The first two authors contributed equally to this work and should be considered joint first authors.
Experimental dermatology ● Original article
A novel splice-site mutation in the AAGAB gene segregates with hereditary punctate palmoplantar keratoderma and congenital dysplasia of the hip in a large family
Article first published online: 2 DEC 2013
© 2013 British Association of Dermatologists
Clinical and Experimental Dermatology
Volume 39, Issue 2, pages 182–186, March 2014
How to Cite
Eytan, O., Sarig, O., Israeli, S., Mevorah, B., Basel-Vanagaite, L. and Sprecher, E. (2014), A novel splice-site mutation in the AAGAB gene segregates with hereditary punctate palmoplantar keratoderma and congenital dysplasia of the hip in a large family. Clinical and Experimental Dermatology, 39: 182–186. doi: 10.1111/ced.12213
Conflict of interest: None declared.
- Issue published online: 13 FEB 2014
- Article first published online: 2 DEC 2013
- Manuscript Accepted: 28 APR 2013
Palmoplantar keratoderma punctata (PPKP) is a heterogeneous group of disorders characterized by hyperkeratotic papules occurring over the palms and soles during adolescence. PPKP type 1, also known as PPKP Buschke–Fischer–Brauer type, was recently found to result from mutations in the AAGAB gene, encoding the p34 protein. PPKP type 1 is usually not associated with extracutaneous features.
To investigate a large family in which PPKP1 was present in association with congenital dysplasia of the hip (CDH).
A combination of direct sequencing of candidate genes and reverse-transcription PCR was used to identify the molecular basis underlying the clinical features displayed by the patients.
Direct sequencing showed a novel intronic mutation in AAGAB, which was found to cosegregate with PPKP and CDH throughout the family. The mutation was found to result in aberrant RNA splicing, leading to exon 4 skipping.
This observation suggests either the existence of a CDH-associated gene in the vicinity of AAGAB, or a hitherto unrecognized role for p34 during skeletal development.