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CNTLN (Centlein): CNTLN is a protein involved in centrosome function, essential for proper cell division. It plays a key role in maintaining centrosome integrity and spindle assembly during mitosis. Dysfunction of CNTLN can lead to chromosomal instability, a characteristic of cancer cells, making it important in the study of tumour development and progression.

HERC2 (HECT and RLD Domain Containing E3 Ubiquitin Protein Ligase 2): HERC2 is an E3 ubiquitin-protein ligase that plays a crucial role in the ubiquitin–proteasome system, which governs protein degradation. It is involved in various cellular processes, including DNA repair and pigment production, particularly influencing eye colour. Variations in HERC2 are associated with neurodevelopmental disorders and pigmentary abnormalities.

CCR2 (C-C Motif Chemokine Receptor 2): CCR2 is a receptor that binds chemokines, including CCL8. It is primarily expressed on immune cells and plays a key role in guiding their migration to sites of inflammation. CCR2 is important for the immune response against infections and has been extensively studied in the context of inflammatory diseases, cancer, and HIV infection.

ACVR1 (Activin Receptor Type 1) is a gene that encodes a receptor for activin, a protein involved in regulating cell growth and differentiation. This receptor plays a key role in signalling pathways that control how cells proliferate and develop. Mutations in ACVR1 are linked to fibrodysplasia ossificans progressiva (FOP), a rare genetic disorder characterised by abnormal bone formation in soft tissues.

NCOR1 (Nuclear Receptor Corepressor 1) is a protein that plays a key role in regulating gene expression and transcriptional repression. Located mainly in the cell nucleus, NCOR1 modulates the activity of nuclear receptors and other transcription factors. It functions as a corepressor for receptors such as thyroid hormone receptors (TRs), retinoic acid receptors (RARs), and peroxisome proliferator-activated receptors (PPARs). By recruiting histone deacetylases (HDACs) and other chromatin-modifying enzymes, NCOR1 helps form repressive chromatin structures, leading to reduced gene transcription.

FHOD3 (Formin Homology 2 Domain Containing 3): FHOD3 is a protein belonging to the formin family, which plays a key role in organising and regulating the actin cytoskeleton. It is especially important in cardiac muscle and other tissues, where it supports the assembly of actin filaments that affect cell shape, adhesion, and movement. FHOD3 is vital for processes like cell division, migration, and muscle contraction, contributing to cardiovascular and skeletal system function. Its regulatory role involves dynamic remodelling of the actin cytoskeleton, essential for heart development and performance.

NBPF3 (Neuroblastoma Breakpoint Family, Member 3): NBPF3 is a gene belonging to the neuroblastoma breakpoint family, with functions that are not yet fully understood. It may contribute to neurological development or function and could be associated with the development of neuroblastoma, a childhood cancer.

XDH, or Xanthine dehydrogenase, is an enzyme that plays a crucial role in purine metabolism, which involves the breakdown and recycling of purine nucleotides such as adenine and guanine. XDH catalyses the conversion of hypoxanthine to xanthine, and then xanthine to uric acid, the final product of purine degradation in humans. This process is essential for eliminating excess purines from the body, helping to regulate levels derived from both diet and cellular turnover.

ADAM17 (A Disintegrin and Metalloproteinase 17) is an enzyme that regulates the release of membrane-bound proteins, such as growth factors, cytokines, and receptors. It plays a crucial role in cell signalling, inflammation, and tissue remodelling, and its dysregulation has been linked to conditions including arthritis, cancer, and cardiovascular disease.

DPEP1 (Dipeptidase 1): DPEP1 is involved in the hydrolysis of dipeptides and plays a role in detoxification processes, particularly in the kidneys. It participates in the metabolism of glutathione and leukotrienes, which are important for cellular redox balance and inflammation. Variations in DPEP1 activity can affect drug metabolism and the body's response to inflammatory stimuli. Research on DPEP1 focuses on its effects on kidney function, blood pressure, and inflammatory diseases.

Pears are sweet and juicy fruits enjoyed for their delicious flavour and nutritional benefits. However, some individuals may experience pear intolerance, which affects their ability to digest the fruit comfortably.

3-Hydroxykynurenine (3-OH-kynurenine) is a metabolite in the kynurenine pathway, which reflects the breakdown of the amino acid tryptophan. It serves as an intermediate compound during the conversion of tryptophan into important molecules, including the essential coenzyme NAD+ (nicotinamide adenine dinucleotide).

SH2B1 (SH2B Adaptor Protein 1): SH2B1 is a gene that encodes an adaptor protein involved in multiple intracellular signalling pathways, particularly those linked to insulin and leptin. It plays a key role in regulating energy balance, body weight, and glucose metabolism. Variations in SH2B1 have been associated with obesity and insulin resistance.

POLM (DNA Polymerase Mu): POLM is a gene that encodes a DNA polymerase enzyme involved in DNA repair, particularly in the non-homologous end joining (NHEJ) pathway. It plays an important role in maintaining genomic stability and preventing mutations. Mutations in POLM may increase the risk of genomic instability and cancer.

