different types of ectodermal dysplasia
The pattern of inheritance differs for the different types of ectodermal dysplasias. The most common type of ectodermal dysplasia, hypohidrotic ectodermal dysplasia (HED) is caused by a mutation in the ectodysplasin-A (EDA) gene. The mutated EDA gene disrupts the normal structure and function of a number of ectodermal structures.