Mechanisms4 sources
Microbiome Diversity Metrics (Alpha and Beta Diversity)
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Search: “microbiome”
Ranked matches across titles, topics, categories, and article introductions, filtered to mechanism.
80 records in this view
Mechanisms7 sources
Microbiome-Derived Metabolites
Small molecules produced, modified, or activated by gut microbiota that function as the primary chemical language between the microbiome and its host. These metabolites are not passive byproducts — they regulate gene expression, immune cell differentiation, gut barrier …
Mechanisms8 sources
Dietary Metal-Microbiome Interactions
Every meal delivers metals to the gut lumen — essential minerals, trace elements, and contaminants alike. These metals do not passively transit the GI tract. They actively reshape the microbial ecosystem, selecting for metal-tolerant organisms, enabling virulence in met…
Mechanisms8 sources
Gut Microbiome
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…
Mechanisms22 sources
Gut-Metal-Microbiome Interactions
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Mechanisms8 sources
Oral Microbiome
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Mechanisms3 sources
Semen Microbiome
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Mechanisms6 sources
16S rRNA Sequencing
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Mechanisms5 sources
AhR (Aryl Hydrocarbon Receptor)
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor that functions as a master sensor at the intersection of gut microbial metabolism, environmental chemical exposure, and immune regulation. It is expressed broadly across immune cells, intesti…
Mechanisms5 sources
Allopregnanolone
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Mechanisms3 sources
Alpha-Klotho
An anti-aging protein that has emerged as a critical mediator between heavy metal exposure and chronic kidney disease progression. Originally discovered as a gene whose mutation caused premature aging in mice, alpha-klotho is now understood to be a multifunctional prote…
Mechanisms7 sources
Alpha-Synuclein
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…
Mechanisms7 sources
Amyloid-Beta
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…
Mechanisms8 sources
Amyloid-Beta Aggregation
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…
Mechanisms7 sources
Antimicrobial Resistance
The ability of microorganisms to survive and replicate in the presence of antimicrobial agents — antibiotics, antifungals, antivirals, antiparasitic drugs — at concentrations that would normally inhibit or kill them. Antimicrobial resistance (AMR) is designated by the W…
Mechanisms5 sources
Arachidonic Acid
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Mechanisms5 sources
Aromatase
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Mechanisms8 sources
Aryl Hydrocarbon Receptor (AhR)
This page serves as a cross-reference point for the existing ahr concept page, which provides comprehensive coverage of AhR signaling, microbiome-derived ligands, and immune regulation. The aryl hydrocarbon receptor is a ligand-activated transcription factor that integr…
Mechanisms3 sources
Atherosclerosis
Progressive inflammatory disease of the arterial wall characterized by lipid accumulation, immune cell infiltration, and fibrous plaque formation. In the metallomics framework, atherosclerosis sits at the convergence of three interacting systems: heavy metal toxicity, g…
Mechanisms8 sources
Autophagy
Autophagy (from Greek, "self-eating") is the cellular process of degrading and recycling damaged organelles, misfolded proteins, and intracellular pathogens through lysosomal digestion. It is the cell's primary quality control mechanism -- a housekeeping system that bec…
Mechanisms11 sources
Bacterial Contamination Hypothesis
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Mechanisms3 sources
Bacterial Vaginosis
Bacterial vaginosis (BV) is the most common vaginal infection in women of reproductive age, affecting an estimated 29% of women globally. Rather than an infection by a single pathogen, BV represents a polymicrobial dysbiotic state -- a collapse of the protective Lactoba…
Mechanisms14 sources
Bacteriophages
Viruses that exclusively infect bacteria. Bacteriophages -- phages for short -- are the most abundant biological entities on Earth, outnumbering bacteria in most environments by ratios of 1:1 to 10:1. In the human gut, the phageome represents a powerful but underexplore…
Mechanisms4 sources
BDNF (Brain-Derived Neurotrophic Factor)
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Mechanisms8 sources
Bile Acid Metabolism
Bile acids are cholesterol-derived amphipathic molecules synthesized in the liver, secreted into the duodenum, and extensively modified by gut bacteria. The host-microbe co-metabolism of bile acids creates a signaling network with profound effects on lipid metabolism, g…
Mechanisms3 sources
Biomarkers
Measurable indicators of biological state, exposure, or disease. In the metallomics context, biomarkers span three interconnected domains: metal biomarkers (quantifying exposure and body burden), microbiome biomarkers (reflecting microbial community disruption), and met…
Mechanisms3 sources
Blood-Brain Barrier
A selective semipermeable border formed by brain endothelial cells connected by tight junctions, pericytes, and astrocytic end-feet. The BBB restricts passage of most molecules from blood to brain, protecting the CNS from toxins, pathogens, and inflammatory mediators. M…
Mechanisms3 sources
Cephalosporins
Cephalosporins are a class of beta-lactam antibiotics (five generations) that inhibit bacterial cell wall synthesis by binding penicillin-binding proteins. They are among the most prescribed antibiotic classes and among the most disruptive to the gut microbiome.
