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01-09-2012 | Original Article

Understanding pyrroline-5-carboxylate synthetase deficiency: clinical, molecular, functional, and expression studies, structure-based analysis, and novel therapy with arginine

Authors: Diego Martinelli, Johannes Häberle, Vicente Rubio, Cecilia Giunta, Ingrid Hausser, Rosalba Carrozzo, Nadine Gougeard, Clara Marco-Marín, Bianca M. Goffredo, Maria Chiara Meschini, Elsa Bevivino, Sara Boenzi, Giovanna Stefania Colafati, Francesco Brancati, Matthias R. Baumgartner, Carlo Dionisi-Vici

Published in: Journal of Inherited Metabolic Disease | Issue 5/2012

Abstract

Δ¹-Pyrroline-5-carboxylate synthetase (P5CS) catalyzes the first two steps of ornithine/proline biosynthesis. P5CS deficiency has been reported in three families, with patients presenting with cutis/joint laxity, cataracts, and neurodevelopmental delay. Only one family exhibited metabolic changes consistent with P5CS deficiency (low proline/ornithine/citrulline/arginine; fasting hyperammonemia). Here we report a new P5CS-deficient patient presenting the complete clinical/metabolic phenotype and carrying p.G93R and p.T299I substitutions in the γ-glutamyl kinase (γGK) component of P5CS. The effects of these substitutions are (1) tested in mutagenesis/functional studies with E.coli γGK, (2) rationalized by structural modelling, and (3) reflected in decreased P5CS protein in patient fibroblasts (shown by immunofluorescence). Using optical/electron microscopy on skin biopsy, we show collagen/elastin fiber alterations that may contribute to connective tissue laxity and are compatible with our angio-MRI finding of kinky brain vessels in the patient. MR spectroscopy revealed decreased brain creatine, which normalized after sustained arginine supplementation, with improvement of neurodevelopmental and metabolic parameters, suggesting a pathogenic role of brain creatine decrease and the value of arginine therapy. Morphological and functional studies of fibroblast mitochondria show that P5CS deficiency is not associated with the mitochondrial alterations observed in Δ¹-pyrroline-5-carboxylate reductase deficiency (another proline biosynthesis defect presenting cutis laxa and neurological alterations).

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Title: Understanding pyrroline-5-carboxylate synthetase deficiency: clinical, molecular, functional, and expression studies, structure-based analysis, and novel therapy with arginine
Authors: Diego Martinelli
Johannes Häberle
Vicente Rubio
Cecilia Giunta
Ingrid Hausser
Rosalba Carrozzo
Nadine Gougeard
Clara Marco-Marín
Bianca M. Goffredo
Maria Chiara Meschini
Elsa Bevivino
Sara Boenzi
Giovanna Stefania Colafati
Francesco Brancati
Matthias R. Baumgartner
Carlo Dionisi-Vici
Publication date: 01-09-2012
Publisher: Springer Netherlands
Published in: Journal of Inherited Metabolic Disease / Issue 5/2012
Print ISSN: 0141-8955
Electronic ISSN: 1573-2665
DOI: https://doi.org/10.1007/s10545-011-9411-8

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