Prader-Willi syndrome

Area of Science:

• Genetics
• Pediatrics
• Endocrinology

Background:

• Prader-Willi syndrome (PWS) is a complex genetic disorder with significant variability.
• Key manifestations include hypotonia, developmental delay, hyperphagia, obesity, and behavioral issues.
• PWS is characterized by the absence of paternally expressed genes in the 15q11.2-q13 chromosomal region, a phenomenon linked to genomic imprinting.

Purpose of the Study:

• To summarize the key clinical features and genetic mechanisms of Prader-Willi syndrome.
• To highlight the importance of understanding genomic imprinting in PWS pathogenesis.
• To provide an overview for diagnosis and management of PWS.

Main Methods:

• Review of clinical and genetic literature on Prader-Willi syndrome.
• Analysis of the genetic basis involving the 15q11.2-q13 region.
• Categorization of PWS based on etiological mechanisms.

Main Results:

• PWS presents with a spectrum of symptoms, including infantile hypotonia, developmental delay, and hyperphagia leading to obesity.
• Three primary genetic mechanisms cause PWS: paternal microdeletion, maternal uniparental disomy, and imprinting defects.
• These mechanisms all result in the lack of expression of critical paternally inherited genes.

Conclusions:

• Prader-Willi syndrome is a clinically heterogeneous disorder caused by the loss of paternal gene function in a specific chromosomal region.
• Accurate diagnosis relies on recognizing clinical signs and understanding the underlying genetic imprinting defects.
• Effective management requires a multidisciplinary approach addressing the diverse physical, developmental, and behavioral challenges.