PTGER3 (Prostaglandin E Receptor 3): PTGER3 is a gene that encodes one of the four receptors for prostaglandin E2, a lipid compound involved in various physiological processes such as inflammation, gastric mucosal protection, and smooth muscle function. This receptor plays a key role in mediating cellular responses to prostaglandin E2, affecting pain perception, fever response, and may contribute to cancer progression and inflammatory diseases.

GNB3: GNB3 is a gene that encodes a subunit of G proteins, which help transmit signals from outside the cell to the inside. A well-known variant (C825T) has been linked to traits such as hypertension and obesity, making GNB3 important in studying disease risk and individual responses to medications.

HS3ST4 (Heparan Sulfate-Glucosamine 3-Sulfotransferase 4): HS3ST4 is an enzyme involved in modifying heparan sulphate, a key component of the extracellular matrix. This modification plays an important role in cell signalling and blood coagulation. Dysregulation of HS3ST4 can affect cellular interactions and may have implications in cancer and vascular disorders.

ILRUN, also known as interleukin-like RUN domain-containing protein, is a recently identified protein that plays a role in immune regulation. Located within the cytoplasm, ILRUN contains a RUN domain, which facilitates protein-protein interactions. Although its precise function is still under investigation, ILRUN is thought to modulate immune responses, potentially influencing cytokine production, immune cell activation, and inflammatory processes. It has also been proposed as a potential biomarker for certain immune-related or inflammatory conditions.

POLK (DNA Polymerase Kappa): POLK is a gene that encodes a member of the Y-family DNA polymerases involved in translesion DNA synthesis. This process enables DNA replication to proceed past damaged sites, such as UV-induced lesions or bulky chemical adducts. POLK helps maintain genome stability by preventing replication fork stalling but can also introduce mutations due to its error-prone nature, making it important in DNA repair and mutagenesis.

Pike-perch, also known as zander, is a popular freshwater fish recognised for its mild and delicate flavour. While many people enjoy it without any problems, some individuals may have a pike-perch intolerance, which can affect their ability to digest the fish comfortably.

DNMT3B (DNA Methyltransferase 3 Beta) is a gene that encodes an enzyme involved in DNA methylation — a crucial epigenetic mechanism that regulates gene expression. DNMT3B plays a vital role in development and has been associated with conditions such as ICF syndrome and various types of cancer.

hCG (human chorionic gonadotropin) is a hormone produced by the placenta during pregnancy. It plays a vital role in supporting the corpus luteum, which produces progesterone to maintain the uterine lining for the developing embryo. hCG also helps prevent the degeneration of the corpus luteum, ensuring continued progesterone production.

CNDP2 (Carnosine Dipeptidase 2): CNDP2 is an enzyme closely related to CNDP1 that is involved in the metabolism of carnosine and anserine. Although its function and significance are less well understood than those of CNDP1, CNDP2 is thought to play a role in muscle and brain health. Ongoing research into CNDP2 may provide new insights into metabolic health and disease.

Yeast intolerance is a condition that reflects the body’s reduced ability to digest yeast, often leading to gastrointestinal discomfort. This differs from a yeast allergy, which triggers an immune response and may cause more severe symptoms. People with yeast intolerance typically experience digestive issues after consuming yeast or yeast-containing foods.

BIN1 (Bridging Integrator 1): BIN1 is a protein that plays a crucial role in regulating cellular membrane dynamics. It is involved in key processes such as endocytosis and shaping membrane curvature. BIN1 acts as a bridging factor, aiding in the formation of membrane tubules that are essential for various cellular functions.

HLCS (Holocarboxylase Synthetase): HLCS is an enzyme essential for the proper functioning of carboxylase enzymes, which play key roles in protein, carbohydrate, and lipid metabolism. Mutations in HLCS can cause holocarboxylase synthetase deficiency, a rare metabolic disorder characterised by multiple carboxylase deficiencies, leading to issues with skin, hair, immune function, and developmental delays.

Cream cheese intolerance is a condition that reflects the body’s reduced ability to digest cream cheese, a dairy product valued for its creamy, spreadable texture. It typically causes gastrointestinal discomfort rather than triggering an immune response, which distinguishes it from a cream cheese allergy. People with this intolerance often experience digestive symptoms after consuming cream cheese or foods containing it.

PHYHIPL (Phytanoyl-CoA 2-Hydroxylase Interacting Protein-Like): PHYHIPL is a protein associated with the peroxisomal degradation pathway, particularly involved in the metabolism of branched-chain fatty acids and bile acid intermediates. It contributes to lipid metabolism and the maintenance of cellular lipid homeostasis. Although its exact functions are still being defined, PHYHIPL may play a role in metabolic disorders linked to defective lipid processing.

Shrimp allergy is a common shellfish allergy caused by an immune reaction to proteins found in shrimp. It is one of the most frequent food allergies in adults and can trigger symptoms ranging from mild to severe, including anaphylaxis. This allergy is usually lifelong and may be triggered by consuming shrimp or even inhaling steam during cooking.

