Menkes disease is due to deficiency of:
**Core Concept**
Menkes disease is a rare, X-linked recessive disorder characterized by copper deficiency, leading to impaired connective tissue, brain, and other organ function. This condition is caused by mutations in the ATP7A gene, which encodes a copper-transporting P-type ATPase responsible for maintaining copper homeostasis in the body.
**Why the Correct Answer is Right**
Menkes disease is caused by mutations in the ATP7A gene, leading to impaired copper transport across cell membranes. As a result, copper accumulates in lysosomes, causing cellular damage and oxidative stress. The ATP7A protein plays a crucial role in regulating copper levels by pumping excess copper out of cells and into the bloodstream for excretion.
**Why Each Wrong Option is Incorrect**
**Option A:** Zinc deficiency is associated with acrodermatitis enteropathica, a different genetic disorder.
**Option B:** Vitamin E deficiency is linked to ataxia with vitamin E deficiency, a distinct condition characterized by impaired vitamin E transport.
**Option C:** Manganese deficiency is not associated with a specific genetic disorder; manganese is an essential mineral required for enzyme function and bone health.
**Clinical Pearl / High-Yield Fact**
Menkes disease is a classic example of a genetic disorder caused by impaired ion transport, highlighting the importance of copper homeostasis in maintaining cellular function.
**Correct Answer: C. Manganese deficiency is not associated with Menkes disease.**