Michaël Deghelt , Elisa S. Pierre Despas , Jean-François Collet
{"title":"The cell envelope of diderm bacteria: a unified scaffold, not a stack of layers","authors":"Michaël Deghelt , Elisa S. Pierre Despas , Jean-François Collet","doi":"10.1016/j.mib.2025.102681","DOIUrl":"10.1016/j.mib.2025.102681","url":null,"abstract":"<div><div>The cell envelope of diderm (Gram-negative) bacteria is a defining structural and functional feature, ensuring mechanical integrity, supporting growth, and enabling adaptation to diverse environments. Traditionally viewed as a stack of discrete layers — the inner membrane, peptidoglycan, and outer membrane — this architecture is now recognized as a mechanically and physiologically integrated system. Recent advances have shown that envelope components are assembled and maintained in a coordinated manner, with physical and functional linkages bridging the different layers. In this review, we examine how these connections contribute to envelope biogenesis, homeostasis, and stress adaptation, using <em>Escherichia coli</em> as a reference model. We also discuss the evolutionary diversity of peptidoglycan-outer membrane attachment strategies across bacterial phyla, highlighting their conserved role in maintaining envelope cohesion. Together, these findings support a revised view of the envelope as a unified and dynamic structure, whose integrity depends on the coordinated activity of all its components.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102681"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145473860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Applicability of synthetic communities of the infant gut microbiota to understand microbial dynamics in an interchanging glycan landscape","authors":"Athanasia Ioannou, Clara Belzer","doi":"10.1016/j.mib.2025.102659","DOIUrl":"10.1016/j.mib.2025.102659","url":null,"abstract":"<div><div>Researchers are exploring synthetic communities to better understand infant gut microbiota interactions. These reduced-diversity communities consist of specific strains tailored to research questions, eliminating the need for fecal sample collection. They allow detailed characterization of composition and functionality, enabling studies on ecological processes like priority effects by adjusting growth conditions or member dispersal. Synthetic communities help test complex microbial dynamics across various setups (<em>in vitro</em>, <em>in vivo</em>, <em>ex vivo</em>, <em>in silico</em>) to investigate interactions and host relationships. They are particularly useful for studying the impact of diet and drugs on microbiota formation and their direct or indirect effects on infant immune and barrier maturation. As research models, synthetic communities offer insights into microbial ecosystems, advancing our knowledge of gut microbiota development and its broader implications.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102659"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The role of mobile genetic elements in adaptation of the microbiota to the dynamic human gut ecosystem","authors":"Katherine Schubert, Teni Shosanya, Leonor García-Bayona","doi":"10.1016/j.mib.2025.102675","DOIUrl":"10.1016/j.mib.2025.102675","url":null,"abstract":"<div><div>The human intestinal microbiota is a dynamic ecosystem shaped by extensive horizontal gene transfer, particularly in individuals from industrialized populations. In this review, we discuss recent advances in our understanding of how mobile genetic elements (MGEs) contribute to microbial ecology and evolution in this diverse community, focusing on MGEs carrying fitness-conferring genes. Bacteroidales species can colonize individuals for decades and serve as major hubs for MGE exchange. Most MGEs are highly variable across individuals and geographies. Occasionally, conserved MGEs can spread across geography and lifestyles. Functional characterizations of MGEs reveal their roles in antibiotic resistance, interbacterial antagonism, biofilm formation, immune evasion, and nutrient acquisition, among others. Substantive progress in our understanding of MGEs in the gut microbiome offers promising avenues for therapeutic microbiome interventions. However, major challenges remain in functional prediction, host-MGE linkage, and experimental characterization.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102675"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Trace gas oxidation as a novel microbial dispersal trait","authors":"Lucas Barbieri Oliveri , Pok Man Leung","doi":"10.1016/j.mib.2025.102666","DOIUrl":"10.1016/j.mib.2025.102666","url":null,"abstract":"<div><div>Dispersal is a fundamental ecological process that enables colonization of new environments and controls community diversity. While decades of observational studies have shown a high dissemination capacity of microorganisms, the energetic mechanisms underlying long-range dispersal and persistence outside their optimal niches remain largely unexplored. Here, we outline a categorical framework of metabolic strategies adopted by microbes to conserve energy during dispersal. A key highlight is the recent realization of trace gas oxidation as a novel and widespread trait in diverse bacteria and archaea. Such continual energy acquisition from ubiquitous and energy-dense hydrogen and carbon monoxide gases in air sustains the cellular maintenance energy need at suboptimal conditions, promoting persistence during dispersal across terrestrial surfaces. We propose that future research should assess the contribution of metabolic traits to differential dispersal capability and biogeographical patterns of microorganisms.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102666"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jack Dorling, Georgia Love, Isobel K. Banks, Antony N. Dodd
{"title":"Circadian interactions between plants and microorganisms","authors":"Jack Dorling, Georgia Love, Isobel K. Banks, Antony N. Dodd","doi":"10.1016/j.mib.2025.102655","DOIUrl":"10.1016/j.mib.2025.102655","url":null,"abstract":"<div><div>Life on Earth evolved in environmental conditions that fluctuate with a daily cycle. Organisms from all kingdoms of life, including plants and their associated microorganisms, harbour circadian clocks as an adaptation to these environmental changes. We review the involvement of circadian clocks in associations between plants and microbes, focusing first on mechanisms of specific circadian clock-regulated plant–microbe interactions. We then discuss more general ecological and evolutionary consequences of clock regulation of plant–microbe interactions and argue that circadian clocks can choreograph complex plant–microbe community interactions across multiple levels of biological organisation. We also discuss the difficulties in determining the precise nature of interactions in such communities, for both individual rhythmic interactions and the emergent rhythmic properties of these communities. An understanding of the regulation of these interactions by circadian clocks is likely to have implications for crop performance, fertiliser and pesticide use, soil and ecosystem health, biogeochemical cycling, and the impacts of global warming.