" /> Variegate porphyria - CISMeF





Preferred Label : Variegate porphyria;

Symbol : VP;

CISMeF acronym : VP;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Porphyria, south african type; Protoporphyrinogen oxidase deficiency; Ppox deficiency; Porphyria variegata;

Description : Variegate porphyria is characterized by cutaneous manifestations, including increased photosensitivity, blistering, skin fragility with chronic scarring of sun-exposed areas, and postinflammatory hyperpigmentation. Acute exacerbations of VP include abdominal pain, the passage of dark urine, and neuropsychiatric symptoms that characterize the acute hepatic porphyrias, such as bulbar paralysis, quadriplegia, motor neuropathy, and weakness of the limbs. In heterozygotes, PPOX activity is decreased by about 50% (summary by Frank et al., 1998).;

Inheritance : Autosomal dominant;

Molecular basis : Caused by mutation in the protoporphyrinogen oxidase gene (PPOX, 600923.0001);

Laboratory abnormalities : Increased urinary porphyrin precursors porphobilinogen (PBG) and delta-aminolevulinic acid (ALA) during acute attacks; Increased urine porphyrins at times; Elevated fecal levels of protoporphyrin and coproporphyrin at all times; Reduced (50%) activity of protoporphyrinogen oxidase (PROTO oxidase);

Prefixed ID : #176200;

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27/05/2025


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