Prenatal diagnosis of anhidrotic ectodermal dysplasia

Area of Science:

• Medical Genetics
• Dermatology
• Prenatal Diagnosis

Background:

• X-linked anhidrotic ectodermal dysplasia (AED) is a genetic disorder affecting skin appendages.
• Family history revealed affected males and mildly symptomatic females, suggesting X-linked inheritance.

Observation:

• Fetal skin biopsies were obtained via fetoscopy at 20 weeks gestation.
• Light and electron microscopy were used to examine fetal skin structure.
• Affected family members showed no ultrastructural abnormalities in lesional skin.

Findings:

• All fetal skin biopsies from the fetus at risk lacked skin appendages, including hair follicles, sebaceous glands, and sweat glands.
• This absence of pilosebaceous follicles and underdeveloped sweat glands served as a diagnostic criterion.
• Histological examination confirmed the complete absence of skin appendages, distinguishing it from 61 unaffected fetuses.

Implications:

• Successful prenatal diagnosis of AED enables informed reproductive decisions.
• Early diagnosis through fetal skin biopsy can prevent the birth of severely affected individuals.
• This diagnostic approach aids in genetic counseling for families with a history of AED.