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Porphobilinogen (PBG) is an organic compound that occurs in living organisms as an intermediate in the biosynthesis of porphyrins, which include critical substances ...
Aminolevulinic acid dehydratase (porphobilinogen synthase, or ALA dehydratase, or aminolevulinate dehydratase) is an enzyme (EC 4.2.1.24) that in humans is encoded by the ALAD gene. [ 5 ] [ 6 ] Porphobilinogen synthase (or ALA dehydratase , or aminolevulinate dehydratase ) synthesizes porphobilinogen through the asymmetric condensation of two ...
A urine test strip or dipstick is a basic diagnostic tool used to determine pathological changes in a patient's urine ... porphobilinogen, indican, p-amino salicylic ...
The most well-known health issue involving porphobilinogen deaminase is acute intermittent porphyria, an autosomal dominant genetic disorder where insufficient hydroxymethylbilane is produced, leading to a build-up of porphobilinogen in the cytoplasm. This is caused by a gene mutation that, in 90% of cases, causes decreased amounts of enzyme.
The Watson–Schwartz test is a screening test for diagnosing intermittent porphyria, although it might also become positive in porphyria cutanea tarda (a skin form of porphyria). In this method, porphobilinogen is detected by a color reaction with Ehrlich reagent and confirming that the color is not removed by chloroform .
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Elevated urine porphobilinogen confirms diagnosis of AIP, hereditary coproporphyria (HCP), or variegate porphyria (VP). A positive test should be indicated with an increase of five times normal, not just a slight increase which can occur with dehydration .
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