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[Inheritance in erythropoietic protoporphyria].

C Schmitt¹, S Ducamp, L Gouya

¹Centre Français des Porphyries, Service de Biochimie, Hôpital Louis-Mourier, AP-HP, 178 rue des Renouillers, 92701 Colombes cedex, France.

Pathologie-Biologie

|September 21, 2010

Summary

Erythropoietic protoporphyria (EPP) is a genetic disorder of heme synthesis. Genetic variations in FECH and ALAS2 genes explain EPP prevalence globally and its absence in some populations.

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Area of Science:

Biochemistry
Genetics
Dermatology

Background:

Erythropoietic protoporphyria (EPP) is an inherited disorder of heme biosynthesis.
It results from protoporphyrin IX accumulation, causing photosensitivity and potential liver disease.
EPP involves two genes: FECH and ALAS2.

Purpose of the Study:

To investigate the genetic basis of Erythropoietic protoporphyria (EPP).
To understand the varying prevalence of EPP across different populations.
To explore the role of specific genetic mutations in EPP pathogenesis.

Main Methods:

Analysis of genetic mutations in the FECH and ALAS2 genes.
Population-based frequency assessment of the IVS3-48C FECH allele.
Phylogenetic analysis of IVS3-48C haplotypes.

Main Results:

Over 96% of EPP patients have ferrochelatase (FECH) deficiency, often due to a common hypomorphic allele (IVS3-48C).
The varying frequency of the IVS3-48C allele explains global EPP prevalence differences.
X-linked dominant protoporphyria (XLDPP), caused by ALAS2 mutations, accounts for approximately 4% of EPP cases.

Conclusions:

Genetic variations, particularly in the FECH gene and its common IVS3-48C allele, are key determinants of EPP prevalence.
The IVS3-48C allele's origin and distribution explain the ethnic variations in EPP.
Understanding these genetic factors is crucial for EPP diagnosis and management.