ONLINE MUTATION REPORT
Molecular characterisation of six patients with prolidase deficiency: identification of the first small duplication in the prolidase gene and of a mutation generating symptomatic and asymptomatic outcomes within the same family
1 Department of Biochemistry "A Castellani", Section of Medicine and Pharmacy, University of Pavia, Pavia, Italy
2 Department of Clinical Genetics, Juliane Marie Centre, Copenhagen University Hospital, Copenhagen, Denmark
3 Department of Pediatrics Genetics, Marmara University Hospital, Istanbul, Turkey
4 Department of Biochemistry, GATA Haydapasa Training Hospital, Istanbul, Turkey
5 Unit of Rare Diseases, Department of Pediatrics, Gaslini Institute, Largo Gaslini 3, Genoa, Italy
Correspondence to:
Correspondence to:
A Forlino
Department of Biochemistry "A Castellani", Section of Medicine and Pharmacy, University of Pavia, Via Taramelli 3/B, 27100 Pavia, Italy; aforlino{at}unipv.it
Prolidase deficiency (PD) is a rare autosomal recessive connective tissue disorder caused by mutations in the prolidase gene. The PD patients show a wide range of clinical outcomes characterised mainly by intractable skin ulcers, mental retardation and recurrent respiratory infections. Here we describe five different PEPD mutations in six European patients. We identified two new PEPD mutant alleles: a 13 bp duplication in exon 8, which is the first reported duplication in the prolidase gene and a point mutation resulting in a change in amino acid E412, a highly conserved residue among different species. The E412K substitution is responsible for the first reported phenotypic variability within a family with severe and asymptomatic outcomes.
Abbreviations: PCR, polymerase chain reaction; PEPD, prolidase gene
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