Prader-Willi Syndrome: A spectrum of anatomical and clinical features

Area of Science:

• Genetics
• Developmental Biology
• Clinical Anatomy

Background:

• Prader-Willi Syndrome (PWS) is a genetic disorder affecting approximately 400,000 individuals globally, stemming from a mutation on Chromosome 15.
• PWS manifests with a spectrum of clinical features including hypotonia, feeding difficulties in infancy, and characteristic craniofacial differences.
• Hyperphagia leading to excessive weight gain is a hallmark of PWS, presenting significant health risks if unmanaged throughout life.

Purpose of the Study:

• To detail the clinical and anatomical manifestations of Prader-Willi Syndrome.
• To identify discrepancies and limitations in the current literature regarding PWS.
• To enhance understanding of the syndrome's varied presentation across developmental stages.

Main Methods:

• Review of existing clinical and anatomical literature on Prader-Willi Syndrome.
• Analysis of phenotypic characteristics and their developmental progression.
• Comparison of clinical manifestations with genetic subtypes.

Main Results:

• Infancy: hypotonia, feeding issues, hypogonadism, dolichocephaly, and specific facial features (narrow bifrontal diameter, almond-shaped eyes, small mouth).
• Early childhood: more pronounced craniofacial features, global developmental delay, and onset of hyperphagia.
• Untreated hyperphagia leads to significant weight gain and associated health complications throughout life.

Conclusions:

• Genetic screening is the primary diagnostic tool for PWS.
• Awareness of characteristic clinical and anatomical features, including genetic subtype variations, is crucial for diagnosis.
• The variability and asynchronous onset of PWS manifestations complicate early clinical assessment.