Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/57689
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Type: Journal article
Title: Epilepsy and mental retardation limited to females with PCDH19 mutations can present de novo or in single generation families
Author: Hynes, K.
Tarpey, P.
Dibbens, L.
Bayly, M.
Berkovic, S.
Smith, R.
Al Raisi, Z.
Turner, S.
Brown, N.
Desai, T.
Haan, E.
Turner, G.
Christodoulou, J.
Leonard, H.
Gill, D.
Stratton, M.
Gecz, J.
Scheffer, I.
Citation: Journal of Medical Genetics, 2010; 47(3):211-216
Publisher: British Med Journal Publ Group
Issue Date: 2010
ISSN: 0022-2593
1468-6244
Statement of
Responsibility: 
Kim Hynes, Patrick Tarpey, Leanne M. Dibbens, Marta A. Bayly, Samuel F. Berkovic, Raffaella Smith, Zahyia Al Raisi, Samantha J. Turner, Natasha J. Brown, Tarishi D. Desai, Eric Haan, Gillian Turner, John Christodoulou, Helen Leonard, Deepak Gill, Michael R. Stratton, Jozef Gecz, Ingrid E. Scheffer
Abstract: Background: Epilepsy and mental retardation limited to females (EFMR) is an intriguing X-linked disorder affecting heterozygous females and sparing hemizygous males. Mutations in the protocadherin 19 (PCDH19) gene have been identified in seven unrelated families with EFMR. Methods and results: Here, we assessed the frequency of PCDH19 mutations in individuals with clinical features which overlap those of EFMR. We analysed 185 females from three cohorts: 42 with Rett syndrome who were negative for MECP2 and CDKL5 mutations, 57 with autism spectrum disorders, and 86 with epilepsy with or without intellectual disability. No mutations were identified in the Rett syndrome and autism spectrum disorders cohorts suggesting that despite sharing similar clinical characteristics with EFMR, PCDH19 mutations are not generally associated with these disorders. Among the 86 females with epilepsy (of whom 51 had seizure onset before 3 years), with or without intellectual disability, we identified two (2.3%) missense changes. One (c.1671C→G, p.N557K), reported previously without clinical data, was found in two affected sisters, the first EFMR family without a multigenerational family history of affected females. The second, reported here, is a novel de novo missense change identified in a sporadic female. The change, p.S276P, is predicted to result in functional disturbance of PCDH19 as it affects a highly conserved residue adjacent to the adhesion interface of EC3 of PCDH19. Conclusions: This de novo PCDH19 mutation in a sporadic female highlights that mutational analysis should be considered in isolated instances of girls with infantile onset seizures and developmental delay, in addition to those with the characteristic family history of EFMR.
Keywords: Humans; Epilepsy; Mental Retardation, X-Linked; Cadherins; Pedigree; Family; Family Characteristics; Child Development Disorders, Pervasive; Amino Acid Sequence; Base Sequence; Sequence Homology, Amino Acid; Mutation; Molecular Sequence Data; Adult; Child; Female
Description: First published online 14 September 2009
RMID: 0020092403
DOI: 10.1136/jmg.2009.068817
Appears in Collections:Paediatrics publications

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