Background
Variegate porphyria (VP) is an inherited disorder of porphyrin-heme metabolism arising from mutations of the gene encoding the enzyme protoporphyrinogen oxidase.[1, 2, 3, 4] Manifestations of variegate porphyria in any given individual may include cutaneous photosensitivity, systemic symptoms arising from neurologic dysfunction, or both.[3, 5, 6, 7, 8]
Pathophysiology
Inherited as an autosomal dominant trait, variegate porphyria is biochemically characterized by accumulations of the photosensitizing porphyrins protoporphyrin and coproporphyrin.[5] In addition, abnormally high levels of the porphyrin precursors porphobilinogen and aminolevulinic acid are found during episodic attacks of systemic symptoms.[5, 9] These episodes are caused by dysfunctions of central, autonomic, and peripheral nervous systems that appear to be effects of deranged heme synthesis on neurons.[10]
Epidemiology
Frequency
United States
A porphyria registry has only recently been established in the United States (American Porphyria Foundation); therefore, accurate figures are not yet available. Unknown numbers of cases may still be unrecognized or misdiagnosed as another porphyria.
International
Incidence is estimated at 1 case in 300 persons in South Africa, where a protoporphyrinogen oxidase gene "founder" mutation traceable to Dutch immigrants who married there in 1680 has been widely disseminated.[11, 12] In other parts of the world, variegate porphyria is considered uncommon to rare. It is the most common acute porphyria in Chile,[13] where another "founder" mutation has more recently been identified in 4 apparently unrelated families.[14]
Mortality/Morbidity
Cutaneous photosensitivity may cause difficulty performing manual labor and may limit many daily activities. Neurovisceral disorders vary from relatively mild symptoms that can remit spontaneously to profound crises that can be fatal or incapacitating for months to years.[3, 5, 6, 7, 15]
Race
No well-established racial predilection is known, although the disease is common among South Africans of Dutch ancestry, many of whom inherit the founder gene propagated in that population. Most multiple case reports involve European populations or North or South American populations that include individuals with European heritage.
Sex
Variegate porphyria occurs in both men and women, but is manifested more often in women.
Age
Variegate porphyria usually presents after puberty. Very rare childhood cases have been ascribed to the presence of 2 mutant protoporphyrinogen oxidase genes in the same individual.[16, 17]
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