Erythropoietic protoporphyrias: Pathogenesis, diagnosis and management
Anna-Elisabeth Minder1,2, Louisa G Kluijver3, Jasmin Barman-Aksözen2,4,5
1Division of Endocrinology, Diabetology, and Porphyria, Stadtspital Zürich Triemli, Zurich, Switzerland.
Summary
Erythropoietic protoporphyrias (EPPs) are rare genetic disorders causing light-induced pain due to protoporphyrin IX accumulation. Management focuses on preventing complications like liver failure and improving quality of life with treatments like afamelanotide.
Area of Science:
- Biochemistry
- Genetics
- Dermatology
Background:
- Erythropoietic protoporphyrias (EPPs) are ultra-rare genetic disorders affecting heme biosynthesis.
- These conditions lead to protoporphyrin IX (PPIX) accumulation in red blood cells.
- Patients experience severe phototoxic pain from early childhood.
Purpose of the Study:
- To summarize the diagnosis, complications, and management of EPPs.
- To highlight differences in iron supplementation effects between EPP subtypes.
- To outline treatment strategies for EPP-related liver disease.
Main Methods:
- Diagnosis confirmed by erythrocyte PPIX quantification (≥3x ULN).
- Management strategies include photoprotection and complication treatment.
- Therapeutic options for liver disease range from phlebotomy to liver transplantation.
Main Results:
- EPPs lead to complications including liver failure, gallstones, anemia, and vitamin D deficiency.
- Iron supplementation can worsen photosensitivity in EPP1 but improve it in XLEPP.
- Afamelanotide is the only approved treatment to increase pain-free sun exposure.
Conclusions:
- Multidisciplinary management by porphyria experts is crucial for EPPs.
- Treatment must be individualized, especially regarding iron supplementation and liver disease.
- Afamelanotide offers a specific therapeutic option to improve patient quality of life.
Keywords:
CLPX‐protoporphyriaEPPX‐linked protoporphyriaafamelanotidecholestatic liver diseaseerythropoietic protoporphyriapainful skin photosensitivityprotoporphyria‐related liver damageMore Related Videos
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