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Prader-Willi syndrome.

Suzanne B Cassidy1, Daniel J Driscoll

  • 1Division of Medical Genetics, Department of Pediatrics, University of California, San Francisco, CA 94143-0706, USA. suzannecassidy@comcast.net

European Journal of Human Genetics : EJHG
|September 11, 2008
PubMed
Summary
This summary is machine-generated.

Prader-Willi syndrome (PWS) is a genetic imprinting disorder affecting multiple body systems. It results from the absence of paternally inherited genes in the 15q11.2-q13 region, leading to varied symptoms from infancy through adulthood.

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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.