Dilated cardiomyopathy, gene altered is?
**Core Concept**
Dilated cardiomyopathy (DCM) is a condition characterized by the enlargement and weakening of the heart muscle, leading to impaired cardiac function. It is often associated with genetic mutations affecting proteins involved in cardiac structure and function.
**Why the Correct Answer is Right**
The most common genetic alterations associated with DCM involve the genes encoding for sarcomeric proteins, which are essential for cardiac muscle contraction. Mutations in genes such as **MYH7**, **MYBPC3**, and **TNNT2** can disrupt normal cardiac function, leading to DCM. These mutations can cause abnormal sarcomere assembly, leading to impaired cardiac contractility and dilation.
**Why Each Wrong Option is Incorrect**
**Option A:** While mutations in the **LMNA** gene are associated with other forms of cardiomyopathy, such as Emery-Dreifuss muscular dystrophy, they are not typically associated with DCM.
**Option B:** Mutations in the **DSP** gene are associated with arrhythmogenic right ventricular cardiomyopathy (ARVC), a distinct form of cardiomyopathy characterized by fibrofatty replacement of the right ventricular myocardium.
**Option C:** Mutations in the **TTR** gene are associated with transthyretin amyloidosis, a condition characterized by the deposition of amyloid fibrils in the heart, leading to restrictive cardiomyopathy.
**Clinical Pearl / High-Yield Fact**
Genetic testing for DCM can identify individuals with a high risk of developing the condition, allowing for early intervention and potentially altering the course of the disease.
**Correct Answer: C. TTR**