PORCN gene mutations and the protean nature of focal dermal hypoplasia

• Published in: British journal of dermatology (1951) Vol. 160; no. 5; pp. 1103 - 1109
• Main Authors: Clements, S.E., Mellerio, J.E., Holden, S.T., McCauley, J., McGrath, J.A.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.05.2009; Wiley-Blackwell
• Subjects: Acyltransferases; Adult; Biological and medical sciences; Dermatology; Diseases of the osteoarticular system; DNA Mutational Analysis; Female; focal dermal hypoplasia; Focal Dermal Hypoplasia - genetics; Focal Dermal Hypoplasia - pathology; Genotype; Goltz syndrome; Humans; Malformations and congenital and or hereditary diseases involving bones. Joint deformations; Medical sciences; Membrane Proteins - genetics; Pedigree; Phenotype; Point Mutation - genetics; PORCN gene; Wnt signalling; X Chromosome Inactivation - genetics; X‐linked dominant; Young Adult; Skin disease; Wnt signalling; Dermatology; Diseases of the osteoarticular system; PORCN gene; X-linked dominant; Dysostosis; Focal dermal hypoplasia; Mutation; Genetic disease; Goltz syndrome
• ISSN: 0007-0963; 1365-2133
• DOI: 10.1111/j.1365-2133.2009.09048.x

Summary Focal dermal hypoplasia (FDH) is an X‐linked dominant disorder featuring developmental abnormalities of ectodermal and mesodermal tissues. Pathogenic mutations in the PORCN gene (locus Xp11.23) were identified in 2007 and thus far 27 different mutations have been reported. PORCN encodes a putative O‐acyltransferase which facilitates secretion of Wnt proteins required for ectomesodermal tissue development. We investigated PORCN gene pathology and pattern of X‐chromosome inactivation analysis in two unrelated Caucasian female patients who presented with multiple developmental abnormalities consistent with FDH. We also reviewed the clinical and molecular data for all reported PORCN mutations and assessed genotype–phenotype correlation for sporadic and familial cases of FDH. DNA sequencing revealed two new PORCN gene mutations: p.W282X and c.74delG (p.G25fsX51). X‐chromosome inactivation analysis revealed a random pattern in one case but was uninformative in the other. Collectively, point/small mutations account for 24 out of the 29 PORCN mutations and are typically seen in sporadic cases; larger deletions are more common in familial cases. Identification of two new PORCN gene mutations confirms the importance of PORCN‐associated Wnt signalling in embryogenesis. Both new cases showed Blaschko‐linear dermal hypoplasia and extensive ectomesodermal abnormalities, including severe limb developmental anomalies and a giant cell tumour of bone in one patient. Clinical variability can be attributed to the degree of lyonization and postzygotic genomic mosaicism, which are important mechanisms in determining the clinical presentation.