolo, Francisco A Cubillos","doi":"10.1093/ismeco/ycaf010","DOIUrl":"10.1093/ismeco/ycaf010","url":null,"abstract":"<p><p>The rhizosphere is the soil region around plant roots hosting a diverse microbial community, influencing nutrient availability and how plants react to extreme conditions. However, our understanding of the fungi biodiversity and the impact of environmental variations on this biodiversity is still in its infancy. Our study investigates fungal communities' diversity and functional traits in the rhizosphere of <i>Nothofagus pumilio,</i> one of the few winters deciduous treeline species in the world, forming the treeline in southern South America. At four distinct locations covering 10° latitude, we collected soil samples at treeline and 200 m below over four seasons during a single year. We employed ITS metabarcoding to elucidate fungal community structures. Our results reveal that fungal diversity was mainly determined by latitudinal variation, with higher levels during warmer seasons and lower altitudes. Interestingly, we found a marked dominance of ectomycorrhizal fungi at the treeline, particularly during the winter. In contrast, saprotrophic fungi were more abundant at lower altitudes, particularly during the warmer spring and summer seasons. These findings highlight the temporal and spatial dynamics of rhizospheric fungal communities and their potential roles in ecological processes, emphasizing the value of these communities as indicators of environmental change in high-elevation forests.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf010"},"PeriodicalIF":5.1,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11815889/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143412023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Metagenomic analyses of gut microbiome composition and function with age in a wild bird; little change, except increased transposase gene abundance. 野生鸟类肠道菌群组成及功能随年龄变化的宏基因组分析除了转座酶基因丰度增加外,变化不大。
IF 5.1
ISME communications Pub Date : 2025-01-23 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf008
Chuen Zhang Lee, Sarah F Worsley, Charli S Davies, Ece Silan, Terry Burke, Jan Komdeur, Falk Hildebrand, Hannah L Dugdale, David S Richardson
{"title":"Metagenomic analyses of gut microbiome composition and function with age in a wild bird; little change, except increased transposase gene abundance.","authors":"Chuen Zhang Lee, Sarah F Worsley, Charli S Davies, Ece Silan, Terry Burke, Jan Komdeur, Falk Hildebrand, Hannah L Dugdale, David S Richardson","doi":"10.1093/ismeco/ycaf008","DOIUrl":"10.1093/ismeco/ycaf008","url":null,"abstract":"<p><p>Studies on wild animals, mostly undertaken using 16S metabarcoding, have yielded ambiguous evidence regarding changes in the gut microbiome (GM) with age and senescence. Furthermore, variation in GM function has rarely been studied in such wild populations, despite GM metabolic characteristics potentially being associated with host senescent declines. Here, we used 7 years of repeated sampling of individuals and shotgun metagenomic sequencing to investigate taxonomic and functional changes in the GM of Seychelles warblers (<i>Acrocephalus sechellensis</i>) with age. Our results suggest that taxonomic GM species richness declines with age and in the terminal year, with this terminal decline occurring consistently across all ages. Taxonomic and functional GM composition also shifted with host age. However, the changes we identified occurred linearly with age (or even mainly during early years prior to the onset of senescence in this species) with little evidence of accelerated change in later life or during their terminal year. Therefore, the results suggest that changes in the GM with age are not linked to senescence. Interestingly, we found a significant increase in the abundance of a group of transposase genes with age, which may accumulate passively or due to increased transposition induced as a result of stressors that arise with age. These findings reveal taxonomic and functional GM changes with age, but not senescence, in a wild vertebrate and provide a blueprint for future wild functional GM studies linked to age and senescence.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf008"},"PeriodicalIF":5.1,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11833318/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Shotgun metagenomics reveals the flexibility and diversity of Arctic marine microbiomes. 鸟枪宏基因组学揭示了北极海洋微生物组的灵活性和多样性。
IF 5.1
ISME communications Pub Date : 2025-01-21 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf007
Nastasia J Freyria, Thais C de Oliveira, Arnaud Meng, Eric Pelletier, Connie Lovejoy
{"title":"Shotgun metagenomics reveals the flexibility and diversity of Arctic marine microbiomes.","authors":"Nastasia J Freyria, Thais C de Oliveira, Arnaud Meng, Eric Pelletier, Connie Lovejoy","doi":"10.1093/ismeco/ycaf007","DOIUrl":"10.1093/ismeco/ycaf007","url":null,"abstract":"<p><p>Polar oceanographic regions are exposed to rapid changes in temperature, salinity, and light fields that determine microbial species distributions, but resilience to an increasingly unstable climate is unknown. To unravel microbial genomic potential of the Northern Baffin Bay's polynya, we constructed eight metagenomes from the same latitude but targeting two sides of <i>Pikialasorsuaq</i> (The North Water) that differ by current systems, stratification, and temperature regimes. Samples from the surface and subsurface chlorophyll maximum (SCM) of both sides were collected 13 months apart. Details of metabolic pathways were determined for 18 bacteria and 10 microbial eukaryote metagenome-assembled genomes (MAGs). The microbial eukaryotic MAGs were associated with the dominant green algae in the Mamiellales and diatoms in the Mediophyceae, which tended to respectively dominate the eastern and western sides of <i>Pikialasorsuaq</i>. We show that microbial community taxonomic and functional signatures were ca. 80% similar at the latitude sampled with only 20% of genes associated with local conditions. From the metagenomes we found genes involved in osmotic regulation, antifreeze proteins, and photosystem protection, with hydrocarbon biodegradation and methane oxidation potential detected. The shared genomic compliment was consistent with adaptation to the Arctic's extreme fluctuating conditions, with implications for their evolutionary history and the long-term survival of a pan-arctic microbiome. In particular, previously unrecognized genetic capabilities for methane bio-attenuation and hydrocarbon metabolism in eukaryotic phytoplankton suggest adaptation to dark conditions that will remain, despite climate warming, in the high latitude offshore waters of a future Arctic.</p>","PeriodicalId":73516,"journal":{"name":"ISME communications","volume":"5 1","pages":"ycaf007"},"PeriodicalIF":5.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11847657/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143494865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Symbiotic T6SS affects horizontal transmission of Paraburkholderia bonniea among Dictyostelium discoideum amoeba hosts. 共生的T6SS影响盘状盘齿骨虫阿米巴宿主间的bonnieparabholderia水平传播。
IF 5.1
ISME communications Pub Date : 2025-01-14 eCollection Date: 2025-01-01 DOI: 10.1093/ismeco/ycaf005
Anna Chen, Rachel M Covitz, Abigail A Folsom, Xiangxi Mu, Ronald F Peck, Suegene Noh
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