DOK6 (Docking Protein 6) is a member of the DOK protein family that acts as a substrate and regulator of tyrosine kinases. It plays a crucial role in signalling pathways involved in nerve cell growth, differentiation, and function, with potential implications for neurological disorders.

LINGO2 (Leucine-Rich Repeat And Ig Domain-Containing 2): LINGO2 is a gene involved in neuronal development and function. It is believed to play a role in axon growth and myelination. Dysregulation of LINGO2 has been linked to neurological disorders such as Parkinson’s disease and essential tremor.

MSTN (Myostatin): MSTN is a protein that acts as a negative regulator of muscle growth and development. Reducing or inhibiting myostatin activity can result in increased muscle mass and strength, making MSTN a central focus in research on enhancing muscle growth and treating muscle-wasting conditions.

ZBTB49 (Zinc Finger and BTB Domain Containing 49) is a transcription factor involved in regulating gene expression through DNA binding and chromatin remodelling. As a member of the ZBTB family, it contributes to key cellular processes such as proliferation, differentiation, and development. Although the specific functions of ZBTB49 are not fully understood, its role in transcriptional regulation suggests it may influence cell fate decisions and could have important implications for cancer and developmental disorders.

OSR1 (Odd-Skipped Related 1): OSR1 is a transcription factor gene that plays a key role in embryonic development, particularly in the formation of the heart and urogenital system. Proper regulation of OSR1 is essential, as mutations or dysregulation can lead to developmental abnormalities. Research on OSR1 is important for understanding congenital defects and developmental biology.

The cholesterol-to-HDL (Chol:HDL) ratio is a measure that reflects the balance between total cholesterol and high-density lipoprotein (HDL) cholesterol in the blood. This ratio is used to assess the risk of heart disease, with a lower ratio indicating a healthier balance and a reduced risk. It is often considered a more accurate indicator of cardiovascular health than total cholesterol levels alone.

FZD1 (Frizzled Class Receptor 1): FZD1 is a member of the frizzled receptor family, which are key components of the Wnt signalling pathway. This pathway plays a central role in development, tissue regeneration, and cancer progression. As a Wnt receptor, FZD1 helps regulate cellular responses to Wnt ligands, influencing important biological processes and holding potential implications in disease mechanisms.

Hookworms are parasitic worms that inhabit the small intestine and feed on the host’s blood. They are commonly found in areas with poor sanitation and can cause anaemia, protein deficiency, abdominal pain, diarrhoea, and fatigue. Infection typically occurs through skin contact with soil contaminated by hookworm larvae.

BHMT2 (Betaine-Homocysteine S-Methyltransferase 2) is a gene involved in homocysteine metabolism, functioning similarly to its counterpart, BHMT. It aids in the conversion of homocysteine to methionine, a process essential for cardiovascular and neurological health. Although it has been studied less extensively than BHMT, BHMT2 affects homocysteine levels in the body, which may influence heart function and neurological disorders. Understanding the role of BHMT2 can offer insights into its impact on metabolic pathways and disease risk.

FANCI (FA Complementation Group I): FANCI is a key protein in the Fanconi anaemia (FA) pathway, essential for DNA repair. It plays a vital role in responding to DNA damage and maintaining genomic stability. Mutations in FANCI can lead to Fanconi anaemia, a disorder marked by bone marrow failure, increased cancer risk, and developmental abnormalities.

Enterobacter is a genus of bacteria commonly found in the human gut. Usually harmless, these bacteria are part of the natural gut flora and contribute to digestive health. However, an overgrowth of Enterobacter can indicate or lead to health problems. Monitoring Enterobacter levels in stool can provide important insights into gut health and assist in diagnosing various conditions.

PRDM8 (PR/SET Domain 8): PRDM8 is a transcription factor involved in neurodevelopment, particularly in the differentiation and function of neurones. It plays a role in the development of the central nervous system and has been linked to neural disorders.

LMNB1 (Lamin B1): LMNB1 is a gene that encodes Lamin B1, a key component of the nuclear lamina — a fibrous layer that supports the inner nuclear membrane. Lamin B1 plays important roles in DNA replication, chromatin organisation, and gene expression regulation. Changes in LMNB1 expression or mutations have been linked to developmental disorders and diseases, including laminopathies and premature ageing syndromes.

CARMIL1 (Capping Protein Regulator and Myosin 1 Linker 1): CARMIL1 is a gene that encodes a protein involved in regulating actin dynamics, a crucial component of the cellular cytoskeleton. It plays a significant role in cell movement, structure, and signalling. Alterations or disruptions in CARMIL1 can affect cell motility and have been linked to immune system disorders and certain cancers.

Ric3 (Resistance To Inhibitors Of Cholinesterase 3 Homolog): Ric3 is a protein involved in the maturation and trafficking of nicotinic acetylcholine receptors, which are essential for neuronal signalling. Ric3 plays a key role in the development and maintenance of the nervous system, and alterations in its function can have implications for neurological diseases.

