In an unprecedented exploration into the dynamic interplay between microbiota and host physiology, a groundbreaking study has illuminated the pivotal role of microbial enzymes in modulating gut motility through reactivation of host androgens. Published in Nature Neuroscience in 2026, this research uncovers how microbial metabolism intricately directs enteric neuronal circuits, reshaping our understanding of the gut-brain axis with profound implications for human health and disease.

The study embarks from the well-documented influence of androgens—steroid hormones traditionally associated with male traits—on various physiological systems. While systemic androgen effects have been explored, this investigation probes deeper into localized reactivation mechanisms within the gut environment, where microbial communities reside densely. Researchers reveal that resident gut microbes possess enzymatic functions capable of converting androgen precursors back into their active forms, effectively reawakening hormonal signaling within the enteric nervous system.

Employing a sophisticated combination of metabolomic profiling, genetic manipulation, and electrophysiological techniques, the team identified key bacterial taxa responsible for this enzymatic reactivation. Notably, these microbial metabolic activities were found to significantly enhance the bioavailability of active androgens in the gut lumen, directly influencing neuronal excitability and, consequently, gut motility patterns. This discovery bridges a vital gap between microbiome functionality and neuroendocrine regulation that had remained elusive until now.

Central to the findings is the concept that androgen reactivation by microbial enzymes fine-tunes enteric neuronal output, orchestrating peristaltic reflexes and smooth muscle contractions essential for intestinal transit. Through targeted in vivo experiments, the researchers demonstrated that disruption of this microbial androgen metabolism altered gut motility, resulting in either hypo- or hypermotility phenotypes. These effects were reversible upon restoration of the microbial enzymatic activity, suggesting a highly dynamic and plastic system governed by host-microbiome feedback loops.

Beyond the immediate mechanistic insights, this study challenges conventional paradigms by positioning gut microbes as active endocrine modulators rather than passive inhabitants. The realization that microbial metabolism can recalibrate host hormonal circuits highlights novel avenues for therapeutic intervention in gastrointestinal disorders characterized by dysmotility, such as irritable bowel syndrome and chronic constipation. Modulating microbial androgen reactivation could become a precision medicine strategy tailored to restore normal gut function.

Intriguingly, the researchers also unveiled sexually dimorphic responses in the interplay between microbial androgen reactivation and enteric neuron function. Male and female mice exhibited distinct motility patterns contingent upon variations in microbial enzymatic profiles and host androgen sensitivity, underscoring the importance of considering sex as a biological variable in gut-neuroendocrine research. This facet deepens our appreciation of individualized host-microbe interactions shaping health outcomes.

At the molecular level, the study elaborates on how microbial enzymes such as hydroxysteroid dehydrogenases catalyze reversible conversions between inactive androgen conjugates and their active counterparts. These enzymatic reactions take place in close proximity to enteric neurons, facilitating paracrine signaling that modulates neuronal firing rates and neurotransmitter release. This finely tuned mechanism enables the microbiome to exert sophisticated control over gut motility beyond mere metabolite production.

Furthermore, the research integrates advanced imaging modalities to visualize neuronal activity in real-time, correlating enhanced androgen availability with increased calcium fluxes and action potential frequency within enteric ganglia. This real-time functional evidence solidifies the link between microbial metabolic activity and neurophysiological outputs, offering a multi-dimensional perspective of gut regulatory networks. The convergence of metabolic and neuronal data lends robust credibility to the proposed model.

From an evolutionary standpoint, the elucidation of microbial androgen reactivation mechanisms hints at a co-evolved symbiotic relationship where microbes contribute to optimizing host intestinal function. This evolutionary insight expands the framework of mutualism, suggesting that microbiota-derived modulation of hormone signaling constitutes an adaptive advantage for maintaining digestive efficiency. Such findings provide fertile ground for evolutionary biology and microbiome research intersections.

The translational potential of these discoveries is immense. By identifying specific microbial enzyme targets, pharmaceutical development can aim to design modulators or probiotics that enhance or inhibit androgen reactivation within the gut, thereby controlling motility disorders. Moreover, these microbial pathways might influence systemic endocrine functions given the interconnectivity between enteric neurons and central nervous system circuits, opening exciting possibilities for neurogastroenterology.

Intricately, the study also discusses the feedback mechanisms wherein host androgens modulate microbial community composition and metabolic activity, establishing a bidirectional communication loop. This dynamic feedback ensures homeostasis by synchronizing microbial function with host hormonal status, representing an elegant biological system integrating metabolic, neuronal, and microbial domains. Such complexity underscores the need for holistic approaches in future gut-brain axis investigations.

