Abstract
Cranio-osteoarthropathy, clinically classified as a variant of primary hypertrophic osteoarthropathy, is a very rare autosomal-recessive condition characterized by delayed closure of the cranial sutures and fontanels, digital clubbing, arthropathy, and periostosis. Recently, mutations in the gene HPGD, which encodes the NAD+-dependent 15-hydroxyprostaglandin dehydrogenase, were reported in four families affected with primary hypertrophic osteoarthropathy and one family with autosomal-recessive isolated nail clubbing. We report the clinical and molecular findings in four patients from two families affected with cranio-osteoarthropathy and one family with isolated, autosomal dominant digital clubbing. Genome-wide homozygosity mapping identified a locus for cranio-osteoarthropathy harboring the HPGD gene in one affected family. We detected two novel homozygous mutations in HPGD in these families: a missense mutation affecting the NAD+ binding motif and a frameshift mutation. The clinical presentation in our patients was variable. Digital clubbing and hyperhidrosis were present in all cases. Delayed closure of the cranial sutures and fontanels, periostosis, and arthropathy were not consistent clinical features. No HPGD mutation was detected in a familial case of autosomal dominant isolated digital clubbing. The failure to identify any mutation in a family with an autosomal dominant type of isolated digital clubbing suggests that HPGD is not the major gene for this condition.
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Acknowledgements
We are grateful to all patients and their families for their collaboration. We thank FAM Hennekam for performing genealogical studies in family 2, RCM Hennekam and J Kuehnisch for helpful discussion throughout the project, and P Meinecke for critically reading the paper. The SNP typing was performed by the Microarray Facility in Tübingen.
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Seifert, W., Beninde, J., Hoffmann, K. et al. HPGD mutations cause cranioosteoarthropathy but not autosomal dominant digital clubbing. Eur J Hum Genet 17, 1570–1576 (2009). https://doi.org/10.1038/ejhg.2009.104
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DOI: https://doi.org/10.1038/ejhg.2009.104
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