RT Book, Section A1 Nieman, Elizabeth L. A1 Grange, Dorothy Katherine A2 Kang, Sewon A2 Amagai, Masayuki A2 Bruckner, Anna L. A2 Enk, Alexander H. A2 Margolis, David J. A2 McMichael, Amy J. A2 Orringer, Jeffrey S. SR Print(0) ID 1161348545 T1 Ectodermal Dysplasias T2 Fitzpatrick's Dermatology, 9e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9780071837798 LK accessmedicine.mhmedical.com/content.aspx?aid=1161348545 RD 2024/04/19 AB AT-A-GLANCEA group of inherited disorders characterized by developmental abnormalities in 2 or more ectodermal structures.These include hair, teeth, nails, and sebaceous and sweat glands.There may be abnormalities in nonectodermal structures and functions.Distinction is based on clinical features, mode of inheritance, and molecular/genetic findings.Clinically distinct disorders may be due to different mutations in the same gene (allelic heterogeneity), and clinically similar conditions may be due to mutations in different genes (locus heterogeneity).