WikiBiomeThe human microbiome encyclopediaRanked matches across titles, topics, categories, and article introductions.
A 140-amino-acid presynaptic protein whose misfolding into insoluble fibrils and their deposition in Lewy bodies is the defining neuropathological hallmark of parkinsons disease and the broader family of synucleinopathies (including Lewy body dementia and multiple syste…
The most common form of dementia, affecting an estimated 55 million people worldwide and projected to triple by 2050 zhang 2024 recent advances alzheimers mechanisms trials. Characterized by progressive memory loss, cognitive decline, amyloid-beta plaques, and neurofibr…
Amyloid-beta (Aβ) is a 36–43 amino acid peptide derived from the proteolytic cleavage of amyloid precursor protein (APP) by beta-secretase (BACE1) and gamma-secretase. Its aggregation from soluble monomers into insoluble fibrillar plaques in the brain is the defining ne…
The process by which soluble amyloid-beta (Aβ) monomers assemble into neurotoxic oligomers and insoluble fibrillar plaques in the brain -- the defining neuropathological event of alzheimers disease. What distinguishes WikiBiome's treatment of this process from conventio…
Anxiety disorders are the most prevalent mental health conditions globally, affecting ~280 million people (~4.8% of the world population). They encompass generalized anxiety disorder (GAD), social anxiety, panic disorder, and phobias. In the WikiBiome context, anxiety f…
A neurodevelopmental condition affecting approximately 1 in 36 children (US CDC 2023 estimate), characterized by differences in social communication, restricted interests, and repetitive behaviors. From a metallomics perspective, ASD presents a compelling convergence of…
BDNF is the primary neurotrophin supporting neuronal survival, synaptic plasticity, and memory formation in the hippocampus and prefrontal cortex. Reduced BDNF is a consistent finding in depression, schizophrenia, and neurodegeneration. The gut microbiome modulates BDNF…
Bifidobacterium breve is a Gram-positive, obligate anaerobic species within the phylum Actinobacteria, predominantly found in the infant gut and breast milk. It is among the earliest colonizers of the neonatal intestine and plays a key role in human milk oligosaccharide…
Bipolar disorder is a chronic neuropsychiatric condition characterized by recurrent episodes of mania (or hypomania) and depression, affecting approximately 1-2.4% of the global population. It carries significant morbidity -- reduced life expectancy by 10-15 years, high…
Cerebral palsy (CP) is the most common motor disability in childhood, affecting 2-3 per 1,000 live births allen 2021 multi organ dysfunction cerebral palsy. Characterized by non-progressive disturbances in movement and posture arising from injury to the developing brain…
Depression is the most prevalent mental health disorder globally, affecting over 280 million people zhu 2025 microbiota gut brain axis depression review, and one of the most metal-sensitive conditions in this wiki. It sits at the convergence of nearly every pathway cata…
Dialister is a genus of Gram-negative, obligate anaerobic bacteria within the family Veillonellaceae that represents one of the strongest protective associations in gut-brain-axis research. Dialister depletion is a consistent and independent biomarker of depression, anx…
Dopamine is a catecholamine neurotransmitter central to reward, motivation, motor control, and executive function. Its synthesis is directly dependent on iron -- the rate-limiting enzyme tyrosine hydroxylase (TH) requires Fe2+ as a cofactor. This iron dependency makes d…
Epilepsy is a chronic neurological disorder characterized by recurrent unprovoked seizures, affecting ~50 million people worldwide. Approximately 30% of patients have drug-resistant epilepsy -- a population where microbiome-targeted interventions (particularly the ketog…
Estrogen recirculation is the recycling loop by which conjugated estrogens excreted in bile are deconjugated by gut bacterial beta glucuronidase, reabsorbed across the intestinal epithelium, and returned to systemic circulation uzuner 2023 bidirectional relationship end…
Fecal microbiota transplant (FMT) for ASD aims to replace the dysbiotic gut community with a diverse donor microbiome. Open-label results show improvements in both GI symptoms and behavioral measures, but benefits are lost within weeks after cessation.
