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Open research questions in Gut microbiota and health

289 unresolved questions extracted from the limitations and future-work sections of 1,338 Gut microbiota and health papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • While prior work has demonstrated that food allergy can be modulated by gut microbes, little is known about how food allergen-specific CD4+ T cells are affected by gut microbial composition.

    Gut microbial composition modulates food-specific CD4+ T cells in food allergy 2256989 · 2026 · DOI

  • This review highlights growing evidence that infection-associated gut dysbiosis may contribute to long-term variability in neuroinflammatory susceptibility by influencing systemic immune homeostasis. A key mechanistic insight is that microbiota-derived metabolites, including SCFAs and tryptophan-derived indole compounds, may interact with host epigenetic machinery, thereby linking peripheral immune activity to sustained transcriptional regulation in innate immune cells. Microglia represent a central interface in this process due to their longevity and capacity for functional adaptation.

    Infection-driven gut dysbiosis and epigenetic programming of microglia: toward a systems level framework linking microbial metabolites, neuroinflammation, synaptic dysfunction, and probiotic modulation · 2026 · DOI

  • This review highlights growing evidence that infection-associated gut dysbiosis may contribute to long-term variability in neuroinflammatory susceptibility by influencing systemic immune homeostasis. A key mechanistic insight is that microbiota-derived metabolites, including SCFAs and tryptophan-derived indole compounds, may interact with host epigenetic machinery, thereby linking peripheral immune activity to sustained transcriptional regulation in innate immune cells. Microglia represent a central interface in this process due to their longevity and capacity for functional adaptation.

    Infection-driven gut dysbiosis and epigenetic programming of microglia: toward a systems level framework linking microbial metabolites, neuroinflammation, synaptic dysfunction, and probiotic modulation · 2026 · DOI

  • Longitudinal studies incorporating direct assessments of gut microbiota composition and microbial metabolites are warranted to clarify the long-term implications of SMD adherence for metabolic and neuroimmune health.

    Association of the sulfur microbial diet with metabolic profile, gut-related biomarkers, and adiposity indicators in adults with overweight and obesity · 2026 · DOI

  • Even for approaches with mechanistic promise, such as FMT, long-term efficacy, safety, and reproducibility remain insufficiently characterized[212].

    Targeting gut microbiota: Potential mechanisms in the pathogenesis of type 2 diabetes mellitus and emerging translational intervention strategies · 2026 · DOI

  • The gut–brain-immune axis in neonatal HI is a young but evolving field positioned to move from descriptive correlation towards mechanistic causality and clinical translation. To summarize the previous sections, main findings are graded by the strength of evidence in Table 1, distinguishing four levels: human association (correlational, typically confounded by clinical care), animal causality (interventional, e.g. faecal microbiota transplantation), extrapolation from adult stroke or non-HI inflammatory models, and therapeutic speculation. From this overview, two research priorities can be defined: unaddressed mechanistic links and conceptual gaps in preclinical and clinical study designs (Table 2). At the conceptual level, two questions remain. First, sex differences are well documented separately for the developing brain, immune system and gut microbiota [86–88]. HI itself produces sex-specific patterns of lesion size, microglial activation, cell-death pathways and peripheral immune cell function [47, 89–92]. Whether sex-specific gut dysbiosis contributes to these dimorphic brain and immune responses has not been examined. Sex-stratified designs in both preclinical and clinical studies will be essential to avoid missing biologically relevant effects. Second, the developmental memory of perinatal microbial perturbations and its potential impact on lifelong immunity and neurological function remain poorly defined. Clinical and preclinical data are sparse and inconsistent. After caesarean section, overall microbiome structure normalizes as the gut matures although selected genera differ at five years. Rodent prebiotic supplementation from P5 to P14/15 produces a community that is no longer detectable in adulthood, whereas perinatal fructo-oligosaccharides in pigs persistently modulate the adult faecal microbiota at nine months. A large population-based study did not find a consistent association between adult microbiome composition and early-life events. The absence Herz et al. Molecular and Cellular Pediatrics (2026) 13:39 Table 1 Levels of evidence underlying the principal claims of this review Page 9 of 14 A Animal causality, H Human association, E Extrapolation from adult stroke or non-HI models, T Therapeutic speculation of an enduring microbial signature does, however, not exclude a "developmental priming", by which transient perturbations during critical windows shape immune programming with lifelong consequences. This is, for example, illustrated by maternal fiber deprivation, which alters offspring microbiota and predisposes to low-grade inflammation and obesity. HI insults superimposed on antibiotic exposure may therefore unmask or amplify Herz et al.