Mechanisms3 sources
Chelation Therapy
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Mechanisms3 sources
Colonization Resistance
The collective ability of the resident gut microbiome to prevent colonization by exogenous pathogens and suppress expansion of resident pathobionts. Colonization resistance is not a property of any single organism but an emergent function of the whole microbial communit…
Mechanisms3 sources
Comorbidities
The co-occurrence of multiple diseases in the same individual at rates exceeding chance. Comorbidity patterns are a central puzzle in medicine -- why do IBD patients develop CVD? Why does PCOS cluster with T2D? Why do neurodegenerative diseases associate with depression…
Mechanisms5 sources
Cortisol
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Mechanisms6 sources
COX-2 (Cyclooxygenase-2)
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Mechanisms4 sources
Cross-Feeding
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Mechanisms4 sources
Cuproptosis
A distinct form of regulated cell death caused by excess intracellular copper binding to lipoylated proteins in the TCA cycle, first characterized by Tsvetkov et al. in Science (2022). Unlike ferroptosis (iron-dependent lipid peroxidation) or apoptosis (caspase-dependen…
Mechanisms4 sources
Dental Caries
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Mechanisms20 sources
Developmental Metal Vulnerability: Critical Windows of Susceptibility
This page unifies the infant formula contamination, pregnancy complications, autism spectrum disorder, necrotizing enterocolitis, and neurodevelopmental toxicity threads around a single organizing insight: metal toxicity is disproportionately severe during specific deve…
Mechanisms6 sources
Dietary Arsenic Exposure
arsenic (As) is unique among dietary heavy metals because it exists in two fundamentally different forms with dramatically different toxicities: inorganic arsenic (iAs, the dangerous form) and organic arsenic (arsenobetaine, arsenosugars — largely non-toxic). Understand…
Mechanisms6 sources
Dietary Cadmium Exposure
cadmium (Cd) enters the human body primarily through food. Unlike nickel, which has high-concentration food categories that can be avoided, cadmium contamination is diffuse — embedded in staple crops, leafy greens, and grains that form the basis of most dietary patterns…
Mechanisms5 sources
Dietary Lead Exposure
lead (Pb) has no safe level of exposure. Unlike most dietary metals, lead does not play any known biological role — every atom absorbed represents toxic burden. While environmental lead exposure (paint, soil, air) has decreased dramatically since leaded gasoline phase-o…
Mechanisms5 sources
Drug Repurposing
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Mechanisms14 sources
Dysbiosis
Disruption of the normal composition and metabolic function of microbial communities, particularly the gut microbiome. In the metallomics context, dysbiosis is both a consequence of metal toxicity and an amplifier of further disease -- creating vicious cycles where meta…
Mechanisms6 sources
Dysmenorrhea
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Mechanisms8 sources
EDTA
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Mechanisms3 sources
Efflux Pumps
Membrane-spanning protein complexes that actively export substrates from the bacterial cell, using energy from ATP hydrolysis or the proton motive force. In the context of metal-microbiome biology, efflux pumps serve a dual role that has profound clinical consequences: …
Mechanisms5 sources
Endocrine Disruption
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Mechanisms8 sources
Endocrine Disruptors
Exogenous chemicals that interfere with hormone synthesis, secretion, transport, binding, or elimination, mimicking or blocking endogenous hormones at physiologically relevant concentrations. In the metallomics-microbiome framework, endocrine disruptors occupy a critica…
Mechanisms6 sources
Endothelial Dysfunction
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Mechanisms9 sources
Endotoxemia
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Mechanisms6 sources
Epigenetic Modifications
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Mechanisms10 sources
Epigenetics
Epigenetics is the study of heritable changes in gene expression that occur without alterations to the DNA sequence itself. These changes -- primarily DNA methylation, histone modifications, and non-coding RNA regulation -- represent a molecular memory system that can b…
Mechanisms8 sources
Epithelial-Mesenchymal Transition