FGF5 (Fibroblast Growth Factor 5): FGF5 is a gene that encodes a protein from the fibroblast growth factor family, which is involved in cell growth, differentiation and signalling. FGF5 regulates hair growth cycles and influences hair length across species. It also contributes to tissue development and repair, including roles in neural development. Abnormal FGF5 activity has been linked to certain diseases, including cancer.

REX1BD (REX1 Basic Domain): REX1BD is a gene region characterised by a basic domain that may contribute to DNA binding or protein–protein interactions. While its exact functions and roles in cellular processes are not yet fully understood, ongoing research aims to clarify its significance in biological systems.

OVOL1 (Ovo Like Transcriptional Repressor 1): OVOL1 is a gene that encodes a transcriptional repressor involved in regulating gene expression during development and tissue differentiation. It plays a role in epithelial cell differentiation and the formation of tissue barriers.

OR13F1 (Olfactory Receptor, Family 13, Subfamily F, Member 1): OR13F1 is a protein that belongs to the olfactory receptor gene family—a group of G protein-coupled receptors involved in detecting odours. These receptors are found in the olfactory epithelium, where they bind specific odour molecules and trigger signalling pathways that result in the perception of smell. While the exact ligands and functions of OR13F1 are not yet fully understood, it plays a role in our sense of smell and may also be involved in pheromone detection.

The TYMS gene encodes thymidylate synthase, a key enzyme involved in the synthesis of thymidine, one of the four nucleotides necessary for DNA replication and repair. This enzyme depends on active folate (5,10-methylene-THF) to work effectively, closely linking TYMS to folate metabolism. Variations in the TYMS gene can influence folate availability at the cellular level and may modify the body's response to folate or folate-based treatments. Such alterations may contribute to disrupted DNA synthesis, increased vulnerability to certain diseases, or differing responses to chemotherapy or supplementation.

Trimethylamine N-oxide (TMAO) is a compound produced in the liver from trimethylamine (TMA), which is generated by gut bacteria during the digestion of nutrients such as choline, L-carnitine, and phosphatidylcholine. Elevated levels of TMAO have been associated with an increased risk of cardiovascular disease, kidney dysfunction, and inflammation. TMAO serves as a valuable marker for assessing metabolic health and the influence of gut microbiota on systemic disease risk. Lifestyle and diet, particularly red meat and eggs, can significantly affect TMAO levels. Monitoring TMAO may help identify hidden risks even when other conventional markers appear normal.

Trimethylamine (TMA) is a volatile organic compound produced in the gut through bacterial fermentation of dietary nutrients such as choline, L-carnitine, and lecithin. Typically, TMA is rapidly converted in the liver to trimethylamine N-oxide (TMAO), which is less toxic. However, elevated TMA levels can indicate imbalances in the gut microbiome or impaired liver detoxification capacity. High TMA is also linked to trimethylaminuria, a rare metabolic disorder that causes a strong body odour. Monitoring TMA provides insight into gut microbial activity, protein metabolism, and liver function.

Transferrin is a blood protein responsible for binding and transporting iron throughout the body. It plays a key role in maintaining iron balance by delivering iron to tissues and storing excess iron in a safe form. Levels of transferrin typically rise when iron stores are low and decrease when iron stores are high or in cases of chronic illness. Measuring transferrin helps provide important insights into iron metabolism and related disorders.

Total bile acids represent the combined concentration of all bile acids circulating in the bloodstream. They are synthesised in the liver from cholesterol and have a central role in the digestion of fats, nutrient absorption, and detoxification. Elevated total bile acid levels may indicate reduced bile flow, liver dysfunction, or impaired reabsorption in the intestine. Normal concentrations suggest balanced bile acid synthesis and efficient hepatic and intestinal function.

Trimethylamine (TMA) is a metabolite produced by gut bacteria during the breakdown of choline, carnitine, and lecithin—nutrients commonly found in meat, eggs, and dairy. In the liver, TMA is converted into Trimethylamine N-oxide (TMAO), a compound that has been linked to cardiovascular risk in several studies. Elevated TMA/TMAO levels may reflect high microbial conversion activity in the gut, imbalanced microbiota, or a diet rich in animal-based products. While research is ongoing, high TMAO has been associated with inflammation and impaired cholesterol metabolism. Balanced gut flora and plant-forward diets may help maintain healthy TMAO levels.

Tertiary bile acids are secondary bile acids that have undergone further modification in the liver, such as ursodeoxycholic acid (UDCA). They are generally considered less cytotoxic and may have protective, anti-inflammatory effects on the liver and bile ducts. Elevated tertiary bile acids can indicate adaptive responses to oxidative or metabolic stress. Adequate levels reflect efficient bile acid recycling and hepatobiliary balance.

