Menkes’ kinky hair disease occurs due to:
**Core Concept**
Menkes' kinky hair disease is a rare genetic disorder characterized by copper deficiency in the body, leading to impaired connective tissue structure due to the absence of copper-dependent enzymes.
**Why the Correct Answer is Right**
The disease is caused by mutations in the ATP7A gene, which encodes a copper-transporting ATPase responsible for copper delivery to various tissues, including the brain, liver, and connective tissue. This deficiency impairs the function of enzymes such as cytochrome c oxidase, leading to oxidative stress and tissue damage.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Menkes' disease is not associated with an excess of copper but rather a deficiency.
**Option B:** This option is incorrect because Wilson's disease is a distinct genetic disorder caused by mutations in the ATP7B gene, which leads to copper accumulation in the body, particularly in the liver and brain.
**Option C:** This option is incorrect because Menkes' disease is not caused by a deficiency of zinc but rather copper.
**Clinical Pearl / High-Yield Fact**
Menkes' disease is a classic example of a genetic disorder caused by mutations in a transport protein, highlighting the importance of copper homeostasis in maintaining tissue structure and function.
**Correct Answer: D. Deficiency of ATP7A protein causing impaired copper transport.**