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EDARADD gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

EDARADD gene

The EDARADD gene provides instructions for an adapter protein that assists the ectodysplasin A receptor in signaling, which is vital for the development of hair, teeth, and sweat glands.

Normal Function

The EDARADD gene provides instructions for making a protein called the EDAR-associated via death domain (EDARADD) protein. This protein is part of a signaling pathway that plays an important role in development before birth. Specifically, it is critical for interactions between two embryonic cell layers called the ectoderm and the mesoderm. In the early embryo, these cell layers form the basis for many of the body's organs and tissues. Ectoderm-mesoderm interactions are essential for the formation of several structures that arise from the ectoderm, including the skin, hair, nails, teeth, and sweat glands.

The EDARADD protein interacts with another protein, called the ectodysplasin A receptor, which is produced from the EDAR gene. This interaction occurs at a region called the death domain that is present in both proteins. The EDARADD protein acts as an adapter, which means it assists the ectodysplasin A receptor in triggering chemical signals within cells. These signals affect cell activities such as division, growth, and maturation. Starting before birth, this signaling pathway controls the formation of ectodermal structures such as hair follicles, sweat glands, and teeth.

Health Conditions Related to Genetic Changes

Hypohidrotic ectodermal dysplasia

Fewer than 10 mutations in the EDARADD gene have been found to cause hypohidrotic ectodermal dysplasia, the most common form of ectodermal dysplasia. Starting before birth, ectodermal dysplasias result in the abnormal development of the skin, hair, nails, teeth, and sweat glands. Hypohidrotic ectodermal dysplasia is characterized by a reduced ability to sweat (hypohidrosis), sparse scalp and body hair (hypotrichosis), and several missing teeth (hypodontia) or teeth that are malformed. EDARADD gene mutations are an infrequent cause of hypohidrotic ectodermal dysplasia, accounting for only about 1 percent of all cases.

Most of the EDARADD gene mutations associated with hypohidrotic ectodermal dysplasia change single protein building blocks (amino acids) in the receptor protein. These changes occur in or near the death domain, preventing the EDARADD protein from interacting effectively with the ectodysplasin A receptor. As a result, the receptor cannot trigger the signals needed for ectoderm-mesoderm interactions in early development. Without these signals, hair follicles, teeth, sweat glands, and other ectodermal structures do not form properly, which leads to the characteristic features of hypohidrotic ectodermal dysplasia.

Other Names for This Gene

  • ectodysplasia A receptor associated death domain
  • ectodysplasin A receptor associated adapter protein
  • EDAD_HUMAN
  • EDAR-associated death domain

Frequently Asked Questions

Because sweating is limited, skin can become dry and prone to fissuring or bacterial colonization. Effective skin‑care includes: (1) daily gentle cleansing with mild, fragrance‑free cleansers; (2) immediate application of thick, emollient moisturizers (e.g., petrolatum‑based ointments) after bathing to lock in moisture; (3) use of humidifiers in dry indoor environments; (4) avoidance of hot water baths and harsh soaps that strip lipids; (5) regular inspection of skin folds and feet for maceration or cracks, treating any early signs of infection with topical antibiotics; and (6) prompt medical evaluation for any cellulitis‑like redness or swelling. These measures reduce discomfort and lower the risk of secondary infections.
Yes. If a pathogenic EDARADD variant has been identified in a family, targeted prenatal testing can be performed via chorionic villus sampling (10–12 weeks) or amniocentesis (15–18 weeks) to determine fetal genotype. Additionally, pre‑implantation genetic testing for monogenic disorders (PGT‑M) is available for couples undergoing in‑vitro fertilization, allowing selection of embryos without the disease‑causing alleles. Genetic counseling should be offered before any testing to discuss accuracy, risks, and ethical considerations.
Dental anomalies (hypodontia, conical teeth, enamel defects) are frequent. Recommended care includes: (1) early referral to a pediatric dentist by age 6 months; (2) regular dental exams every 3–4 months to monitor eruption patterns; (3) use of fluoride varnish or prescription toothpaste to strengthen enamel; (4) consideration of removable or fixed prosthetic appliances to maintain space for permanent teeth; and (5) coordination with orthodontists for long‑term alignment planning. Early intervention improves chewing function, speech development, and self‑esteem.
Both EDAR and EDARADD pathogenic variants most often follow an autosomal‑recessive pattern, meaning two defective copies are required for disease. However, EDARADD mutations are less common and tend to produce a milder phenotype when heterozygous carriers are identified, whereas some EDAR mutations can occasionally act in a dominant‑negative manner. In practice, the counseling for families with an EDARADD‑related case emphasizes the 25 % recurrence risk for each pregnancy when both parents are carriers.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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