**Core Concept:** The Tuberous Sclerosis Complex (TSC) is a genetic disorder caused by mutations in either the TSC1 or TSC2 genes. These genes play a crucial role in the regulation of the mTOR pathway, which is essential for cell growth, proliferation, and differentiation. The TSC1 gene, in particular, is involved in the pathogenesis of neurocutaneous syndromes such as Tuberous Sclerosis.

**Why the Correct Answer is Right:** The TSC1 gene is one of the two genes responsible for Tuberous Sclerosis Complex. It encodes a protein called hamartin, which inhibits the mTOR pathway, a key regulator of cell growth and proliferation. Mutations in the TSC1 gene lead to the loss of hamartin function, causing uncontrolled cell growth and development of characteristic lesions in various organs, including the brain, kidneys, and skin.

**Why Each Wrong Option is Incorrect:**

A. This option refers to TSC2, which is the other gene responsible for Tuberous Sclerosis Complex. The TSC1 gene is the correct answer.
B. This option does not mention the TSC1 gene and focuses on the TSC2 gene. The correct answer is TSC1.
C. This option refers to a different neurocutaneous syndrome called Neurofibromatosis, which is unrelated to TSC1.
D. Although the mTOR pathway is involved in Tuberous Sclerosis Complex, this option does not specifically mention the TSC1 gene.

**Clinical Pearl:** Understanding the role of TSC1 and TSC2 genes in Tuberous Sclerosis Complex is essential for accurately diagnosing and managing patients with this genetic disorder. Knowledge of these genes can help identify individuals at risk and guide therapeutic interventions, as targeted therapies are available for TSC patients.