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Type I xanthinuria can be caused by a deficiency of xanthine oxidase, which is an enzyme necessary for converting xanthine to uric acid. [2] Type II xanthinuria and molybdenum cofactor deficiency lack one or two other enzyme activities in addition to xanthine oxidase.
Mutations in the gene lead to hyperuricemia.At least 67 disease-causing mutations in this gene have been discovered: [5] Some men have partial (up to 20% less activity of the enzyme) HGPRT deficiency that causes high levels of uric acid in the blood, which leads to the development of gouty arthritis and the formation of uric acid stones in the urinary tract.
Isolated reports of scombroid food poisoning in humans caused by histamine present in the tissues of stale or rotten scombroid fish, usually tuna, have occurred over the years. In September 2016, authorities in Singapore intercepted canned tuna imported from Thailand after finding high levels of histamine. [12] No human cases were reported.
Packed in water, this canned tuna has 120 mg of sodium and 5 grams of fat per serving. “The moderate fat content, much of which is likely to be heart-healthy unsaturated fats, supports satiety ...
Tuna is lower in fat than other popular canned fish varieties like sardines, but also comparatively lower in heart-healthy omega-3 fatty acids, says Zumpano. There's one big catch: Not all canned ...
Unless high blood levels of uric acid are determined in a clinical laboratory, hyperuricemia may not cause noticeable symptoms in most people. [5] Development of gout – which is a painful, short-term disorder – is the most common consequence of hyperuricemia, which causes deposition of uric acid crystals usually in joints of the extremities, but may also induce formation of kidney stones ...
Hyperuricosuria is a medical term referring to the presence of excessive amounts of uric acid in the urine. For men this is at a rate greater than 800 mg/day, and for women, 750 mg/day. [ 1 ] Notable direct causes of hyperuricosuria are dissolution of uric acid crystals in the kidneys or urinary bladder , and hyperuricemia .
The disorder is caused by a mutation of the purine nucleoside phosphorylase (PNP) gene, located at chromosome 14q13.1. [3] [4] This mutation was first identified by Eloise Giblett, a professor at the University of Washington, in 1975. [5] PNP is a key enzyme in the purine catabolic [6] pathway, and is required for purine degradation.