National Organization for Rare Disorders, Inc.
It is possible that the main title of the report X-Linked Protoporphyria is not the name you expected.
X-linked protoporphyria is an extremely rare genetic disorder characterized by an abnormal sensitivity to the sun (photosensitivity) that can cause severe pain, burning, and itching of sun-exposed skin. Symptoms may occur immediately or shortly after exposure to the sun, including direct exposure or indirect exposure such as sunlight that passes through window glass or that is reflected off water or sand. Redness and swelling of affected areas can also occur. Blistering and severe scarring occur infrequently. Chronic episodes of photosensitivity may lead to changes in the skin of sun-exposed areas. Some individuals eventually develop potentially severe liver disease. X-linked protoporphyria is caused by mutations of the ALAS2 gene and is inherited as an X-linked dominant trait. Males often develop a severe form of the disorder while females may not develop any symptoms (asymptomatic) or can develop a form as severe as that seen in males.
X-linked protoporphyria belongs to a group of disorders known as the porphyrias. This group of at least eight disorders is characterized by abnormally high levels of porphyrins and porphyrin precursors due to deficiency of certain enzymes essential to the creation (synthesis) of heme, a part of hemoglobin and other hemoproteins. There are eight enzymes in the pathway for making heme and at least eight different forms of porphyria. The symptoms associated with the various forms of porphyria differ. It is important to note that people who have one type of porphyria do not develop any of the other types. Porphyrias are generally classified into two groups: the "hepatic" and "erythropoietic" types. Porphyrins and porphyrin precursors and related substances originate in excess amounts chiefly from the liver in the hepatic types and mostly from the bone marrow in the erythropoietic types. Porphyrias with skin manifestations are sometimes referred to as "cutaneous porphyrias." The term "acute porphyria" is used to describe porphyrias that can be associated with sudden attacks of pain and other neurological symptoms.
X-linked protoporphyria is an erythropoietic form of porphyria and is extremely similar clinically to erythropoietic protoporphyria (EPP). X-linked protoporphyria was first described in the medical literature in 2008.
American Porphyria Foundation
- 4900 Woodway, Suite 780
- Houston, TX 77056-1837
- Tel: (713)266-9617
- Fax: (713)840-9552
- Tel: (866)273-3635
- Email: firstname.lastname@example.org
- Website: http://www.porphyriafoundation.com
British Porphyria Association
- 136 Devonshire Rd
- Durham City, DH1 2BL
- United Kingdom
- Tel: 1474369231
- Email: email@example.com
- Website: http://www.porphyria.org.uk
CLIMB (Children Living with Inherited Metabolic Diseases)
- Climb Building
- 176 Nantwich Road
- Crewe, CW2 6BG
- United Kingdom
- Tel: 4408452412173
- Fax: 4408452412174
- Email: firstname.lastname@example.org
- Website: http://www.CLIMB.org.uk
Erythropoietic Protoporphyria Research and Education Fund
- Channing Lab
- Harvard Medical School
- Boston, MA 2115
- Tel: (617)525-8249
- Tel: (800)638-6294
- Email: email@example.com
- Website: http://www.brighamandwomens.org/Patients_Visitors/patientresources/patienteducation/eppref/
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
- Website: http://rarediseases.info.nih.gov/GARD/
Norwegian Porphyria Centre
- Haukeland University Hospital
- Postboks 7804
- Bergen, NO-5021
- Tel: 4755973050
- Fax: 4755973115
- Email: firstname.lastname@example.org
- Website: http://www.napos.no
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 www.rarediseases.org 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: 4/5/2016
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