    Gut-brain-immune interactions in neonatal hypoxic–ischemic brain injury · 2026 · DOI

  • remain to be defined, and the possibility of a plateau in Third, TNF-α was measured at a single time point, which the dose-response relationship beyond the doses tested cannot capture the dynamic evolution of inflammation here cannot be excluded from the present data.

    Synergistic Reduction of TNF-α by Combined Ursodeoxycholic Acid and Multi-Strain Probiotics in a Rat Model of Cholestasis · 2026 · DOI

  • Conclusion Together, these results suggest that the ENS functions as a sensor-effector hub, linking local GI infection to rapid, body-wide immune responses, and highlighting a previously understudied role for the ENS in systemic host defenses.

    The Enteric Nervous System Primes Systemic Immunity in Response to Mucosal Infection 2258662 · 2026 · DOI

  • Abstract Introduction The gut microbiota is an emerging regulator of neuroinflammatory diseases like Multiple Sclerosis (MS), but the mechanisms underlying microbiota-immune crosstalk are not fully understood.

    Gut bacteria-specific IgG regulates CNS neuroinflammation 2309610 · 2026 · DOI

  • BackgroundEarly-onset colorectal cancer (EOCRC) is increasing globally, particularly among Hispanic/Latino (H/L) populations, yet the contribution of tumor-colonizing microbiota to age-associated colorectal cancer (CRC) biology remains poorly understood.

    Tumor-Colonizing Microbiota Distinguish Early- and Late-Onset Colorectal Cancer in a Hispanic/Latino Patient Cohort · 2026 · DOI

  • Further research into gene–environment interactions is needed not only to advance understanding of disease pathogenesis, but also to inform preventative, cost-effective, and personalized therapeutic strategies that reduce exposure to harmful environmen- tal modifiers in genetically at-risk individuals.

    Environment shapes gut microbiome and determines susceptibility to DSS-colitis in Adamdec1-/- mice · 2026 · DOI

  • Our results suggest the microbiome community needs to examine the terminology and analytic approaches for combining datasets; that additional work is needed to explore the impact of data source on bias in combined studies; and evaluation of methods used for feature table construction across disjoint regions is needed.

    In harmony? A scoping review of methods to combine multiple 16S amplicon datasets · 2026 · DOI

  • Conclusions: Current evidence suggests an association between CRC-associated cachexia and gut microbiome alterations, but causality, directionality, and clinical relevance remain uncertain.

    The Association Between Gut Microbiome and Cachexia in Colorectal Cancer: A Systematic Review · 2026 · DOI

  • In addition, the reproducibility of the results has not been confirmed so far, and more experiments need to be conducted [3]. At present, some initial results have been obtained from the beginning of clinical trials on the feasibility of prevention and early treatment of Alzheimer's disease using "nutritional intervention targeting intestinal microecology", but the data are still scarce and scattered.

    Nutritional Intervention Strategies for Alzheimer's Disease from the Perspective of the Gut-Brain Axis · 2026 · DOI

  • The era of brain-centered neurology is giving way to a more integrated biological perspective in which the brain-gut axis and the microbiota redefine neuronal health. In this context, the human mind is now considered as an extension of the microbial ecosystem, shaped by the interaction between the human genome and the microbial metagenome, within the framework of the developmental origins of health and disease (DOHaD). This research theme entitled “Role of the microbiota in neurocognitive disorders: a developmental perspective” brings together 12 review and research articles that collectively map how the microbiota has shaped human evolution and health. The story begins from the earliest stages of life, where the microbiota acts as a key architect shaping the development of the nervous system. Mallick et al. provide in their paper the foundation of this developmental perspective, by examining how early microbial colonization is a prerequisite for neuronal maturation. However, this founding period is fraught with “hidden gateways” to “pathology.” Mohamed et al. offer a cautionary tale about how early iatrogenic disordersespecially NSAID-induced dysbiosis can trigger autoimmune responses and worsen autism spectrum disorders (ASD). This link between microbial metabolic production and neurodevelopment is further hardened by Serrano-Tomás et al., whose meta-analysis identifies p-cresol as a tangible metabolic signature of the severity of ASD, transforming an intestinal by-product into a clinical compass. As the axis matures, the complexity of the actors involved in the brain-gut axis increases. This Research Topic enhances the mycobiome and the molecular master-regulators to the dominant bacteriocentric model. The fungal dimension was treated by Hadrich et al. and Wang et al. These authors provide proof that fungi such as Candida and Saccharomyces, are not passive residents but active modulators of schizophrenia, depression and attention deficit/hyperactivity disorder (ADHD). Extending this framework, Mohammadi-Pilehdarboni et al.

