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Porphyria cutanea tarda is the most common subtype of porphyria. [1] The disease is named because it is a porphyria that often presents with skin manifestations later in life. The disorder results from low levels of the enzyme responsible for the fifth step in heme production. Heme is a vital molecule for all of the body's organs.
They may be inherited in an autosomal dominant, autosomal recessive, or X-linked dominant manner. [1] One type, porphyria cutanea tarda, may also be due to hemochromatosis (increased iron in the liver), hepatitis C, alcohol, or HIV/AIDS. [1]
Erythropoietic protoporphyria (or commonly called EPP) is a form of porphyria, which varies in severity and can be very painful.It arises from a deficiency in the enzyme ferrochelatase, leading to abnormally high levels of protoporphyrin in the red blood cells (erythrocytes), plasma, skin, and liver. [2]
Variegate porphyria is inherited in an autosomal dominant pattern, which means the defective gene is located on an autosome, and inheriting one copy of the defective gene from an affected parent is sufficient to cause the disorder. More severe cases result from inheriting two copies of the defective gene.
Hereditary coproporphyria (HCP) is a disorder of heme biosynthesis, classified as an acute hepatic porphyria. [1] HCP is caused by a deficiency of the enzyme coproporphyrinogen oxidase, coded for by the CPOX gene, and is inherited in an autosomal dominant fashion, although homozygous individuals have been identified.
Acute intermittent porphyria (AIP) is a rare metabolic disorder affecting the production of heme resulting from a deficiency of the enzyme porphobilinogen deaminase. It is the most common of the acute porphyrias .
Porphyria cutanea tarda; V. Variegate porphyria; W. Watson–Schwartz test This page was last edited on 27 November 2020, at 02:14 (UTC). Text is available under ...
These include Hepatoerythropoietic Porphyria and rare homozygous variants of Variegate Porphyria, Hereditary Coproporphyria, and STING-associated vasculopathy with onset in Infancy (SAVI). Mild variants may be present similarly to Porphyria Cutanea Tarda. [citation needed] There are four steps in establishing the diagnosis of any porphyria.
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