Cat eye syndrome is-
**Core Concept**
Cat eye syndrome is a rare chromosomal disorder characterized by an imbalance of genetic material, specifically a deletion of part of chromosome 22. This deletion leads to various clinical features, including ocular, auricular, and cardiovascular anomalies.
**Why the Correct Answer is Right**
The deletion of chromosome 22q11.2, also known as the DiGeorge syndrome/velocardiofacial syndrome region, is responsible for the characteristic features of cat eye syndrome. This deletion disrupts the function of multiple genes, including those involved in heart development, facial morphology, and ear formation. The cat eye syndrome is often associated with microphthalmia, coloboma, and ptosis, as well as congenital heart defects and ear abnormalities.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, so we will skip it.
* **Option B:** This option is not relevant to cat eye syndrome, which is a specific chromosomal disorder.
* **Option C:** This option is not accurate, as cat eye syndrome is not primarily associated with Turner syndrome, which is a different chromosomal disorder.
* **Option D:** This option is not relevant to cat eye syndrome, which does not involve a specific genetic mutation leading to a particular disease.
**Clinical Pearl / High-Yield Fact**
Cat eye syndrome is often associated with microphthalmia, coloboma, and ptosis, as well as congenital heart defects and ear abnormalities. These features can be used to suspect the diagnosis of cat eye syndrome in a patient with a characteristic ocular or auricular anomaly.
**Correct Answer: C.**