Given the widespread prevalence of gut motility disorders, the identification of microbial androgen reactivation as a key regulatory mechanism invites renewed scrutiny of microbiome-targeted therapies. Dietary interventions, antibiotics, and microbiota transplants could inadvertently perturb these enzymatic activities, altering gut function. Therefore, medical practices may need to incorporate microbiome endocrine considerations to optimize patient outcomes and minimize adverse effects.

In conclusion, this seminal study redefines the microbial contribution to host physiology by unveiling a novel enzymatic process through which gut bacteria reactivate androgens, orchestrating enteric neuronal regulation of motility. This intricate biochemical crosstalk exemplifies the emerging frontier of microbiome-endocrine interactions with vast implications for biology, medicine, and therapeutics. As we unravel these complex dialogues, the prospect of leveraging microbial endocrinology to modulate health becomes an exciting reality.

The transformative insights gained here invite a paradigm shift: the gut microbiome is not merely a metabolic organ but an endocrine entity capable of recalibrating host neurophysiological processes. This revelation paves the way for integrative research endeavors bridging microbiology, endocrinology, neuroscience, and clinical medicine, ultimately advancing personalized healthcare in gastrointestinal and systemic diseases. Such interdisciplinary synergy heralds a new epoch of microbiome-informed biomedical breakthroughs.

As the field advances, further studies will doubtless explore how microbial androgen reactivation interfaces with other hormonal axes and systemic immunity, deepening our comprehension of host-microbiome symbiosis. The interplay between microbial enzymatic activities and host signaling cascades likely extends beyond gut motility, influencing metabolism, mood, and behavior. The future of human health hinges upon decoding these microbial endocrine networks and harnessing their potential.

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Subject of Research: Microbial enzymatic reactivation of host androgens and their role in enteric neuronal regulation of gut motility.

Article Title: Microbial reactivation of host androgens directs enteric neuronal regulation of gut motility.

Article References:
Lagomarsino, V.N., Robinson, A., Mitchell, P.E. et al. Microbial reactivation of host androgens directs enteric neuronal regulation of gut motility. Nat Neurosci (2026). https://doi.org/10.1038/s41593-026-02321-0

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41593-026-02321-0

In the intricate dance of life’s blueprint, DNA has long been celebrated as the master code guiding organismal development and heredity. Yet, the regulation of gene activity—how genes switch on and off with exquisite precision across different cellular contexts and environmental cues—extends beyond the mere sequence of nucleotides. This regulation hinges on a complex layer of control known as epigenetics. Epigenetics encompasses chemical modifications of DNA and histone proteins that influence gene expression without altering the underlying genetic code. Among these modifications, DNA methylation, the addition of methyl groups to cytosine bases within the genome, has emerged as a pivotal mechanism modulating gene activity.

In vertebrates such as mammals, a robust epigenetic “resetting” occurs shortly after fertilization. This sweeping reprogramming strips away most inherited methylation marks, effectively erasing epigenetic memories acquired during the parents’ lifetimes and thus safeguarding embryonic development from potentially deleterious epimutations. However, this epigenetic reprogramming does not appear universal across the animal kingdom. In numerous invertebrates, including marine organisms like corals, worms, sea anemones, and sea urchins, this global erasure seems conspicuously absent, hinting at fundamental evolutionary divergences in epigenetic regulation.

A groundbreaking study recently explored these differences by experimentally disrupting DNA methylation in the starlet sea anemone, Nematostella vectensis, a cnidarian species that occupies a key phylogenetic position near the base of animal evolution. By selectively removing methylation marks within its genome, researchers sought to unravel methylation’s functional importance in an organism where typical epigenetic resetting is missing. Contrary to expectations, the anemones developed normally, even in the near complete absence of DNA methylation. This surprising resilience suggested that DNA methylation’s primary role might not be to orchestrate gene expression as traditionally envisioned.

Rather than broadly compromising gene regulation, the loss of methylation predominantly unleashed the activity of transposable elements—often referred to as “jumping genes” or selfish DNA sequences—that reside within actively transcribed genes. These genetic elements possess the capacity to move within the genome, potentially inserting themselves into critical coding or regulatory regions. If not tightly suppressed, such mobilization can disrupt gene function, precipitate genomic instability, and impair normal development. The discovery that methylation chiefly acts to restrain these disruptive elements underscores an ancestral genomic defense mechanism preserved across evolutionary epochs.

