Genomic imprinting results in which of the following syndrome?
**Core Concept**
Genomic imprinting is an epigenetic phenomenon where the expression of a gene is determined by its parental origin, with one allele being silenced based on its parental origin. This is crucial in the development and function of various tissues and organs.
**Why the Correct Answer is Right**
The correct answer involves a condition caused by the loss of function of a gene due to genomic imprinting. In Prader-Willi syndrome (PWS), the paternal copy of the PWS region on chromosome 15 is deleted or silenced, leading to the absence of the PWS-associated protein, which is essential for growth and development. The loss of this protein results in the characteristic features of PWS, including hypotonia, feeding difficulties, and a failure to thrive in infancy, followed by excessive hunger and weight gain in later childhood.
**Why Each Wrong Option is Incorrect**
**Option A:** Angelman syndrome is a distinct condition caused by the loss of function of the UBE3A gene on chromosome 15, which is usually maternally imprinted. It presents with developmental delays, severe speech impairment, and a characteristic happy demeanor.
**Option B:** Beckwith-Wiedemann syndrome is a condition characterized by overgrowth and an increased risk of tumors, caused by abnormalities in the regulation of growth factors and cell proliferation, not genomic imprinting.
**Option C:** Turner syndrome is a condition affecting females, caused by the absence of one X chromosome, leading to short stature, infertility, and other physical features.
**Clinical Pearl / High-Yield Fact**
Genomic imprinting is a key concept in understanding the pathophysiology of several developmental disorders, and recognizing the distinct features of these conditions is crucial for accurate diagnosis and management.
**Correct Answer: C. Turner syndrome is not correct, however, the question was not fully provided.