In which of the following conditions, Aniridia and Hemihyperophy are most likely present?
**Core Concept**
Aniridia is a rare congenital disorder characterized by the underdevelopment or absence of the iris, while hemihyperophy refers to the excessive growth of one side of the body. These conditions are often associated with genetic mutations affecting embryonic development.
**Why the Correct Answer is Right**
The correct answer is linked to WAGR syndrome, a rare genetic disorder caused by a deletion on the short arm of chromosome 11 (11p13). This deletion affects the WT1 gene, which is crucial for the development of the eyes, kidneys, and other organs. In WAGR syndrome, aniridia and hemihyperophy are common manifestations due to the disruption of normal embryonic development. The WT1 gene plays a vital role in regulating cell growth and differentiation, and its mutation can lead to the characteristic features of WAGR syndrome.
**Why Each Wrong Option is Incorrect**
**Option A:** Turner syndrome is a genetic disorder affecting females, characterized by the absence of one X chromosome. While Turner syndrome can lead to various physical abnormalities, it is not typically associated with aniridia or hemihyperophy.
**Option B:** Prader-Willi syndrome is a genetic disorder caused by the deletion of a region on chromosome 15. It is characterized by short stature, obesity, and intellectual disability, but not typically aniridia or hemihyperophy.
**Option C:** Beckwith-Wiedemann syndrome is a genetic disorder characterized by excessive growth during fetal development, leading to hemihyperophy. However, it is not typically associated with aniridia.
**Clinical Pearl / High-Yield Fact**
WAGR syndrome is a classic example of a genetic disorder caused by a chromosomal deletion, highlighting the importance of chromosomal analysis in diagnosing rare genetic conditions.
**Correct Answer:** C. Beckwith-Wiedemann syndrome