**Core Concept**
Brugada syndrome is a genetic disorder characterized by abnormal electrocardiographic (ECG) findings and an increased risk of sudden cardiac death. It is primarily caused by mutations in genes that encode for cardiac sodium channels, leading to abnormal ion channel function.

**Why the Correct Answer is Right**
The most common mutation associated with Brugada syndrome is a loss-of-function mutation in the SCN5A gene, which encodes for the alpha subunit of the cardiac sodium channel. This mutation leads to a reduction in sodium channel function, resulting in abnormal depolarization of the heart muscle cells. The mutation affects the SCN5A gene's ability to encode a normal cardiac sodium channel, disrupting the normal electrical conduction system of the heart.

**Why Each Wrong Option is Incorrect**
* **Option A:** Mutations in the KCNH2 gene are associated with long QT syndrome, not Brugada syndrome. These mutations lead to abnormal potassium channel function and are not related to the sodium channel dysfunction seen in Brugada.
* **Option B:** Mutations in the KCNQ1 gene are associated with long QT syndrome and Jervell-Lange-Nielsen syndrome, not Brugada syndrome. These mutations lead to abnormal potassium channel function and are not related to the sodium channel dysfunction seen in Brugada.
* **Option C:** Mutations in the RYR2 gene are associated with catecholaminergic polymorphic ventricular tachycardia (CPVT), not Brugada syndrome. These mutations lead to abnormal calcium channel function and are not related to the sodium channel dysfunction seen in Brugada.

**Clinical Pearl / High-Yield Fact**
It's essential to recognize that Brugada syndrome can be triggered by certain medications, such as sodium channel blockers, which can worsen the underlying abnormal ion channel function.

**Correct Answer:** C.