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Bashyam, M.D. and Chaudhary, A.K. and Reddy, E.C. and Reddy, V. and Acharya, V. and Nagarajaram, H.A. and Radha Rama Devi, A. and Bashyam, L. and Dalal, Ashwin and Gupta, N. and Kabra, M. and Agarwal, Meenal and Phadke, S.R. and Tainwala, R. and Kumar, R. and Hariharan, S.V. (2012) A founder ectodysplasin A receptor (EDAR) mutation results in a high frequency of the autosomal recessive form of hypohidrotic ectodermal dysplasia in India. British Journal of Dermatology, 166 (4). pp. 819-829. ISSN 0007-0963

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BACKGROUND: Hypohidrotic/anhidrotic ectodermal dysplasia (HED) is a rare Mendelian disorder affecting ectodermal tissues. The disease is primarily caused by inactivation of any one of three genes, namely ectodysplasin A1 (EDA-A1), which encodes a ligand belonging to the tumour necrosis factor (TNF) superfamily; ectodysplasin A receptor (EDAR), encoding the EDA-A1 receptor and ectodysplasin A receptor-associated death domain (EDARADD), encoding an adaptor protein. X-linked recessive (EDA-A1), the predominant form of HED, as well as autosomal recessive and dominant (EDAR and EDARADD) inheritance patterns have been identified in affected families. OBJECTIVES: To determine the common genes causing HED in India. METHODS: We performed mutation analysis on 26 HED families from India (including 30 patients). In addition, we carried out sequence and structural analysis of missense/nonsense and insertion/deletion mutations. RESULTS: Among the 26 families analysed, disease-causing EDAR mutations were identified in 12 (46%) while EDA-A1 mutations were detected in 11 (42%). Four novel mutations in EDAR and five in EDA-A1 were identified. More importantly, a possible founder EDAR mutation, namely c.1144G>A, was identified in five independent families, thus accounting for about one-fifth of affected families in whom mutation was detected. A majority of EDA-A1 mutations localized to the TNF-like domain while the location of EDAR mutations was more widespread. CONCLUSIONS: This is the first report of a founder EDAR mutation and of a significantly high frequency of autosomal recessive HED.

Item Type: Article
Depositing User: Dr P Divakar
Date Deposited: 04 Sep 2015 10:53
Last Modified: 14 Sep 2017 12:46
URI: http://cdfd.sciencecentral.in/id/eprint/476

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