Porphyria Diagnostics—Part 1: A Brief Overview of the Porphyrias

Vaithamanithi‐Mudumbai Sadagopa Ramanujam1, Karl Elmo Anderson1

1 The University of Texas Medical Branch, Galveston, Texas
Publication Name:  Current Protocols in Human Genetics
Unit Number:  Unit 17.20
DOI:  10.1002/0471142905.hg1720s86
Online Posting Date:  July, 2015
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Abstract

Porphyria diseases are a group of metabolic disorders caused by abnormal functioning of heme biosynthesis enzymes and characterized by excessive accumulation and excretion of porphyrins and their precursors. Precisely which of these chemicals builds up depends on the type of porphyria. Porphyria is not a single disease but a group of nine disorders: acute intermittent porphyria (AIP), hereditary coproporphyria (HCP), variegate porphyria (VP), δ‐aminolevulinic acid dehydratase deficiency porphyria (ADP), porphyria cutanea tarda (PCT), hepatoerythropoietic porphyria (HEP), congenital erythropoietic porphyria (CEP), erythropoietic protoporphyria (EPP), and X‐linked protoporphyria (XLP). Each porphyria results from overproduction of heme precursors secondary to partial deficiency or, in XLP, increased activity of one of the enzymes of heme biosynthesis. Taken together, all forms of porphyria afflict fewer than 200,000 people in the United States. Based on European studies, the most common porphyria, PCT, has a prevalence of 1 in 10,000, the most common acute porphyria, AlP, has a prevalence of ∼1 in 20,000, and the most common erythropoietic porphyria, EPP, is estimated at 1 in 50,000 to 75,000. CEP is extremely rare, with prevalence estimates of 1 in 1,000,000 or less. Only six cases of ADP are documented. The current porphyria literature is very exhaustive and a brief overview of porphyria diseases is essential in order for the reader to better appreciate the relevance of this area of research prior to undertaking biochemical diagnostics procedures. This unit summarizes the current knowledge on the classification, clinical features, etiology, pathogenesis, and genetics of porphyria diseases. © 2015 by John Wiley & Sons, Inc.

Keywords: Porphyria; overview; clinical features; etiology; pathogenesis

     
 
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Table of Contents

  • Introduction
  • Classification, Inheritance, and Prevalence of Porphyrias
  • Acute Hepatic Porphyrias
  • Non‐Acute Hepatic Porphyrias
  • Erythropoietic Porphyrias
  • Acknowledgements
  • Literature Cited
  • Figures
  • Tables
     
 
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Materials

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Literature Cited

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