A novel homozygous splice site mutation in the HPGD gene causes mild primary hypertrophic osteoarthropathy

Lorenzo Sinibaldi, Ghita Harifi, Irene Bottillo, Miriam Iannicelli, Selma El Hassani, Francesco Brancati, Bruno Dallapiccola

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: Homozygous mutations in HPGD gene, encoding 15-hydroxyprostaglandin dehydrogenase, have recently been associated with primary hypertrophic osteoarthropathy (PHO). So far, only 7 HPGD alterations are known. In order to expand this mutational spectrum and better delineate the HPGD-related phenotype, we report the clinical and molecular characterisation of a 13-year-old boy and compare his features to known mutated patients. Methods: The HPGD gene exons 1-7 and exon-intron junctions were analysed by direct sequencing. Previously published HPGD-mutated patients were systematically reviewed based on the original clinical description. Results: A novel homozygous c.217+1G>A mutation affecting the obligatory donor splice site of HPGD exon 2 was identified in our proband who showed a mild form of PHO. Review of HPGD-mutated patients outlined all patients manifested digital clubbing, periostosis and acro-osteolysis. Hyperhidrosis (92%), arthralgia (65%) and eczema (33%) were variably associated features. Pachydermia (54%) was mild and mostly limited to palms and sole; cutis vertigis gyrata, blepharoptosis and severe skin thickening were never observed. Besides digital clubbing, PHO infants often presented patent ductus arteriosus (PDA) (32%) and delayed cranial sutures closure (55%). Conclusion: The present findings broaden the allelic spectrum of HPGD gene to include a novel c.217+1G>A mutation. Mutated patients display a homogeneous phenotype mainly consisting in digital clubbing, periostosis, acro-osteolysis, hyperhidrosis and mild pachydermia. Earliest manifestations include delayed closure of the cranial sutures and PDA. In conclusion, the information reported herein would facilitate the diagnosis of PHO due to HPGD mutations.

Original languageEnglish
Pages (from-to)153-157
Number of pages5
JournalClinical and Experimental Rheumatology
Volume28
Issue number2
Publication statusPublished - Mar 2010

Keywords

  • 15-hydroxyprostaglandindehydrogenase
  • Digital clubbing
  • HPGD
  • Pachydermoperiostosis
  • Primary hypertrophic osteoarthropathy

ASJC Scopus subject areas

  • Rheumatology
  • Immunology
  • Immunology and Allergy

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