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J Eur Acad Dermatol Venereol. 2010 Jun;24(6):726-9. doi: 10.1111/j.1468-3083.2009.03471.x. Epub 2009 Nov 2.

A novel splicing mutation and haplotype analysis of the FECH gene in a Chinese family with erythropoietic protoporphyria.

Author information

1
Department of Dermatology, The Second Hospital of Xi'an Jiaotong University, Shaanxi, China.

Abstract

BACKGROUND:

Erythropoietic protoporphyria (EPP) is a rare autosomal dominant disorder of haeme biosynthesis resulting from a partial decrease in ferrochelatase (FECH) activity leading to excessive accumulation of protoporphyrin. Clinical manifestation normally requires coinheritance of a common hypomorphic FECH allele and a deleterious FECH mutation.

OBJECTIVE:

The aim of this study was to characterize the inheritance of a Chinese family with EPP at molecular level, by identification and analysis of FECH sequence variation, including the IVS3-48C polymorphisms.

METHODS:

Polymerase chain reaction amplification was employed to identify the FECH sequence variation, including the IVS3-48C polymorphism, in a Chinese EPP family and a matched control cohort.

RESULTS:

A splicing mutation in IVS3 + 1G-->A was identified in the proband as well as his symptomatic sister, cousin, his grandfather and his asymptomatic mother, but was absent in his father and grandmother. All the family members with overt photosensitivity carried the low-expressed allele IVS3-48C, which were absent in the asymptomatic EPP patients of this family.

CONCLUSION:

We described a novel splicing FECH mutation in a Chinese EPP family and analysed the hypomorphic IVS3-48C allele, which were believed to be responsible for generating the phenotypic symptoms in this family.

[Indexed for MEDLINE]

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