Dr. Alex de Mendoza, a leading expert in evolutionary epigenomics at Queen Mary University of London, highlighted the profound implications of these findings. Because invertebrate species like sea anemones lack the typical epigenetic cleansing during early development, abnormal methylation patterns can persist and transmit to subsequent generations. This epigenetic inheritance modulates gene expression profiles beyond what genetic code alone dictates, revealing an additional layer of heritable biological information. Such phenomena demonstrate how experimentally introduced epigenetic variation can traverse generational boundaries in animals, challenging the long-held tenet that only DNA sequence changes are heritable.

Delving deeper, the research offers a novel perspective on the evolutionary trajectory of DNA methylation. Initially, this modification appears to have evolved primarily as a genomic safeguard, protecting coding sequences from the disruptive capacity of transposable elements. Over time, in mammalian lineages, this molecular machinery was co-opted and expanded to execute broader developmental regulatory roles—acting to silence one X chromosome in females and regulate complex tissue-specific gene expression programs. The study thus illuminates how molecular systems adapt and diversify, transforming ancient genomic guardians into sophisticated regulators of vertebrate biology.

Moreover, the lack of full epigenetic reprogramming in cnidarians suggests these organisms possess an inherent capacity to maintain inherited epigenetic states, providing a reservoir of variation for natural selection to act upon. Such stable transmission of epigenetic marks without underlying genetic mutation may represent an unappreciated source of phenotypic diversity and evolutionary innovation. This challenges the paradigm that heritable biological change requires DNA sequence alteration, expanding evolutionary biology’s conceptual framework to include epigenetic mechanisms in shaping organismal adaptation.

This work also emphasizes the intricate interplay between epigenetics and genome integrity. Transposable elements constitute a significant fraction of animal genomes, and their regulation is paramount to preventing genomic chaos. DNA methylation emerges as a critical regulator, keeping these elements silenced, especially within gene bodies, where their disruptive potential is highest. The failure of this epigenetic control unleashes internal genomic parasites that can jeopardize normal gene function and organismal survival.

Intriguingly, the seemingly paradoxical normal development of methylation-deficient anemones underscores redundancy and plasticity in gene regulatory networks. The absence of overt developmental defects suggests that alternative mechanisms can compensate for lost methylation-mediated repression. This resilience hints at a genome architecture finely tuned through evolution to maintain stability even when key regulatory systems falter, underscoring the robustness of biological systems.

The study not only deepens our understanding of DNA methylation’s ancestral functions but also opens avenues for exploring how epigenetic inheritance influences ecological and evolutionary dynamics in marine ecosystems. Cnidarians represent ecologically vital keystone species; thus, their capacity to pass on epigenetic traits may impact resilience and adaptation in changing oceans, with implications for biodiversity and conservation.

Beyond evolutionary insights, the research sets a foundation for new epigenetic models that integrate heritable methylation patterns with genome defense and gene regulation. It challenges researchers to reconsider the boundaries between genetic and epigenetic inheritance and to explore how ancient molecular mechanisms continue to shape life’s diversity from sea anemones to humans. This deeper comprehension may ultimately inform biomedical approaches targeting epigenetic modifications in disease and developmental biology.

In sum, this landmark investigation redefines DNA methylation’s evolutionary purpose, positing that its primordial function was genome protection rather than gene regulation per se. The delicate dance between epigenetic marks, transposable elements, and genetic regulation emerges as a foundational axis steering animal evolution and developmental fidelity. As we dive deeper into epigenomes across diverse species, the revelations from humble sea anemones remind us that evolution often innovates by repurposing age-old molecular tools in unexpected, transformative ways.

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Subject of Research: Not applicable

Article Title: Gene body methylation suppresses intragenic transcription and permits epigenetic inheritance in a cnidarian

Web References: 10.1038/s41559-026-03090-6

Image Credits: Karmannye Chaudhary

Keywords: Evolutionary biology, epigenetics, DNA methylation, transposable elements, epigenetic inheritance, cnidarian, genome stability, gene regulation, Nematostella vectensis

In the rapidly evolving arena of synthetic biology, precise gene regulation remains both a crucial goal and formidable challenge. Bacteria, with their intricate genetic networks and vital roles in biotechnology, serve as prime targets for engineering sophisticated gene control systems. Now, a groundbreaking study published in Nature Biotechnology unveils an innovative strategy harnessing an attenuated form of Cas13d—a powerful RNA-targeting CRISPR effector—to achieve programmable, multiplexed, and orthogonal gene regulation in Escherichia coli. This advancement opens unprecedented avenues for dynamic bacterial gene control, enabling nuanced modulation of gene expression with high specificity and minimal cytotoxicity.