The TCN2 gene encodes transcobalamin II, a protein responsible for transporting vitamin B12 (cobalamin) from the bloodstream into cells. Once vitamin B12 is absorbed in the gut, it must bind to transcobalamin to be delivered to tissues where it is used for DNA synthesis, red blood cell formation, and neurological function. Genetic variations in TCN2 can reduce the efficiency of B12 transport, potentially leading to functional B12 deficiency even when blood levels appear normal. This may contribute to symptoms such as fatigue, cognitive changes, or elevated homocysteine.

TCN1 encodes the protein haptocorrin, also known as transcobalamin I, which binds vitamin B12 (cobalamin) in the saliva and protects it from degradation in the acidic environment of the stomach. This initial binding allows B12 to reach the small intestine, where it is then transferred to intrinsic factor for absorption. Variants in the TCN1 gene may affect the stability or availability of B12 in the digestive tract, potentially contributing to suboptimal B12 status. Although not directly involved in cellular B12 transport like TCN2, TCN1 plays a critical early role in vitamin B12 handling.

Swede (also known as rutabaga or yellow turnip) is a root vegetable that belongs to the brassica family, closely related to cabbage and turnips. It has a round shape, yellowish flesh, and a slightly sweet, earthy flavour that becomes mellow when cooked. Swede is often used in soups, stews, mashes, or roasted as a hearty side dish. It is especially popular in Northern European cuisine and provides a good source of fibre, vitamin C, and antioxidants. The vegetable is known for its resilience and long storage life, making it a staple in colder climates.

Spermine is a polyamine derived from spermidine that plays a vital role in stabilising DNA, RNA, and cellular membranes. It contributes to antioxidant defence, inflammation control, and the regulation of cellular ageing. Elevated levels can occur during high metabolic or regenerative activity, while low levels may reflect reduced polyamine synthesis or increased cellular stress. Balanced spermine levels support optimal cellular integrity and protection against premature ageing.

Spermidine is a naturally occurring polyamine involved in cellular growth, repair, and protection. It supports autophagy — the body’s natural process of clearing damaged cells — and contributes to mitochondrial function and longevity pathways. Higher levels are often associated with enhanced cellular renewal and resilience against oxidative stress. Low concentrations may indicate reduced cell turnover, nutritional insufficiency, or increased oxidative demands.

The SLC19A1 gene encodes the reduced folate carrier 1 (RFC1), a key transporter responsible for moving folate and folate derivatives into cells. This transport system is essential for cellular uptake of folate, which is necessary for DNA synthesis, repair, methylation processes, and red blood cell production. Variants in this gene may impair folate transport, potentially resulting in reduced intracellular folate levels even when dietary intake is adequate. Such dysfunctions have been associated with developmental problems, fatigue, cognitive issues, and increased homocysteine levels.

Sex hormone-binding globulin (SHBG) is a glycoprotein produced principally by the liver that binds to and transports sex steroids—mainly testosterone and oestradiol—in the bloodstream. By binding these hormones, SHBG regulates the amount that is biologically available to tissues. Higher SHBG generally reduces the free (unbound) fraction of testosterone and oestradiol, while lower SHBG increases it. Due to this buffering role, SHBG is a key determinant of hormonal balance in both men and women and is commonly measured alongside total testosterone and oestradiol to assist with interpretation.

Secondary bile acids are produced in the colon through the bacterial conversion of primary bile acids, which are originally synthesised in the liver. While they contribute to digestion and regulation of the microbiota, elevated levels may indicate dysbiosis, excessive fat consumption, or altered bile acid metabolism. Certain secondary bile acids, such as deoxycholic acid (DCA) and lithocholic acid (LCA), have been linked to mucosal irritation, inflammation, and a higher risk of colorectal disorders when persistently raised. Measuring them in stool samples aids in evaluating gut microbial activity and the status of bile detoxification.

SDMA is a methylated derivative of the amino acid arginine and is primarily excreted by the kidneys. Unlike ADMA, SDMA does not directly inhibit nitric oxide synthase but reflects similar metabolic and renal processes. Elevated SDMA levels can indicate reduced kidney clearance or altered amino acid metabolism. Stable or optimal SDMA values suggest efficient renal function and normal arginine turnover.

Ruminococcus spp. are a group of anaerobic bacteria within the Firmicutes phylum, commonly found in the human gut microbiota. They play a significant role in the fermentation of complex carbohydrates and the production of short-chain fatty acids such as acetate and butyrate, which support gut health and energy metabolism. Ruminococcus species are considered important for maintaining a balanced gut environment, particularly due to their fibre-degrading capabilities. Altered levels of Ruminococcus have been linked to digestive issues, irritable bowel syndrome (IBS), and metabolic disorders.

Roseburia spp. are beneficial, anaerobic bacteria belonging to the Firmicutes phylum and are common residents of the healthy human gut. These bacteria are recognised for their ability to produce butyrate, a short-chain fatty acid that serves as a vital energy source for colonocytes and helps to reduce inflammation in the gut. A well-balanced level of Roseburia is often associated with better metabolic health, improved gut barrier function, and a lower risk of inflammatory disorders. Decreased levels have been linked to conditions such as obesity, type 2 diabetes, and inflammatory bowel disease.

