WikiBiomeThe human microbiome encyclopediaRanked matches across titles, topics, categories, and article introductions.
This page synthesizes findings across 1,426 source pages to map the relationships between metals and disease. Where individual source pages document a single study's findings, this page identifies the patterns that emerge when those findings are laid side by side. ADVER…
Arachidonic acid (AA) is a 20-carbon omega-6 polyunsaturated fatty acid (20:4n-6) that serves as the primary substrate for prostaglandin and leukotriene synthesis via COX-2 and 5-LOX pathways. It is the dominant pro-inflammatory lipid mediator — and its balance with ant…
Aromatase (CYP19A1) is the cytochrome P450 enzyme that catalyzes the final and rate-limiting step of estrogen biosynthesis — the conversion of androgens (testosterone, androstenedione) to estrogens (estradiol, estrone). It is expressed in the ovaries, placenta, adipose …
Aspirin (acetylsalicylic acid) is a non-steroidal anti-inflammatory drug (NSAID) that irreversibly inhibits cyclooxygenase (COX) enzymes, suppressing prostaglandin synthesis. While widely used as an antiplatelet and anti-inflammatory agent, aspirin carries significant i…
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.
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…
A synthesis of how dietary heavy metal exposure varies across the human lifespan, highlighting that the same metals present different risks at different developmental stages due to changing absorption rates, detoxification capacity, dietary patterns, and organ vulnerabi…
This page identifies the contradictions and clinical dilemmas that become visible only when the 236 source pages in this wiki are read together. Each paradox describes a situation where evidence-based dietary or supplementation advice -- advice that is correct for most …
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…
Endocrine-disrupting chemicals (EDCs) are exogenous substances that interfere with hormone synthesis, secretion, transport, binding, action, or elimination. The classical EDC list -- BPA, phthalates, dioxins, PCBs, pesticides -- is well established. What WikiBiome adds …
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…
Erectile dysfunction (ED) affects 30-50% of men aged 40-70 Feldman et al. 1994, with prevalence increasing with age. Conventionally understood as a vascular and/or neurogenic disorder, ED is now recognized as a condition with a significant gut microbiome component -- th…
The farnesoid X receptor (FXR), also known as NR1H4, is a nuclear receptor that functions as the primary bile acid sensor in the body. Activated by bile acids — especially chenodeoxycholic acid (CDCA) — FXR regulates bile acid synthesis, cholesterol metabolism, glucose …
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…
Alphabetical definitions of specialist terms used throughout this wiki. Where a full concept page exists, the term links to it. --- AhR (aryl hydrocarbon receptor) -- A ligand-activated transcription factor that senses microbial metabolites (especially indoles from tryp…
The gut-testis axis describes the bidirectional communication between the gut microbiome and the male reproductive system. Gut-derived microbial metabolites, immune signals, and systemic inflammatory mediators influence testicular function, testosterone biosynthesis, an…
Interferon gamma (IFN-γ) is the signature Th1 cytokine and the primary activator of macrophage antimicrobial functions. In the WikiBiome framework, IFN-γ is critical for two reasons: it drives nutritional immunity (iron restriction against intracellular pathogens) and i…
Indoxyl sulfate (IS) is a protein-bound uremic toxin produced through a two-step process: gut bacteria convert dietary tryptophan to indole, which is then absorbed and sulfated by hepatic sulfotransferases (SULT1A1). IS exemplifies how dysbiosis-driven metabolite overpr…
An essential halogen required for thyroid hormone synthesis (T3 and T4). The thyroid gland is the primary iodine-concentrating organ, containing 70-80% of total body iodine. Iodine occupies a unique position in the metallomics landscape: it is not a metal, but its inter…
The most abundant transition metal in the human body and arguably the most consequential metal in biology. Iron sits at the center of a paradox that drives pathology across virtually every disease domain: organisms need it for oxygen transport, energy metabolism, DNA sy…
Iron-sulfur (Fe-S) clusters are among the most ancient and ubiquitous metal cofactors in biology, present in all domains of life. These inorganic prosthetic groups -- typically [2Fe-2S] or [4Fe-4S] configurations -- mediate electron transfer, enzymatic catalysis, and re…