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Mechanisms3 sources
Essential Oils
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Mechanisms4 sources
Estrobolome
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Mechanisms8 sources
Farnesoid X Receptor (FXR)
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Mechanisms4 sources
Fecal Microbiota Transplant (FMT)
The transfer of processed stool from a healthy donor into a recipient's gastrointestinal tract to restore a disrupted microbial community. FMT is the most direct form of microbiome intervention -- replacing the entire community rather than supplementing individual strai…
Mechanisms10 sources
Gut Barrier Dysfunction
Gut barrier dysfunction -- colloquially "leaky gut" -- is the pathological increase in intestinal permeability that permits translocation of bacteria, bacterial products (LPS, peptidoglycan), metals, and dietary antigens from the gut lumen into the systemic circulation.…
Mechanisms16 sources
Gut-Brain Axis
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…
Mechanisms8 sources
Gut-Gonadal Axis
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Mechanisms8 sources
Gut-Kidney Axis
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Mechanisms3 sources
Gut-Penis Axis
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Mechanisms3 sources
Gut-Thyroid Axis
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Mechanisms5 sources
Gut-Vagina Axis
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Mechanisms3 sources
Heavy Metal Neurotoxicity
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…
Mechanisms3 sources
Heavy Metals
An umbrella term for metallic elements with relatively high density (conventionally 5 g/cm3), many of which are toxic to biological systems at low concentrations. This wiki uses "heavy metals" broadly to encompass both strictly toxic metals and essential trace metals th…
Mechanisms5 sources
Homocysteine
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Mechanisms4 sources
Human Milk Oligosaccharides (HMOs)
Human milk oligosaccharides are a diverse family of over 200 structurally distinct complex sugars found in breast milk. They are the third most abundant solid component of human milk (after lactose and lipids), yet they are not digestible by the infant. Their sole purpo…
Mechanisms3 sources
Hyperandrogenism
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Mechanisms6 sources
Hyperparathyroidism
Hyperparathyroidism is the overproduction of parathyroid hormone (PTH), a master regulator of calcium homeostasis. While primary hyperparathyroidism (from parathyroid adenoma) is well described, the WikiBiome framework highlights secondary hyperparathyroidism -- the com…
Mechanisms5 sources
IL-10 (Interleukin-10)
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Mechanisms4 sources
IL-17 (Interleukin-17)
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Mechanisms5 sources
IL-1beta (Interleukin-1 Beta)
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Mechanisms9 sources
Immune Balance
The immune system is not a monolith but a dynamic equilibrium between pro-inflammatory effector responses (Th1, Th2, Th17) and anti-inflammatory regulatory responses (Treg, IL-10, TGF-beta). Metals and the microbiome are two of the most potent environmental modulators o…
Mechanisms3 sources
Immunotherapy
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Mechanisms4 sources
Indoles
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…
Mechanisms4 sources
Infant Exposure
The developing infant represents a uniquely vulnerable window for heavy metal toxicity. Three factors converge to make the first years of life a critical period: an immature and rapidly assembling gut microbiome, a developing blood-brain barrier, and proportionally high…
Mechanisms13 sources
Interleukin-6 (IL-6)
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…
Mechanisms8 sources
Intestinal Permeability
The intestinal epithelium is a single-cell-thick barrier separating the lumen -- home to trillions of microbes and ingested metals -- from the systemic circulation. When this barrier fails, the consequences cascade: microbial products translocate, metals gain unrestrict…
Mechanisms5 sources
Isoflavones
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Mechanisms3 sources
Ketone Bodies
Ketone bodies (beta-hydroxybutyrate [BHB], acetoacetate, acetone) are produced by hepatic fatty acid oxidation during carbohydrate restriction, fasting, or ketogenic diet consumption. BHB is the most abundant and is structurally and functionally analogous to butyrate — …