Putrescine is a biogenic amine produced through the bacterial and cellular breakdown of the amino acid ornithine. It is involved in cell growth, tissue regeneration, and the regulation of intestinal function. Elevated putrescine levels can occur due to increased microbial fermentation, protein degradation, or intestinal dysbiosis. Balanced levels reflect normal gut metabolic activity and effective detoxification processes.

Providencia spp. are gram-negative, facultatively anaerobic bacteria belonging to the Enterobacteriaceae family. They are not usually predominant members of the gut microbiome but can be found in small amounts. Certain species, such as Providencia stuartii and Providencia rettgeri, are regarded as opportunistic pathogens and have been linked to urinary tract infections and gastrointestinal disturbances. Elevated levels in a stool sample may indicate microbial imbalance (dysbiosis) or an overgrowth of potentially pathogenic strains. Providencia species are also noted for their ability to produce urease and contribute to ammonia formation.

Proteobacteria is a large phylum of Gram-negative bacteria that includes both harmless commensals and potential pathogens. In the gut, a small amount of Proteobacteria can be normal, but elevated levels are often considered a marker of dysbiosis and inflammation. This group includes species such as Escherichia, Salmonella, Helicobacter, and Klebsiella, some of which are linked to gastrointestinal disorders, infections, and metabolic imbalances. An increased abundance of Proteobacteria may reflect microbial instability or a pro-inflammatory gut environment.

Primary bile acids – cholic acid (CA) and chenodeoxycholic acid (CDCA) – are produced in the liver and constitute the initial stage of bile acid metabolism. They are vital for emulsifying dietary fats and aiding the absorption of fat-soluble vitamins. Elevated levels may indicate altered bile acid synthesis or cholestasis, whereas low levels could suggest reduced liver production or bile flow. Balanced concentrations indicate normal liver function and bile acid turnover.

The Potassium/Calcium ratio in whole blood is a valuable indicator for assessing mineral balance and cellular function. The ratio between these two minerals can reveal potential imbalances that may impact neuromuscular function, cardiovascular stability, or hormonal regulation. A disturbed ratio may be influenced by diet, stress, kidney function, or adrenal activity. Monitoring this ratio can help detect underlying issues even when individual mineral levels appear normal.

Phenols are organic compounds produced by gut bacteria during the fermentation of certain amino acids, particularly tyrosine. Some phenols, such as p-cresol, can be toxic at high concentrations and are linked to dysbiosis or imbalances in the gut microbiota. Elevated phenol levels in stool may indicate microbial activity that places stress on the liver’s detoxification systems. Monitoring phenols helps evaluate how effectively the gut is managing protein breakdown and microbial fermentation processes.

Perennial ryegrass (Lolium perenne) is a cool-season grass commonly used for lawns, pastures, and turf due to its rapid growth and resilience. It belongs to the Poaceae family and is a well-known source of seasonal allergens. During its pollination period—typically late spring to early summer—it releases airborne pollen that can trigger allergic reactions such as hay fever and asthma in sensitive individuals. The allergenic potential of perennial ryegrass makes it a significant component in inhalant allergy testing panels.

The PDXK gene encodes the enzyme pyridoxal kinase, which is crucial for converting vitamin B6 into its active form, pyridoxal-5′-phosphate (PLP). PLP acts as a coenzyme in over 100 enzymatic reactions, many of which are involved in amino acid metabolism, neurotransmitter synthesis, and energy production. Variants in the PDXK gene may impair this conversion, potentially leading to a functional vitamin B6 deficiency even if B6 intake is adequate. Disruption in PLP levels has been associated with neurological symptoms, fatigue, and mood disturbances.

Neopterin is a molecule produced by immune cells, particularly macrophages, in response to stimulation by interferon-gamma. It is regarded as a marker of immune system activation and inflammation. Elevated levels of neopterin in urine or blood can indicate increased immune activity, commonly observed in infections, autoimmune disorders, or chronic inflammatory conditions. As it reflects the cellular immune response, neopterin is sometimes used to monitor disease progression or the status of the immune system.

MTRR (Methionine Synthase Reductase): MTRR is an enzyme that plays a vital role in regenerating methylcobalamin, supporting the continuous activity of MTR in homocysteine metabolism. It is essential for maintaining proper methionine levels and normal DNA synthesis. Mutations in MTRR are associated with homocystinuria, which may contribute to developmental and neurological complications. Understanding MTRR function offers insights into potential therapies for genetic disorders.

The MTHFS gene encodes methenyltetrahydrofolate synthetase, an enzyme involved in folate metabolism. It plays a vital role in maintaining the pool of active folate derivatives used for methylation, DNA synthesis, and neurotransmitter production. MTHFS regulates the conversion of various folate forms and helps maintain the balance of one-carbon units essential for cellular function. Variants in this gene may disrupt folate recycling, potentially affecting methylation pathways and contributing to issues such as impaired detoxification, fatigue, or mood imbalance.

