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  • Title: Pachydermoperiostosis in an African patient caused by a Chinese/Japanese SLCO2A1 mutation-case report and review of literature.
    Author: Madruga Dias JA, Rosa RS, Perpétuo I, Rodrigues AM, Janeiro A, Costa MM, Gaião L, Pereira da Silva JA, Fonseca JE, Miltenberger-Miltenyi G.
    Journal: Semin Arthritis Rheum; 2014 Feb; 43(4):566-9. PubMed ID: 24012041.
    Abstract:
    OBJECTIVES: Pachydermoperiostosis is a rare clinical entity characterized by skin thickening of the forehead, eyelids, and hands, digital clubbing, and periostosis. Two genes have been associated, HPGD and recently SLCO2A1. We present a detailed clinical and genetic description of an African pachydermoperiostosis patient with a SLCO2A1 mutation. METHODS: Standard clinical and laboratory evaluation was carried out. Genetic screening was done with PCR followed by direct sequencing. We discuss the clinical features and known mutations of previously reported cases identified through a PubMed literature review. RESULTS: The clinical findings showed special features, including exuberant knee effusions and an extraordinary good response on surgery of the blepharoptosis. We found a splice site mutation in the SLCO2A1 gene in homozygous form: c.940+1G>A. This mutation was previously reported only in 1 Chinese and 3 Japanese cases and was considered as a founder mutation in Japan. Beside our case, only one other patient in the literature carried this mutation in homozygous condition, but with different main clinical symptoms. CONCLUSIONS: Our case demonstrates phenotypic heterogeneity of PDP even between homozygous carriers of the same mutation, suggesting further modifiers. Besides, it shows that this rare SLCO2A1 mutation is not exclusively present in East-Asia, but can occur in various ethnicities, with different origin, thus the incidence is probably underestimated.
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