**Core Concept**
Gyrate atrophy is a rare, inherited disorder characterized by progressive chorioretinal degeneration, leading to visual impairment. This condition is caused by mutations in the OAT gene, which encodes for the enzyme ornithine aminotransferase.

**Why the Correct Answer is Right**
Gyrate atrophy is primarily associated with mutations in the OAT gene, resulting in a deficiency of ornithine aminotransferase. This enzyme plays a crucial role in the breakdown of ornithine, an amino acid in the urea cycle. The deficiency leads to increased levels of ornithine in the blood, which is toxic to the retina, causing progressive chorioretinal degeneration.

**Why Each Wrong Option is Incorrect**
**Option A:** Gyrate atrophy is caused by mutations in the OAT gene, not the OTC gene, which is associated with ornithine transcarbamylase deficiency.
**Option B:** The condition is not primarily associated with retinitis pigmentosa, although some patients may develop similar symptoms.
**Option C:** Gyrate atrophy is not a form of Leber's congenital amaurosis, a distinct inherited disorder of the retina.

**Clinical Pearl / High-Yield Fact**
Gyrate atrophy is a rare, autosomal recessive disorder, and a family history can be a key factor in diagnosis. Patients with gyrate atrophy may also exhibit elevated levels of ornithine in the blood, which can be used as a diagnostic marker.

**Correct Answer: B. Gyrate atrophy is primarily associated with mutations in the OAT gene, not retinitis pigmentosa.**