Lead is a purely toxic heavy metal with no known biological function. It is the most extensively studied metal in relation to neurodevelopmental harm and is increasingly recognized as a contributor to chronic disease across virtually every organ system, even at levels o…
Lipid metabolism — the synthesis, transport, and degradation of fats — is profoundly modulated by both the gut microbiome and metal homeostasis. The microbiome influences lipid metabolism through bile acid transformation, SCFA production, TMAO generation, and direct enz…
An essential macromineral required as a cofactor for over 300 enzymatic reactions in the body, including energy metabolism, protein synthesis, DNA/RNA stability, and neuromuscular function. Magnesium is not a heavy metal or trace element but is frequently measured along…
N-acetylcysteine (NAC) is the acetylated form of the amino acid L-cysteine and serves as the rate-limiting precursor for glutathione synthesis — the body's primary intracellular antioxidant and a critical cofactor for phase II detoxification of heavy metals. In the micr…
NiFe-hydrogenase (also called [Ni-Fe] hydrogenase or nickel-iron hydrogenase) is a class of enzymes that catalyze reversible hydrogen (H₂) oxidation. The active site contains both nickel (Ni) and iron (Fe) metal atoms arranged in a sophisticated bimetallic cluster. The …
Nitric oxide (NO) is a gaseous signaling molecule with roles spanning vasodilation, immune defense, neurotransmission, and gut barrier maintenance. In the microbiome context, NO sits at the intersection of host physiology and microbial metabolism — gut bacteria both pro…
A family of Gram-positive obligate anaerobes (formerly classified as the genus Oscillospira, now reclassified into Oscillibacter and related genera within Oscillospiraceae) that serve as keystone butyrate producers in the healthy human distal colonic microbiota (Konikof…
Pancreatitis is inflammation of the pancreas, occurring in acute (AP) and chronic (CP) forms. Acute pancreatitis ranges from mild self-limiting disease to severe necrotizing pancreatitis with 20-30% mortality. Chronic pancreatitis is a risk factor for pancreatic cancer …
A Gram-positive, obligate anaerobic genus that has emerged as one of the most consistently enriched taxa in colorectal cancer. The key pathogenic species P. anaerobius promotes colorectal carcinogenesis through multiple mechanisms including cholesterol biosynthesis indu…
A Gram-positive, obligate anaerobic bacterium within the Firmicutes phylum (family Peptostreptococcaceae) that has emerged as a consistently enriched organism in the colorectal cancer tumor microenvironment. While fusobacterium nucleatum receives the most attention as a…
Peptostreptococcus stomatis is a Gram-positive, obligately anaerobic coccus originally isolated from the human oral cavity (oral streptococcal species) that has emerged as a carcinogenic oral pathobiont enriched in colorectal cancer, particularly in advanced stages. Unl…
Premenstrual Dysphoric Disorder (PMDD) affects 3-8% of menstruating individuals Epperson et al. 2012, causing severe mood disturbances, irritability, anxiety, and physical symptoms during the luteal phase of the menstrual cycle. Distinguished from premenstrual syndrome …
Quorum sensing (QS) is cell-density-dependent communication in which bacteria produce, secrete, and detect small signaling molecules (autoinducers) to coordinate group behaviors — including biofilm formation, virulence factor production, siderophore synthesis, and antib…
A Gram-positive obligate anaerobe that has emerged as a pro-inflammatory pathobiont enriched across multiple disease states including crohns disease, depression, and multiple sclerosis. R. gnavus produces a species-specific inflammatory polysaccharide that activates int…
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…
Shotgun metagenomics is a sequencing approach that fragments and sequences all DNA in a sample -- bacterial, archaeal, fungal, viral, and host -- without prior amplification of a specific gene target. Unlike 16S rRNA amplicon sequencing, which identifies "who is there" …
Statins (HMG-CoA reductase inhibitors) are the most widely prescribed drug class globally, used primarily for cholesterol lowering and cardiovascular risk reduction. Over 200 million people take statins worldwide. Beyond their canonical mechanism of inhibiting cholester…
Harm potential: YELLOW — True iron deficiency anemia requires supplementation regardless of inflammatory state.