The MTHFD1L gene encodes a mitochondrial enzyme involved in the folate cycle and one-carbon metabolism, specifically in the conversion of formate to 10-formyl-THF. This process supports purine synthesis and methylation reactions, which are essential for DNA and RNA production and cellular repair. Genetic variations in MTHFD1L can affect mitochondrial folate metabolism and have been associated with an increased risk of neural tube defects, cardiovascular problems, and impaired methylation. It plays a complementary role to the cytosolic MTHFD1 gene but functions within the mitochondria.

Morganella spp., most notably Morganella morganii, are gram-negative bacteria belonging to the Enterobacteriaceae family. They are considered opportunistic pathogens and are occasionally found in the human intestinal tract as part of the normal flora. However, elevated levels in stool may indicate dysbiosis or potential infection risk, especially in immunocompromised individuals. Morganella is also known for its production of biogenic amines, such as putrescine and cadaverine, which can contribute to gut and systemic symptoms. In clinical settings, Morganella morganii has been associated with urinary tract infections and other hospital-acquired infections.

Microsporidia are a group of microscopic, spore-forming parasites that primarily infect the intestinal tract but can also affect the eyes, muscles, and other organs, especially in individuals with weakened immune systems. These organisms are classified as fungi or fungus-like and are known to cause a condition called microsporidiosis. Transmission typically occurs through ingestion of contaminated food or water, or contact with infected animals or surfaces. Symptoms can include chronic diarrhea, weight loss, fatigue, and abdominal discomfort.

Microplastic particles refer to tiny fragments of plastic, typically less than 5 millimeters in size, with this test specifically focusing on particles smaller than 30 micrometers. These particles can originate from a wide range of sources, including food packaging, textiles, cosmetics, personal care products, and environmental pollution. Once ingested or inhaled, microplastics may enter the bloodstream and circulate in the body.

Methanobrevibacter species are archaea—microorganisms distinct from bacteria—that primarily inhabit the human gut. These microbes are known for producing methane gas as a by-product of fermentation, especially from hydrogen and carbon dioxide. Elevated levels of Methanobrevibacter spp. have been linked to slowed intestinal transit and symptoms such as constipation and bloating. Unlike many bacteria, archaea are not affected by standard antibiotics, making their overgrowth more difficult to manage. Their presence offers insight into the balance of microbial communities and gas production within the gut.

Mandarin (Citrus reticulata) is a small citrus fruit known for its sweet flavour, easy-to-peel skin, and vibrant orange colour. Rich in vitamin C, antioxidants, and flavonoids, mandarins support immune function and help protect against oxidative stress. Due to their mild and pleasant taste, they are commonly eaten fresh or used in juices and desserts. Some individuals may, however, experience allergic reactions to citrus fruits, including mandarins.

Lenscale refers to microscopic particles of shed skin, hair, or feathers from animals, primarily pets such as cats and dogs. These particles can become airborne, settle on furniture, bedding, or carpets, and trigger allergic reactions in sensitive individuals. Unlike larger fur clumps, lenscale is extremely light and often invisible to the eye, which makes it a persistent allergen indoors even in clean environments. Allergic reactions to lenscale are caused by specific proteins found in the skin secretions or saliva of animals, which adhere to these fine particles. Even without direct animal contact, individuals can experience symptoms if exposed to contaminated environments.

Lamb's quarters (Chenopodium album) is a common wild plant found in many temperate regions across the world. While it is sometimes eaten as a leafy green in foraging and traditional cuisines, it is also a known source of airborne allergens. The plant produces fine, powdery pollen during the summer, which can become airborne and cause allergic reactions such as hay fever, nasal congestion, and asthma symptoms in sensitive individuals. Due to its wide distribution and allergenic potential, lamb's quarters is often included in inhalant allergy panels.

Johnson grass (Sorghum halepense) is a fast-growing perennial grass native to the Mediterranean region but now widespread in many parts of the world, especially in warm and temperate climates. It is regarded both as an agricultural weed and a significant source of airborne allergens. Its pollen is released during the warmer months and can provoke allergic reactions in susceptible individuals, particularly those with seasonal allergic rhinitis or asthma. Johnson grass belongs to the Poaceae (grass) family, which includes many cross-reactive species.

Indoxyl sulfate is a uraemic toxin formed when gut bacteria metabolise the amino acid tryptophan into indole, which is then absorbed and converted into indoxyl sulfate in the liver. While small amounts are normally excreted via the kidneys, elevated levels may indicate impaired detoxification, dysbiosis, or renal stress. Indoxyl sulfate has been linked to oxidative stress, systemic inflammation, and vascular dysfunction—especially in individuals with compromised kidney function. It serves as a marker of both microbial activity and the body’s ability to process and eliminate metabolic waste.

Indolpropionic acid (IPA) is a microbial metabolite derived from the amino acid tryptophan. It is recognised for its antioxidant properties and plays a protective role in gut barrier integrity and glucose metabolism. Higher levels are generally associated with a balanced gut microbiota and a healthy intestinal environment. Low concentrations may indicate reduced microbial diversity, altered tryptophan metabolism, or increased oxidative stress.

