**Core Concept:** Acrodermatitis Enteropathica (AE) is a rare autosomal recessive disorder characterized by impaired zinc absorption leading to dermatitis, alopecia, and impaired growth. Zinc is essential for skin integrity, hair growth, and immune function.

**Why the Correct Answer is Right:** Acrodermatitis Enteropathica is caused by a genetic mutation in the SLC39A4 gene, which results in a dysfunctional zinc transporter protein called ZIP4. This leads to reduced zinc absorption from the gut, causing the characteristic symptoms seen in AE. Zinc is crucial in maintaining skin integrity, hair growth, and immune function.

**Why Each Wrong Option is Incorrect:**

A. False: AE is not associated with copper deficiency or hypercalcemia. Copper and calcium are unrelated to the pathogenesis of AE.

B. False: AE is a genetic disorder caused by a mutation in the SLC39A4 gene, not due to an autoimmune condition.

C. False: AE is characterized by impaired zinc absorption, not hyperabsorption as stated in option C.

D. False: AE is not caused by a deficiency in the SLC39A4 gene, but by a dysfunction in the ZIP4 protein, which is encoded by the SLC39A4 gene.

**Clinical Pearl:** Ensuring adequate zinc intake is crucial in managing AE patients, as supplementation can significantly improve symptoms and growth. Zinc plays a vital role in wound healing, immune function, and protein synthesis. Zinc supplementation should be guided by serum zinc levels and monitored to prevent toxicity.

**Correct Answer:** D. Acrodermatitis Enteropathica is caused by a deficiency in the SLC39A4 gene, which encodes the ZIP4 protein involved in zinc absorption. This leads to impaired zinc absorption, causing the clinical features seen in AE patients.