Single amino acid charge switch defines clinically distinct proline-serine-threonine phosphatase-interacting protein 1 (PSTPIP1)-associated inflammatory diseases.
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| Abstract | BACKGROUND:
Hyperzincemia and hypercalprotectinemia (Hz/Hc) is a distinct autoinflammatory entity involving extremely high serum concentrations of the proinflammatory alarmin myeloid-related protein (MRP) 8/14 (S100A8/S100A9 and calprotectin). OBJECTIVE: We sought to characterize the genetic cause and clinical spectrum of Hz/Hc. METHODS:
Proline-serine-threonine phosphatase-interacting protein 1 (PSTPIP1) gene sequencing was performed in 14 patients with Hz/Hc, and their clinical phenotype was compared with that of 11 patients with pyogenic arthritis, pyoderma gangrenosum, and acne (PAPA) syndrome. PSTPIP1-pyrin interactions were analyzed by means of immunoprecipitation and Western blotting. A structural model of the PSTPIP1 dimer was generated. Cytokine profiles were analyzed by using the multiplex immunoassay, and MRP8/14 serum concentrations were analyzed by using an ELISA. RESULTS: Thirteen patients were heterozygous for a missense mutation in the PSTPIP1 gene, resulting in a p.E250K mutation, and 1 carried a mutation resulting in p.E257K. Both mutations substantially alter the electrostatic potential of the PSTPIP1 dimer model in a region critical for protein-protein interaction. Patients with Hz/Hc have extremely high MRP8/14 concentrations (2045 ± 1300 μg/mL) compared with those with PAPA syndrome (116 ± 74 μg/mL) and have a distinct clinical phenotype. A specific cytokine profile is associated with Hz/Hc. Hz/Hc mutations altered protein binding of PSTPIP1, increasing interaction with pyrin through phosphorylation of PSTPIP1. CONCLUSION: Mutations resulting in charge reversal in the y-domain of PSTPIP1 (E→K) and increased interaction with pyrin cause a distinct autoinflammatory disorder defined by clinical and biochemical features not found in patients with PAPA syndrome, indicating a unique genotype-phenotype correlation for mutations in the PSTPIP1 gene. This is the first inborn autoinflammatory syndrome in which inflammation is driven by uncontrolled release of members of the alarmin family.
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| Authors | Dirk Holzinger, Selina Kathleen Fassl, Wilco de Jager, Peter Lohse, Ute F Röhrig, Marco Gattorno, Alessia Omenetti, Sabrina Chiesa, Francesca Schena, Judith Austermann, Thomas Vogl, Douglas B Kuhns, Steven M Holland, Carlos Rodríguez-Gallego, Ricardo López-Almaraz, Juan I Arostegui, Elena Colino, Rosa Roldan, Smaragdi Fessatou, Bertrand Isidor, Sylvaine Poignant, Koichi Ito, Hans-Joerg Epple, Jonathan A Bernstein, Michael Jeng, Jennifer Frankovich, Geraldina Lionetti, Joseph A Church, Peck Y Ong, Mona LaPlant, Mario Abinun, Rod Skinner, Venetia Bigley, Ulrich J Sachs, Claas Hinze, Esther Hoppenreijs, Jan Ehrchen, Dirk Foell, Jae Jin Chae, Amanda Ombrello, Ivona Aksentijevich, Cord Sunderkoetter, Johannes Roth |
| Journal | The Journal of allergy and clinical immunology (J Allergy Clin Immunol) Vol. 136 Issue 5 Pg. 1337-45 (Nov 2015) ISSN: 1097-6825 [Electronic] United States |
| PMID | 26025129 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, N.I.H., Intramural, Research Support, Non-U.S. Gov't) |
| Copyright | Copyright © 2015 American Academy of Allergy, Asthma & Immunology. All rights reserved. |
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