The Human Phenotype Ontology (HPO) provides the following list of features that have been reported in people with this condition. Much of the information in the HPO comes from Orphanet, a European rare disease database. If available, the list includes a rough estimate of how common a feature is (its frequency). Frequencies are based on a specific study and may not be representative of all studies. You can use the MedlinePlus Medical Dictionary for definitions of the terms below.
|Signs and Symptoms||Approximate number of patients (when available)|
|Abnormal blistering of the skin||90%|
|Autosomal dominant inheritance||-|
Variegate porphyria is caused by mutations in the PPOX gene. Mutations in the PPOX gene reduce the activity of protoporphyrinogen oxidase, allowing compounds called porphyrin precursors to build up in the body. These compounds are formed during the normal process of heme production, but reduced activity of protoporphyrinogen oxidase allows them to accumulate to toxic levels. More than 130 mutations in the PPOX gene have been identified in people with variegate porphyria. A particular PPOX gene mutation is found in about 95 percent of South African families with the disorder.
Nongenetic factors such as certain drugs, alcohol, dieting, as well as other genetic factors that have not been identified, also contribute to the characteristic features of variegate porphyria.
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I have just had my DNA report returned to find that I am a carrier of variegate porphyia as is my daughter. We both are asymptomatic. I am not South African Dutch. How many second generation and now third generation Americans are diagnosed yearly? If I have never had symptoms (age 65), will I have symptoms? See answer