Indole-3-acetic acid is a tryptophan-derived metabolite produced by intestinal bacteria. It plays a role in gut–liver communication and can affect oxidative stress and intestinal permeability. Elevated IAA levels may indicate dysbiosis, increased bacterial tryptophan metabolism, or altered liver detoxification pathways. Normal concentrations suggest balanced gut microbiota activity and efficient metabolic clearance.

IgM antibodies are the first type of antibodies produced by the immune system in response to an acute infection. When IgM against Mycoplasma pneumoniae is present, it typically indicates a recent or ongoing infection. These antibodies appear within 1–2 weeks of exposure and usually decline after a few months. Testing for IgM is useful in identifying the early phase of a Mycoplasma pneumoniae infection, especially in symptomatic individuals.

IDO (indoleamine 2,3-dioxygenase) activity reflects the rate at which the amino acid tryptophan is converted into kynurenine. This pathway is regulated by immune and inflammatory signals, particularly cytokines such as interferon-γ. Increased IDO activity (low tryptophan/kynurenine ratio) may indicate immune activation, chronic inflammation, or oxidative stress. Balanced IDO activity suggests normal immune regulation and adequate tryptophan availability for serotonin and melatonin synthesis.

HSV-2 IgG antibodies are produced by the immune system in response to Herpes Simplex Virus type 2, which is most commonly linked to genital herpes. A positive result indicates prior exposure to HSV-2, even if no symptoms have been experienced. These antibodies usually develop within several weeks after infection and persist long-term. The test identifies whether an individual has been infected at some point but cannot determine the timing or whether the virus is currently active.

The presence of HSV-1 IgG antibodies indicates past or ongoing infection with Herpes Simplex Virus type 1. HSV-1 is commonly associated with oral herpes but can also cause genital infections. IgG antibodies typically appear a few weeks after initial infection and remain in the body for life, serving as a marker of previous exposure. This test does not indicate whether the infection is currently active but helps confirm whether the immune system has encountered the virus. A positive result may be clinically relevant in evaluating symptoms or in pre-screening before certain medical procedures.

Homocysteine is a sulphur-containing amino acid produced during the metabolism of methionine, an essential amino acid. It plays a key role in methylation, detoxification, and cardiovascular function. Elevated homocysteine levels have been associated with increased risk of heart disease, stroke, cognitive decline, and pregnancy complications. Imbalances may be caused by deficiencies in B vitamins (especially B6, B12, and folate), impaired methylation, or genetic variants like MTHFR. Monitoring homocysteine levels can provide valuable insights into cardiovascular, neurological, and metabolic health.

HIV-2 is a less common type of human immunodeficiency virus. Like HIV-1, it affects immune cells and can lead to immune suppression over time, but it is generally associated with slower disease progression. HIV-2 remains clinically significant and requires accurate diagnostic confirmation and medical monitoring.

HIV-1 is the most common type of human immunodeficiency virus. It primarily targets immune cells (especially CD4 T-cells) and, if left untreated, can gradually weaken the immune system over time. HIV-1 is the main cause of the global HIV epidemic and is the type most people refer to when they say “HIV”.

Histamine-producing bacteria are gut microbes capable of converting the amino acid histidine into histamine, a biogenic amine that plays a central role in immune responses and allergic reactions. While histamine is an essential signalling molecule, excess production in the gut can contribute to symptoms resembling allergies, such as rashes, headaches, or digestive discomfort. These bacteria may thrive in the presence of chronic stress, poor gut barrier function, or diets rich in histidine-containing foods. Elevated levels are associated with conditions like histamine intolerance or pseudoallergies. Maintaining a balanced microbiome and proper gut barrier integrity may help reduce histamine load from microbial sources.

Histamine is a bioactive compound derived from the amino acid histidine and plays key roles in immune defence, stomach acid secretion, and inflammatory responses. In the bloodstream, histamine reflects both mast cell activity and the body’s ability to break down histamine via enzymes such as DAO and HNMT. Elevated histamine levels may indicate immune activation, allergic response, or reduced capacity to degrade histamine. Low or balanced histamine concentrations suggest normal regulation of histamine metabolism and immune function.

Hippuric acid is a metabolic compound formed in the liver through the conjugation of benzoic acid with glycine. It reflects both detoxification capacity and microbial activity in the gut. Elevated levels may indicate increased microbial fermentation, exposure to certain food additives, or an active detoxification response. Low concentrations can be observed with reduced liver conjugation capacity or low microbial production of precursors.

Fusobacterium is a genus of anaerobic, gram-negative bacteria naturally found in the human oral cavity, gastrointestinal tract, and sometimes in the vaginal flora. While some species may be part of a normal microbiome, Fusobacterium is also recognised for its association with inflammation and infection. Elevated levels in the gut have been linked to conditions such as inflammatory bowel disease (IBD) and colorectal cancer. Its presence is often considered a marker of microbial imbalance or pathogenic overgrowth, especially when found alongside symptoms like bloating or changes in bowel habits.