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102655"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144841909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Diversity and evolution of alphaproteobacterial dimorphism","authors":"Joel Hallgren , Kristina Jonas","doi":"10.1016/j.mib.2025.102661","DOIUrl":"10.1016/j.mib.2025.102661","url":null,"abstract":"<div><div>Many bacteria have complex pleomorphic lifecycles — a feature particularly widespread across the class <em>Alphaproteobacteria</em> of the phylum <em>Pseudomonadota</em>. While research on bacteria with pleomorphic lifecycles has for many years focused on the dimorphic bacterium <em>Caulobacter crescentus</em>, more recent studies on less established alphaproteobacterial model bacteria have uncovered diverse variations of bacterial pleomorphism. Here, we provide an overview of the diversity and evolution of the complex lifecycles among dimorphic <em>Alphaproteobacteria</em> and highlight the presence of analogous lifecycles in unrelated bacteria across the bacterial domain. We discuss the commonalities and differences between dimorphic species, as well as the selective pressures that might have sculpted their lifecycles. Furthermore, we exemplify how the cellular appendages common among dimorphic <em>Alphaproteobacteria</em>, referred to as prosthecae, are not inherently linked to dimorphism. Finally, we highlight how the large diversity of dimorphic <em>Alphaproteobacteria</em> can be used to shed light onto the evolution of bacterial cell biology.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102661"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Editorial overview: Antibiotic discovery: Feeding the pipeline or finding new pipes?","authors":"Joshua AV Blodgett , Justin R Nodwell","doi":"10.1016/j.mib.2025.102680","DOIUrl":"10.1016/j.mib.2025.102680","url":null,"abstract":"","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102680"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145430549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Microbial biomolecular condensates: from conserved principles to synthetic biology opportunities","authors":"Donté A Stevens, Keren Lasker","doi":"10.1016/j.mib.2025.102677","DOIUrl":"10.1016/j.mib.2025.102677","url":null,"abstract":"<div><div>Biomolecular condensates are membraneless compartments that organize cellular activities by selectively concentrating molecules into dynamic, reversible assemblies. Once thought to be a eukaryotic innovation, condensates are now recognized as a broadly distributed compartmentalization strategy, shaped by conserved physical principles and adapted across diverse microbial lineages. In this review, we examine how condensates operate across the microbial domains of life, revealing a modular framework where shared biophysical rules are tuned by evolutionary forces to meet distinct cellular demands. Understanding the interplay between constraint and innovation deepens our view of microbial cell biology and enables the design of programmable condensates for synthetic applications.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102677"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145291548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Martina Shahinas, Belen Pachano, Marie G Robert, Christopher Swale, Mohamed-Ali Hakimi
{"title":"Decoding the epigenetic blueprint behind Toxoplasma (pre)sexual commitment and chronic persistence","authors":"Martina Shahinas, Belen Pachano, Marie G Robert, Christopher Swale, Mohamed-Ali Hakimi","doi":"10.1016/j.mib.2025.102662","DOIUrl":"10.1016/j.mib.2025.102662","url":null,"abstract":"<div><div><em>Toxoplasma gondii</em>, a widespread apicomplexan parasite, navigates a complex life cycle in which it switches back and forth between tachyzoites and bradyzoites to balance acute infection and persistence while also undergoing an often-overlooked one-way commitment to the sexual stage. Emerging evidence suggests that <em>Toxoplasma</em>’s developmental trajectories are orchestrated by an interconnected network of transcriptional switches and chromatin remodeling mechanisms, acting in concert to ensure robust stage transitions. This review outlines an updated epigenetic framework for stage transitions and highlights the functional synergy between an Imitation SWItch family chromatin remodeler and the MORC/HDAC3 repressor complex, which together modulate chromatin accessibility to maintain or shift developmental states. We also spotlight recent findings, showing that simultaneous depletion of AP2XII-1 and AP2XI-2 transcription factors reactivates the presexual program <em>in vitro</em>, eliminating the need for cat hosts and allowing ethical, scalable exploration of sexual stages. Strikingly, the knockdown of these transcription factors also reveals a previously unrecognized hybrid zoite co-expressing bradyzoite and merozoite markers, suggesting a transitional state that defies classical stage definition. This hybrid form, as well as more recent data on bradyzoite development, support a new model in which <em>T. gondii</em> development unfolds along a continuum of epigenetically primed states rather than a rigid sequence of binary fate decisions. These findings provide a powerful conceptual and experimental framework for dissecting parasite transmission and persistence and have far-reaching implications for the biology of other parasites in the phylum.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102662"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Subcellular organization of the archaeal cell","authors":"Arthur Charles-Orszag , Sonja-Verena Albers","doi":"10.1016/j.mib.2025.102679","DOIUrl":"10.1016/j.mib.2025.102679","url":null,"abstract":"<div><div>Bacteria and archaea generally do not possess membrane-bound internal compartments. However, they both need to specifically control the localization of proteins (e.g. to the septum during cell division or to the cell poles as is the case for the archaellation machinery), spatially separate incompatible biochemical reactions, or actively transport larger intracellular cargos such as chromosomes. Yet, little is known about whether and how the distribution of certain proteins, DNA, or other molecules is regulated in archaea. Here, we will present examples of intracellular compartments in archaea and discuss recent mechanistic insights into how archaeal cells control the subcellular localization of molecular machines.</div></div>","PeriodicalId":10921,"journal":{"name":"Current opinion in microbiology","volume":"88 ","pages":"Article 102679"},"PeriodicalIF":7.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145408369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}