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Trimethylaminuria (TMAU), also known as fish odor syndrome or fish malodor syndrome, [1] is a rare metabolic disorder that causes a defect in the normal production of an enzyme named flavin-containing monooxygenase 3 (FMO3).
[13] [14] Genetic deficiencies of the FMO3 enzyme cause primary trimethylaminuria, also known as "fish odor syndrome". [8] [15] FMO3 is also involved in the metabolism of many xenobiotics (i.e., exogenous compounds which are not normally present in the body), [9] [10] such as the oxidative deamination of amphetamine. [9] [16] [17]
The trimethylaminuria disorder, also known as fish odor syndrome, causes abnormal FMO3-mediated metabolism or a deficiency of this enzyme in an individual. A person with this disorder has a low capacity to oxidize the trimethylamine (TMA) that comes from their diet to its odourless metabolite TMAO. [ 34 ]
Individuals with trimethylaminuria develop a characteristic fish odor—the smell of trimethylamine—in their sweat, urine, and breath after the consumption of choline-rich foods. A condition similar to trimethylaminuria has also been observed in a certain breed of Rhode Island Red chicken that produces eggs with a fishy smell, especially ...
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Metabolic N-oxidation of the diet-derived amino-trimethylamine (TMA) is mediated by flavin-containing monooxygenase and is subject to an inherited FMO3 polymorphism in humans resulting in a small subpopulation with reduced TMA N-oxidation capacity resulting in fish odor syndrome Trimethylaminuria. Three forms of the enzyme, FMO1 found in fetal ...
Trimethylaminuria is a rare defect in the production of the enzyme flavin-containing monooxygenase 3 (FMO3). [19] [20] Those suffering from trimethylaminuria are unable to convert choline-derived trimethylamine into trimethylamine oxide. Trimethylamine then accumulates and is released in the person's sweat, urine, and breath, giving off a ...
Trimethylaminuria (TMAU), also known as fish odor syndrome or fish malodor syndrome, is a rare metabolic disorder where trimethylamine is released in the person's sweat, urine, and breath, giving off a strong fishy odor or strong body odor. [58]