    Editorial: Role of microbiota in neurocognitive disorders: a developmental origin perspective · 2026 · DOI

  • Although both PA and OSA have been individually linked to gut microbiome alterations, it remains unclear which layer of gut microbiome-associated variation best reflects clinical heterogeneity in PA with coexisting OSA.

    Metagenomic and metabolomic profiling in primary aldosteronism with coexisting obstructive sleep apnea · 2026 · DOI

  • This review synthesizes current evidence regarding the role of the gut microbiota in pediatric MASLD, focusing on pathogenetic pathways, reported microbial patterns, and microbiota-targeted therapeutic strategies, while incorporating relevant mechanistic evidence from adult studies where pediatric data remain limited.

    Gut Microbiota and Metabolic Dysfunction-Associated Steatotic Liver Disease: From Dysbiosis to Metagenomic Insights and Therapeutic Perspectives · 2026 · DOI

  • ABSTRACT Background Interleukin‐17A (IL‐17A) is a key pro‐inflammatory cytokine implicated in acute myocardial infarction, but its upstream regulatory mechanisms remain unclear.

    Gut <i>Barnesiella intestinihominis</i> Exacerbates Post‐Myocardial Infarction Injury via Succinate‐Driven <scp>MAPK3</scp> Succinylation/Phosphorylation Cascade in γδ T Cells and Downstream <scp>IL</scp> ‐ <scp>17A</scp> – <scp>NLRP3</scp> Axis · 2026 · DOI

  • In this study, MR analysis showed that there was a potential mutually causality between gut microbiota and the risk of AF, which may provide new insights for further studies of the role of gut microbiota in AF pathophysiology and development.

    Bidirectional Mendelian randomization study on the association between gut microbiota and atrial fibrillation · 2026 · DOI

  • While the gut microbiota has been linked to several cardiovascular diseases, its direct causal relationship with AF remains unclear, and the underlying “gut–heart” axis hypothesis requires validation.

    Bidirectional Mendelian randomization study on the association between gut microbiota and atrial fibrillation · 2026 · DOI

  • Abstract Background Idiopathic epilepsy (IE) is the most common chronic nervous system disorder of dogs, and its cause is poorly understood.

    Gut microbiome alterations in canine idiopathic epilepsy: a pairwise case-control study · 2026 · DOI

  • Dietary fiber has emerged as a promising modulator of gut microbial metabolism, yet the influence of fiber physicochemical properties, particularly fermentability and viscosity, on uremic metabolite production in CKD remains poorly understood.

    The effect of dietary fiber based on fermentability and viscosity on the gut microbial metabolites in chronic kidney disease: a systematic review and meta-analysis of experimental and clinical trials · 2026 · DOI

  • A major challenge during inflammation is exposure to host-derived reactive nitrogen species (RNS), which damage macromolecules and impair microbial fitness, but how commensals orchestrate defense against nitrosative stress remains poorly defined.

    A nitrite-responsive regulatory RNA locus sustains commensal resilience against nitrosative stress · 2026 · DOI

  • muciniphila exacerbated EAE and increased serum miR-21, whereas monocolonization of germ-free mice was insufficient to induce systemic miR-21, indicating a requirement for an inflammatory host environment.

    Akkermansia muciniphila-derived LPS links gut dysbiosis to pathogenic miR-21 signaling in experimental autoimmune encephalomyelitis. · 2026 · DOI

  • Western-style diets, characterized by high fat and protein and low micronutrient content, represent a sustained ecological perturbation linked to colorectal cancer (CRC), yet specific mechanisms that impact risk remain poorly defined.

    Diet links gut chemistry with cancer risk in C57Bl/6 mice and human colorectal cancer patients · 2026 · DOI

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289 open questions have been extracted from the limitations and future-work passages of 1,338 Gut microbiota and health papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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