**Core Concept**
Occulo-cutaneous albinism is a group of rare genetic disorders characterized by the reduction or complete absence of melanin production in the skin, hair, and eyes. This condition arises due to mutations in genes responsible for melanin synthesis, leading to impaired tyrosinase activity.

**Why the Correct Answer is Right**
The correct answer is associated with mutations in the TYR gene, which encodes the enzyme tyrosinase. Tyrosinase is crucial for the conversion of tyrosine to melanin, a process that is essential for pigmentation. Individuals with occulo-cutaneous albinism have reduced or absent tyrosinase activity, resulting in the characteristic lack of pigmentation. This enzymatic deficiency leads to the accumulation of intermediate metabolites, such as dopa and dopachrome, which accumulate in the skin and eyes.

**Why Each Wrong Option is Incorrect**
**Option A:** Not relevant to occulo-cutaneous albinism.
**Option B:** Associated with vitiligo, a condition characterized by loss of melanin-producing cells in the skin.
**Option C:** Not directly associated with occulo-cutaneous albinism.

**Clinical Pearl / High-Yield Fact**
It is essential to distinguish occulo-cutaneous albinism from other conditions that affect pigmentation, such as vitiligo, which is characterized by the loss of melanocytes rather than a deficiency in melanin synthesis.

**Correct Answer: D. Tyrosinase deficiency.**