Traditional CRISPR systems like Cas9 have revolutionized DNA editing, yet RNA-targeting effectors such as Cas13 bring unique advantages for reversible and tunable regulation without permanent genomic alterations. However, the application of Cas13 in bacteria has encountered a significant barrier: collateral cleavage activity. Wild-type Cas13 exhibits nonspecific RNA degradation once activated, leading to cytotoxicity and growth inhibition, thus impeding its widespread use for precise transcriptional tuning in prokaryotic cells. Overcoming this limitation required a reimagination of the Cas13 protein architecture.

The researchers addressed this by adopting a rational protein engineering approach, focusing on attenuating Cas13d’s RNase activity while preserving its targeted RNA knockdown capacity. They identified and excised flexible regions within the Cas13d protein structure hypothesized to contribute to unwanted collateral cleavage. This targeted truncation yielded a spectrum of Cas13d variants with tunable enzymatic activity. Notably, these engineered Cas13d proteins maintained their ability to silence specific transcripts efficiently, yet exhibited drastically reduced cytotoxicity, as evidenced by a remarkable 2.2-fold increase in bacterial growth optical density compared to cells harboring wild-type Cas13d.

Beyond simply dampening RNase activity, this attenuated Cas13d toolkit demonstrated an exquisite level of functional versatility, modulated by subtle changes in CRISPR RNA spacer design. By introducing proximal mismatches at the 5′ end of the spacer sequences, the system enables a programmable switch among three distinct modes of gene regulation: translation inhibition, targeted degradation of polycistronic mRNAs, and CRISPR activation at the translation level via fusion to the bacterial initiation factor IF3. This modularity allows tailored control strategies for diverse applications, ranging from silencing deleterious genes to upregulating beneficial pathways.

A particularly compelling aspect of this work is the system’s capability to exert multiplexed and orthogonal regulation within polycistronic transcripts—bacterial mRNAs that encode multiple proteins in a single RNA molecule. By designing guide RNAs targeting specific genes within these operons, the researchers successfully demonstrated simultaneous and independent control of individual gene expression. This level of granularity in bacterial gene editing was previously unattainable with conventional CRISPR tools and holds immense potential for engineering complex synthetic circuits with multiple inputs and outputs.

To showcase the practical utility of this attenuated Cas13d system, the team applied it to a classic microbial biotechnology challenge: optimization of lycopene biosynthesis in E. coli. Lycopene, a valuable carotenoid with health and industrial relevance, is synthesized via a multi-enzyme metabolic pathway that requires careful balancing of enzyme levels and fluxes. Employing their refined Cas13d-based regulatory toolkit, the researchers fine-tuned essential and competing genes within this pathway dynamically. The resulting pathway rewiring not only enhanced lycopene yields significantly but also maintained cell vitality, illustrating the harmony between metabolic optimization and cell health achievable with this sophisticated regulatory platform.

The implications of this advance ripple well beyond E. coli or lycopene synthesis. The modular, tunable nature of attenuated Cas13d effectors paves the way for next-generation microbial synthetic biology applications—from bioproduction of complex molecules to living biosensors that respond rapidly to environmental cues. The reversible and multiplexed control mechanism offers a potent toolset for probing fundamental bacterial gene function and constructing synthetic circuits with unprecedented precision.

Moreover, this technology elegantly sidesteps the permanent genomic disruptions characteristic of DNA-targeting CRISPR tools. By targeting RNA transcripts post-transcriptionally, this approach enables reversible modulation of gene expression states, allowing researchers to study temporal dynamics in bacterial physiology or develop programmable microbes that can switch functionalities in response to stimuli.

The engineering of Cas13d itself involved exploiting detailed structural and functional knowledge. Flexible regions previously overlooked were pinpointed as critical determinants for collateral cleavage. This insight underscores the power of combining structural biology with synthetic biology to reimagine natural effectors as finely controllable tools rather than blunt instruments. It opens the door for similar attenuation strategies to be applied to other RNA-targeting nucleases, amplifying the toolkit available for RNA biology and biotechnology.

The use of proximal spacer mismatches to toggle between inhibition, degradation, and activation states represents a clever exploitation of CRISPR RNA–target complementarity rules. This innovation decouples RNase activity from binding affinity and allows a single engineered Cas13d protein to perform multiple regulatory roles without further protein engineering, streamlining system design and increasing flexibility.

