Divine Aleru, Microbiome Medicine Research Coordinator

This review explains how mercury form and exposure route change diagnosis and treatment. It compares blood, urine, and hair biomarkers, discusses why symptoms do not always match measured levels, and summarizes supportive care and chelation options while noting that firm treatment thresholds remain hard to define.

This review explains how workplace microbes, chemicals, metals, and air pollution can change the adult human microbiome. It highlights links to colonization, gut permeability, and immune effects, and it suggests that stopping exposure alone may not reverse risk if microbiome changes persist.

Mercury pollution reshaped a soil microbiome by lowering alpha diversity and increasing between-community divergence. A focal Pseudomonas strain survived mercury stress by acquiring mercury resistance, and conjugative elements spread merA widely across taxa, showing how toxicants can drive community change and resistance gene flow.

This study shows human gut microbiota can demethylate methylmercury and that detox rates vary by exposure level and food source. Higher Desulfovibrio and methanogen signals aligned with faster demethylation, while mer and hgcAB genes did not explain the process.

Mercury-contaminated paddy soil increased plant and human pathogen signals under both ambient and elevated CO₂. Metagenomics showed strong activation of efflux pumps, especially the RND family, alongside higher adherence and secretion-related virulence factors, linking metal exposure to antibiotic resistance potential and pathogen aggressiveness.

This study shows that trace mercury exposure can favor the USA300-LV MRSA lineage in South America. Mercury reverses the fitness cost of COMER, helps USA300-LV outcompete other strains, and increases expression of major virulence genes under sub-inhibitory mercury.

This review explains how methylmercury forms in the environment, enters the body, and reaches the brain through fast “exchange” chemistry with sulfur and selenium groups. It highlights microbial methylation as the exposure driver and selenoenzymes as vulnerable targets that amplify neurotoxicity.

This study shows mercury(II) can bind histidines to inhibit chymotrypsin and trigger irreversible denaturation and aggregation. Imidazole blocks aggregation, aggregation rises above pH 6.5, and histidine-targeting DEPC shifts mercury effects, supporting a two-histidine mechanism.

This review explains how mercury, cadmium, arsenic, and lead disrupt glutathione and cysteine-based defenses. It emphasizes catalytic mercury-driven glutathione oxidation and metal-conjugate breakdown that generates electrophiles and metal sulfides, linking these mechanisms to kidney, neurologic, and carcinogenic injury patterns.

This study shows that mussel metallothionein binds mercury in two main forms: a dominant linear Hg–thiolate complex and a substantial clustered Hg–thiolate structure with Hg–Hg pairing. The clustered form likely concentrates in the α-domain and supports cellular mercury detoxification.

This original research study used large-scale bioinformatics to map where mercury detoxification genes occur across prokaryotes and to infer how those genes evolved. The authors screened 84,032 bacterial and archaeal genomes, including isolate genomes, metagenome-assembled genomes, and single-cell genomes, for mercuric reductase (MerA), which reduces Hg(II) to volatile Hg(0), and organomercury lyase […]

This review explained how mercury cycles through air, water, and soil and how microbes control key steps that change mercury toxicity. It focused on mercury-resistant bacteria and the mer operon as a practical framework for understanding detoxification and resistance. The authors also compared physical and chemical cleanup approaches with biologic approaches, arguing […]

This review explains how mercury-tolerant bacteria, fungi, and microalgae resist and transform mercury. It highlights detox genes such as the mer system, biofilm binding, and redox-driven methylation and demethylation that change mercury toxicity and exposure risk across ecosystems.

This review explains that mercury toxicity largely comes from binding thiol groups in cysteine, glutathione, and proteins. That binding disrupts enzymes, antioxidant defenses, and signaling, driving oxidative stress, mitochondrial injury, and multi-organ effects that may also influence gut barrier stress and downstream microbiome function.

This study shows that methylmercury delivered as a cysteine complex increases liver and mitochondrial mercury uptake and worsens mitochondrial stress. Methionine pre-treatment lowers mercury uptake, preserves oxygen use, and protects mitochondrial function and cell viability in rat liver slices.

This study shows that mercury cysteine conjugates act like amino acids and directly affect sulfur metabolism enzymes. Human GTK can use and inhibit these conjugates, while cystathionine γ-lyase is irreversibly inactivated at low micromolar mercury levels, expanding how mercury can drive toxicity.

This review explains how inorganic mercury and methylmercury enter the gut, kidney, liver, brain, and placenta by binding to thiols and mimicking nutrients that use amino acid and organic anion transporters, which helps predict where mercury accumulates and how chelators enhance excretion.

This study shows that low, environmentally relevant mercury levels can boost plasmid transfer of antibiotic resistance genes between E. coli by driving oxidative stress, membrane damage, and transfer-gene activation, while very high mercury levels suppress transfer by harming cells.

This study measured mercury in urine and hair in dental workers and controls and linked urine mercury to the number of amalgam fillings. Levels stayed below occupational limits, but fillings still acted as a steady exposure source.

This review explains how inorganic and methylmercury disrupt gut microbes, metabolites, tight junctions, and immune signals, making the gut a key target tissue that can drive liver and brain toxicity through gut–liver and gut–brain pathways.

This review explains how heavy metals and microplastics work together to drive antimicrobial resistance by enriching biofilms, speeding gene transfer, and co-selecting metal and antibiotic resistance in soil and water microbiomes, creating environmental reservoirs that can feed resistant pathogens into humans.

Ferroptosis links metabolism to disease because it depends on iron handling and membrane lipid chemistry. Tumors, neurodegeneration, and organ injury models often shift ferroptosis sensitivity by changing cystine uptake, glutathione levels, GPX4 activity, and alternative antioxidant pathways such as FSP1–CoQ10.

This review explains how gut microbes influence ferroptosis in colorectal cancer through vitamins, bile acids, SCFAs, and tryptophan metabolites. It highlights microbe-linked metabolites that either sensitize tumors to ferroptosis or block it, shaping therapy response and resistance.

This review explains how gut microbiota metabolites—SCFAs, bile acids, and tryptophan products—shape ferroptosis in intestinal epithelial cells and influence IBD severity, highlighting microbial patterns linked to lower butyrate producers and altered bile acid signaling.