Recurrent De Novo Mutations Affecting Residue Arg138 of Pyrroline-5-Carboxylate Synthase Cause a Progeroid Form of Autosomal-Dominant Cutis Laxa

Recurrent De Novo Mutations Affecting Residue Arg138 of Pyrroline-5-Carboxylate Synthase Cause a Progeroid Form of Autosomal-Dominant Cutis Laxa
Title:
Recurrent De Novo Mutations Affecting Residue Arg138 of Pyrroline-5-Carboxylate Synthase Cause a Progeroid Form of Autosomal-Dominant Cutis Laxa
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The American Journal of Human Genetics
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Publication Date:
27 August 2015
Citation:
Björn Fischer-Zirnsak, Nathalie Escande-Beillard, Jaya Ganesh, Yu Xuan Tan, Mohammed Al Bughaili, Angela E. Lin, Inderneel Sahai, Paulina Bahena, Sara L. Reichert, Abigail Loh, Graham D. Wright, Jaron Liu, Elisa Rahikkala, Eniko K. Pivnick, Asim F. Choudhri, Ulrike Krüger, Tomasz Zemojtel, Conny van Ravenswaaij-Arts, Roya Mostafavi, Irene Stolte-Dijkstra, Sofie Symoens, Leila Pajunen, Lihadh Al-Gazali, David Meierhofer, Peter N. Robinson, Stefan Mundlos, Camilo E. Villarroel, Peter Byers, Amira Masri, Stephen P. Robertson, Ulrike Schwarze, Bert Callewaert, Bruno Reversade, Uwe Kornak, Recurrent De Novo Mutations Affecting Residue Arg138 of Pyrroline-5-Carboxylate Synthase Cause a Progeroid Form of Autosomal-Dominant Cutis Laxa, The American Journal of Human Genetics, Volume 97, Issue 3, 3 September 2015, Pages 483-492, ISSN 0002-9297, http://dx.doi.org/10.1016/j.ajhg.2015.08.001.
Abstract:
Progeroid disorders overlapping with De Barsy syndrome (DBS) are collectively denoted as autosomal-recessive cutis laxa type 3 (ARCL3). They are caused by biallelic mutations in PYCR1 or ALDH18A1, encoding pyrroline-5-carboxylate reductase 1 and pyrroline-5-carboxylate synthase (P5CS), respectively, which both operate in the mitochondrial proline cycle. We report here on eight unrelated individuals born to non-consanguineous families clinically diagnosed with DBS or wrinkly skin syndrome. We found three heterozygous mutations in ALDH18A1 leading to amino acid substitutions of the same highly conserved residue, Arg138 in P5CS. A de novo origin was confirmed in all six probands for whom parental DNA was available. Using fibroblasts from affected individuals and heterologous overexpression, we found that the P5CS-p.Arg138Trp protein was stable and able to interact with wild-type P5CS but showed an altered sub-mitochondrial distribution. A reduced size upon native gel electrophoresis indicated an alteration of the structure or composition of P5CS mutant complex. Furthermore, we found that the mutant cells had a reduced P5CS enzymatic activity leading to a delayed proline accumulation. In summary, recurrent de novo mutations, affecting the highly conserved residue Arg138 of P5CS, cause an autosomal-dominant form of cutis laxa with progeroid features. Our data provide insights into the etiology of cutis laxa diseases and will have immediate impact on diagnostics and genetic counseling.
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ISSN:
0002-9297
1537-6605
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