Acrodermatitis enteropathica is an autosomal recessive metabolic disorder affecting the uptake of zinc, characterized by periorificial (around the natural orifices) and acral (in the limbs) dermatitis, alopecia (loss of hair), and diarrhea.
Similar features may be present in acquired zinc deficiency. This disease also is related to deficiency of zinc due to congenital causes.
Other names for acrodermatitis enteropathica include:
A mutation of the SLC39A4 gene on Chromosome 8 q24.3 is responsible for the disorder. The SLC39A4 gene encodes a transmembrane protein that serves as a zinc uptake protein. The features of the disease usually start manifesting as an infant is weaned from breast milk. This has led some scientists to suspect that human milk contains a beneficial substance that helps uptake of zinc and prevents the disease from being manifested while an infant is on breast milk.
Features of acrodermatitis enteropathica start appearing in the first few months of life, as the infant discontinues breast milk. There are erythematous
patches and plaques of dry, scaly skin. The lesions may appear eczematous
, or may evolve further into crusted vesicles
. The lesions are frequent around the mouth and anus
, and also in hands, feet and scalp
There may be suppurative inflammation
of the nail fold
surrounding the nail plate
- known as paronychia
- loss of hair from scalp, eyebrows and eyelashes may occur. The skin lesions may be secondarily infected by bacteria
such as Staphylococcus aureus
like Candida albicans
. These skin lesions are accompanied by diarrhea.
Without treatment, the disease is fatal and affected individuals may die within a few years. There is no cure for the condition. Treatment includes lifelong dietary zinc
supplementation in the range of greater than 1-2 mg
of bodyweight per day.