Erythropoietic Protoporphyria

National Organization for Rare Disorders, Inc.

Skip to the navigation

It is possible that the main title of the report Erythropoietic Protoporphyria is not the name you expected.

Disorder Subdivisions

  • None

General Discussion

Erythropoietic protoporphyria (EPP) is a rare inherited metabolic disorder characterized by a deficiency of the enzyme ferrochelatase (FECH). Due to abnormally low levels of this enzyme, excessive amounts of protoporphyrin accumulate in the bone marrow, blood plasma, and red blood cells. The major symptom of this disorder is hypersensitivity of the skin to sunlight and some types of artificial light, such as fluorescent lights (photosensitivity). After exposure to light, the skin may become itchy and red. Affected individuals may also experience a burning sensation on their skin. The hands, arms, and face are the most commonly affected areas. Some people with erythropoietic protoporphyria may also have complications related to liver and gallbladder function. Erythropoietic protoporphyria is inherited as an autosomal dominant genetic trait with poor penetrance.

Erythropoietic protoporphyria is one of a group of disorders known as the porphyrias. The porphyrias are all characterized by abnormally high levels of particular chemicals (porphyrins) in the body due to deficiencies of certain enzymes essential to the synthesis of hemoglobin. There are at least seven types of porphyria. The symptoms associated with the various types of porphyria differ, depending upon the specific enzyme that is deficient. It is important to note that people who have one type of porphyria do not develop any of the other types.

Supporting Organizations

American Porphyria Foundation

4900 Woodway, Suite 780
Houston, TX 77056-1837
Tel: (713)266-9617
Fax: (713)840-9552
Tel: (866)273-3635

CLIMB (Children Living with Inherited Metabolic Diseases)

Climb Building
176 Nantwich Road
Crewe, CW2 6BG
United Kingdom
Tel: 4408452412173
Fax: 4408452412174

Erythropoietic Protoporphyria Research and Education Fund

Channing Lab
Harvard Medical School
Boston, MA 2115
Tel: (617)525-8249
Tel: (800)638-6294

Genetic and Rare Diseases (GARD) Information Center

PO Box 8126
Gaithersburg, MD 20898-8126
Tel: (301)251-4925
Fax: (301)251-4911
Tel: (888)205-2311

MedicAlert Foundation International

2323 Colorado Avenue
Turlock, CA 95382
Tel: (209)669-2401
Fax: (209)669-2456
Tel: (888)633-4298

NIH/National Institute of Diabetes, Digestive & Kidney Diseases

Office of Communications & Public Liaison
Bldg 31, Rm 9A06
Bethesda, MD 20892-2560
Tel: (301)496-3583

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders (NORD). For a full-text version of this report, go to and click on Rare Disease Database under "Rare Disease Information".

The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only.

It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report.

This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.

Last Updated:  2/1/2012
Copyright  2012 National Organization for Rare Disorders, Inc.