Fibromyalgia (FM) is a chronic pain syndrome affecting 2-4% of the global population Heidari et al. 2017, characterized by widespread musculoskeletal pain, fatigue, cognitive dysfunction ("fibro fog"), and sleep disturbances. Conventionally attributed to central sensiti…
Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system. In the WikiBiome context, GABA is notable because gut bacteria produce it — certain Lactobacillus and Bifidobacterium species possess glutamate decarboxylase (GAD) e…
The community of trillions of microorganisms — bacteria, archaea, fungi (mycobiome), viruses, and bacteriophages — inhabiting the human gastrointestinal tract, with the highest density in the colon (~10¹¹ cells/g). The gut microbiome encodes 100–150 times more genes tha…
Bidirectional communication between the gut microbiota and the central nervous system, mediated by neural (vagus nerve, enteric nervous system), immune (cytokines, microglia), endocrine (HPA axis), and metabolic (SCFAs, neurotransmitter precursors, tryptophan metabolite…
The relationship between heavy metals and the gut microbiota is bidirectional: metals reshape microbial community composition and metabolic output, while the microbiota modulates metal absorption, speciation, and toxicity. The gut microbiota serves as the first line of …
heavy metals exert some of their most devastating effects on the nervous system. lead, mercury, and arsenic are the three metals with the most extensively documented neurotoxic mechanisms, but cadmium, manganese, aluminum, and nickel also contribute to neurological dama…
Microbial tryptophan metabolites produced by gut bacteria through the third branch of tryptophan metabolism -- the indole pathway. Unlike the host-dominated kynurenine pathway (~95% of Trp) and the serotonin pathway (~1-2%), the indole pathway is exclusively microbial a…
Interleukin-6 is a pleiotropic cytokine that sits at the crossroads of innate immunity, adaptive immunity, and metabolism. It is one of the most frequently elevated inflammatory mediators across conditions in this wiki — appearing in disease signatures spanning IBD, aut…
Lactobacillus reuteri is one of the most extensively studied probiotic species, notable for its production of neuroactive metabolites (GABA, histamine) and its effects on the hypothalamic-pituitary-gonadal axis (testosterone, oxytocin).
Leptin is an adipokine (hormone produced by adipose tissue) that signals satiety to the hypothalamus — suppressing appetite and increasing energy expenditure. Leptin resistance (elevated leptin with impaired signaling) is a hallmark of obesity, paralleling insulin resis…
Post-acute sequelae of SARS-CoV-2 infection (PASC), affecting an estimated 10-30% of COVID-19 survivors (WHO and CDC post-acute surveillance estimates) with symptoms persisting 12 weeks. Characterized by fatigue, cognitive dysfunction ("brain fog"), exercise intolerance…
Major depressive disorder (MDD) is a psychiatric condition characterized by persistent depressed mood, anhedonia, and cognitive/somatic symptoms. In the WikiBiome framework, MDD is a paradigm case for the gut brain axis: gut dysbiosis drives systemic inflammation and ne…
Microbiome-derived metabolites are small molecules made, consumed, or chemically transformed through activity in the gut microbiome and other host-associated communities. They connect community function to host biology, but the phrase covers several kinds of provenance:…
Microglia are the resident immune cells of the central nervous system, constituting 5-12% of all brain cells. They function as the brain's surveillance and defense system -- scanning for damage, clearing debris, pruning synapses during development, and mounting inflamma…
Migraine is a complex neurological disorder characterized by recurrent episodes of moderate-to-severe headache, often unilateral and pulsatile, accompanied by nausea, photophobia, and phonophobia. Affecting over one billion people worldwide, it is the second leading cau…
Multi-strain synbiotic supplementation (probiotic + prebiotic) as adjunctive therapy alongside antipsychotics. This is the strongest validated microbiome-targeted intervention for schizophrenia, with both psychiatric symptom improvement and metabolic benefit demonstrate…