Vitamin C (ascorbate) is broadly protective: it reduces nickel absorption from food (acting as a competitive inhibitor in the GI tract), is the most commonly recommended adjunct to low-nickel diets zirwas 2009 dietary nickel dermatitis, and is a critical cofactor for DN…
Copper is elevated in the blood/serum of nearly every disease state examined in this wiki: | Disease | Cu Direction | Evidence | |---|---|---| | PCOS | Elevated | SMD = 0.51, p < 0.0001 (meta-analysis of 9 studies) | | Breast cancer | Elevated | SMD 2.44 in plasma/serum…
Fish is the primary dietary source of methylmercury (MeHg) -- a potent neurotoxin that crosses the blood-brain barrier, depletes glutathione, and can increase amyloid-beta production and tau phosphorylation mercury. MeHg is 95-100% absorbed in the intestinal tract. An e…
Celiac patients achieve serological remission on a gluten-free diet (GFD), confirming that the diet is working at the immunological level. Yet a subset develops NEW or WORSENING gastrointestinal and extraintestinal symptoms on prolonged GFD. The cause: gluten-free subst…
Iron deficiency is common and clinically significant across multiple conditions: postpartum anemia increases PPD risk 1.89-fold (RR = 1.887), low ferritin (<1 ug) increases PPD risk 3.98-fold azami 2019 anemia ppd meta analysis, iron deficiency impairs thyroid peroxidas…
Restricting dietary nickel has clear benefits for nickel-sensitive individuals: it resolves SNAS symptoms, improves Ni ACM, and even enhances H. pylori eradication. Campanale et al. (2014) found that adding a nickel-free diet to standard triple therapy increased H. pylo…
Anti-inflammatory and plant-forward diets are the standard nutritional recommendation for endometriosis, PCOS, rheumatoid arthritis, and IBD. These diets emphasize legumes, whole grains, nuts, seeds, dark chocolate, and cruciferous vegetables -- precisely the foods with…
Probiotics protect the gut barrier from heavy metal toxicity. Zhai et al. (2016) demonstrated that L. plantarum CCFM8610 protected intestinal epithelial cells from cadmium through a four-part mechanism: metal sequestration in the gut lumen, alleviation of oxidative stre…
Zinc is depleted in nearly every disease state examined in this wiki -- cancer (breast, prostate, lung, pancreatic, esophageal, colorectal), type 2 diabetes, PCOS, autism, postpartum depression, and IBD. Zinc supplementation is generally beneficial: it reduces PPD risk …
Autoimmune thyroid diseases (AITDs) -- hashimotos thyroiditis and graves disease -- are the most common organ-specific autoimmune conditions, affecting 5-10% of the global population. The thyroid gland sits at a remarkable intersection of metal biology and immune regula…
A gut microbiome-derived metabolite that has emerged as one of the strongest microbial biomarkers for cardiovascular disease risk. TMAO exemplifies how microbial metabolism of dietary nutrients can generate systemically toxic products -- a fundamentally different paradi…
Tryptamine is a microbial decarboxylation product of tryptophan, produced by bacterial tryptophan decarboxylase (found in ruminococcus gnavus, Clostridium sporogenes, and others). It is a serotonin receptor agonist (particularly 5-HT4) that stimulates gut motility and f…
Vitamin B12 (cobalamin) is an essential cobalt-containing cofactor required for homocysteine metabolism, methylation reactions, and neurological function. Its core corrin ring chelates a cobalt ion, placing B12 at the intersection of metallomics and microbial ecology. C…