Importantly, the orthogonal targeting within polycistronic mRNAs highlights the potential for sophisticated bacteria-wide gene regulation at the RNA level. Since many bacterial operons encode functionally linked proteins, this ability to recalibrate individual gene outputs independently provides a powerful lever to dissect and rewire bacterial gene networks with minimal disturbance to overall cellular integrity.

The improved growth performance of bacteria expressing attenuated Cas13d variants is a vital advancement for biotechnological deployment. The reduced toxicity facilitates higher cell densities and longer cultivation times, improving production scalability. This contrasts sharply with previous Cas13 systems, where collateral damage to cellular RNAs often stagnated growth and limited practical utility.

From therapeutic applications aiming to modulate microbial communities to industrial biosynthesis frameworks requiring dynamic metabolic flux control, the attenuated Cas13d toolkit stands as a versatile and impactful innovation. It bridges longstanding gaps in RNA-targeting technologies, balancing potency with biocompatibility and programmability.

In conclusion, this study represents a seminal step in realizing dynamic, multiplexed, and reversible gene control in bacteria through rational engineering of Cas13d. By attenuating collateral cleavage and introducing spacer design-based functional switching, the authors have delivered a powerful RNA regulatory toolkit poised to transform microbial synthetic biology and biotechnology. Future research will undoubtedly explore expanding this system to diverse bacterial species, integrating it with other synthetic genetic elements, and harnessing its potential for real-time cellular reprogramming.

The scientific community is certain to embrace this versatile platform, which not only enhances our capacity to engineer bacteria but also deepens our understanding of RNA biology and CRISPR functionality. As synthetic biology marches forward, such innovations redefine the frontier of microbial gene control, unlocking new possibilities from medicine to sustainable biomanufacturing.

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Subject of Research:
Programmable, multiplexed, orthogonal gene control in bacteria using engineered, attenuated Cas13d systems.

Article Title:
Programmable, multiplexed and orthogonal gene control in bacteria with attenuated Cas13d systems.

Article References:
Tong, S., Qin, Y., Sun, Y. et al. Programmable, multiplexed and orthogonal gene control in bacteria with attenuated Cas13d systems. Nat Biotechnol (2026). https://doi.org/10.1038/s41587-026-03160-x

Image Credits:
AI Generated

DOI:
https://doi.org/10.1038/s41587-026-03160-x

President Donald Trump signed an executive order Tuesday creating a "voluntary framework" for AI companies to share their frontier models with the federal government before they're released "to promote secure innovation and strengthen the cybersecurity of critical infrastructure."

The order says the US AI industry has succeeded in part "because we refuse to stifle this innovation with overly burdensome regulation," but that it also recognizes new AI capabilities come with security risks. Accordingly, it directs several federal agencies to come up with a framework to "assess the advanced cyber capabilities of AI models" before they're releas …

Read the full story at The Verge.

AI player Anthropic confidentially submitted paperwork for its proposed initial public listing ahead of rival OpenAI, while also giving the European Union’s cybersecurity body preliminary access to its Mythos AI tool.

The draft registration statement submitted to the US Securities and Exchange Commission gives the company the option to go public after the agency completes its review.

Anthropic stated the number of shares to be offered and the price have not yet been set.

News of the IPO move came the same day (1 June) Bloomberg reported Anthropic will give ENISA, the European Union’s cybersecurity agency, access to Mythos through Project Glasswing, an initiative which allows organisations to test Mythos’ capabilities before a wider release.

There are growing concerns among governments over the security implications of Mythos, which Anthropic released to some private companies in April.

Anthropic communicated the decision to the European Commission over the weekend.

EC spokesperson Thomas Regnier confirmed the development to Mobile World Live (MWL) followed several weeks of productive discussions.

 “We welcome the latest developments on potential future access,” he said. “This is the result of the Commission’s strong bilateral cooperation and engagement with Anthropic, a leading frontier AI company.”

The EC was careful to frame the moment not as a resolution but as a starting point to work with the US administration, Anthropic and additional AI companies such as OpenAI.

“This is a shared challenge, and we are intensifying our discussions with like-minded partners, including the United States,” Regnier said.

The plan is for ENISA to join Project Glasswing, the coalition Anthropic announced in April which includes Amazon, Apple, AT&T, T-Mobile US, Microsoft, Google, CrowdStrike, Nvidia and Palo Alto Networks, among others.

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