Multiple sclerosis (MS) is a chronic autoimmune demyelinating disease of the central nervous system, with a global prevalence of approximately 2.8 million attfield 2022 immunology ms nature review. The conventional framing centers on genetic susceptibility (HLA-DRB115:0…
An umbrella concept encompassing the metallomic dimensions of Alzheimer's disease, Parkinson's disease, and other neurodegenerative conditions. The brain is uniquely vulnerable to metal toxicity: it has high metabolic demand, limited regenerative capacity, region-specif…
Neuroinflammation is an immune response within the central nervous system (CNS)—the brain and spinal cord. It involves changing states of microglia, astrocytes, cells of the neurovascular unit, and, in some settings, immune cells recruited from the circulation. The resp…
A microbial metabolite produced by gut bacteria through tyrosine fermentation that has emerged as one of the most consistent biomarkers linking gut dysbiosis to neurological and renal disease. p-Cresol (4-methylphenol) is a simple aromatic compound, but its effects are …
The second most common neurodegenerative disease, affecting over 10 million people worldwide dorsey 2018 parkinsons incidence meta analysis. Characterized by progressive loss of dopaminergic neurons in the substantia nigra, alpha-synuclein aggregation (Lewy bodies), and…
Postpartum depression (PPD) affects 10-20% of women after delivery, with profound consequences for maternal health, infant bonding, and child neurodevelopment chao 2025 microbiota gut brain perinatal depression. The standard framing centers on hormonal withdrawal (estro…
Probiotic supplementation targeting depleted Bifidobacterium and Lactobacillus in the postpartum period aims to restore gut-brain axis signaling disrupted during the dramatic hormonal shifts following delivery.
A three-carbon short-chain fatty acid (SCFA) produced primarily by Bacteroidetes and certain Firmicutes through anaerobic fermentation of dietary substrates. At physiological concentrations in healthy gut microbiomes, propionic acid (PPA) is a normal fermentation produc…
A severe neuropsychiatric disorder affecting approximately 1% of the global population, characterized by positive symptoms (hallucinations, delusions), negative symptoms (anhedonia, social withdrawal, flat affect), and cognitive deficits. Life expectancy is reduced by 1…
Serotonin (5-hydroxytryptamine, 5-HT) is a monoamine neurotransmitter with a remarkable split life: ~90-95% of body serotonin is produced in the gut by enterochromaffin (EC) cells, not in the brain. This peripheral serotonin regulates intestinal motility, secretion, vis…
The serotonin-estrogen axis describes the bidirectional relationship between estrogen signaling and serotonin (5-HT) neurotransmission — a neuroendocrine interface that is profoundly modulated by the gut microbiome. Estrogen regulates serotonin synthesis (via tryptophan…
Tau is a microtubule-associated protein essential for maintaining the structural integrity of neuronal axons. In health, tau binds to and stabilizes microtubules, enabling axonal transport of organelles, vesicles, and signaling molecules. When tau becomes hyperphosphory…
Tumor necrosis factor alpha (TNF-alpha) is a master pro-inflammatory cytokine produced primarily by macrophages, along with dendritic cells, T cells, and adipocytes. With 483 mentions across 262 files, TNF-alpha is the most referenced inflammatory mediator in the WikiBi…
Tryptophan (Trp) is an essential amino acid that the human body cannot synthesize and must obtain from diet. It occupies a uniquely important position at the intersection of neuroscience, immunology, and microbial ecology because it is the sole precursor to serotonin, a…
Tryptophan (Trp) is an essential amino acid metabolized via three competing pathways: the kynurenine pathway, the serotonin pathway, and the microbial indole pathway. The balance among these pathways is profoundly influenced by the gut microbiome, inflammation, and meta…
Could counter Zn depletion, but excess Zn promotes A-beta aggregation in plaques doroszkiewicz 2023 common trace metals alzheimers parkinsons.