Two novel mutations in the gene EDAR causing autosomal recessive hypohidrotic ectodermal dysplasia

• Published in: Orthodontics & craniofacial research Vol. 14; no. 3; pp. 156 - 159
• Main Authors: Naqvi, SK, Wasif, N, Javaid, H, Ahmad, W
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.08.2011
• Subjects: Adenine; Anhidrotic ectodermal dysplasia; Appendages; Child; chromosome 2; Chromosomes, Human, Pair 2 - genetics; Consanguinity; Cytosine; Dentistry; Dysplasia; Ectodermal Dysplasia, Hypohidrotic, Autosomal Recessive - genetics; Edar Receptor - genetics; Exons; Exons - genetics; gene EDAR; Genetic Linkage - genetics; Genetic markers; Genotyping; Genotyping Techniques; Hair; Heredity; Humans; hypohidrotic ectodermal dysplasia; Isoleucine - genetics; Linkage analysis; Microsatellite Repeats - genetics; Microsatellites; Missense mutation; Mutagenesis, Insertional - genetics; Mutation - genetics; Mutation, Missense - genetics; novel mutations; Nucleotide sequence; Pakistan; Pedigree; RNA Splice Sites - genetics; Sequence Analysis, DNA; Signal transduction; Splice junctions; Sweat; Threonine - genetics; Thymine; Valine - genetics; X chromosome; Young Adult; Pakistan
• ISSN: 1601-6335; 1601-6343
• DOI: 10.1111/j.1601-6343.2011.01521.x

To cite this article: 
Naqvi SK, Wasif N, Javaid H, Ahmad W:
Two novel mutations in the gene EDAR causing autosomal recessive hypohidrotic ectodermal dysplasia
Orthod Craniofac Res 2011;14:156–159 Structured Authors –  Naqvi SK, Wasif N, Javaid H, Ahmad W Introduction –  Hypohidrotic ectodermal dysplasia (HED) is a human heritable disorder characterized by sparse hair, reduced ability to sweat and hypodontia. The HED exhibits X‐linked, autosomal recessive and autosomal dominant mode of inheritance. Mutations in four genes including EDA, EDAR, EDARADD, and WNT10A are known to cause hypohidrotic and anhidrotic ectodermal dysplasia. Materials and methods –  Genotyping of both affected and normal individuals of two consanguineous Pakistani families (A, B), showing autosomal recessive HED, was carried out using microsatellite markers linked to EDAR gene on chromosome 2q11‐q13. To screen for mutations in the gene EDAR, all of its exons and splice junction were amplified and sequenced directly, using an automated DNA sequencer. Results –  Genotyping using microsatellite markers analysis showed linkage of the two families to gene EDAR on chromosome 2q11‐2q13. Subsequently, screening of all the 12 exons and splice junctions of gene EDAR revealed a novel missense mutation (c.1163T>C; p.Ile388Thr) in family A and a novel insertion mutation (c.1014insA; p.V339SfsX6) in family B. Conclusion –  Our findings extend the body of evidence supporting the role of EDAR signaling pathway as a powerful regulator of development of ectodermal appendages.