Prader-Willi Syndrome and Schaaf-Yang Syndrome: Neurodevelopmental Diseases Intersecting at the MAGEL2 Gene
Michael D Fountain1,2, Christian P Schaaf3,4
1Interdepartmental Program in Translational Biology and Molecular Medicine, Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA. mfountai@bcm.edu.
Insights
Prader-Willi syndrome (PWS) and Schaaf-Yang syndrome share genetic causes and overlapping symptoms. Research highlights distinct features and genetic insights into these neurodevelopmental disorders.
Area of Science:
- Genetics
- Neurodevelopmental Disorders
- Molecular Biology
Background:
- Prader-Willi syndrome (PWS) is a complex neurodevelopmental disorder.
- PWS involves hypotonia, developmental delay, feeding issues, and behavioral phenotypes, including autism spectrum disorder (ASD).
- PWS is caused by the absence of specific genes on chromosome 15q11-q13.
Purpose of the Study:
- To explore the clinical and molecular overlap between PWS and Schaaf-Yang syndrome (SYS).
- To identify distinguishing features between PWS and SYS.
- To gain insight into the pathogenetic mechanisms underlying both disorders.
Main Methods:
- Comparative analysis of clinical phenotypes.
- Molecular genetic analysis of PWS and SYS.
Main Results:
- SYS, caused by MAGEL2 mutations, shares features with PWS but includes joint contractures and a higher prevalence of ASD (up to 75%).
- MAGEL2 is a key gene within the PWS critical region.
- Distinct clinical presentations aid in differentiating PWS and SYS.
Conclusions:
- The overlap and distinctions between PWS and SYS provide valuable insights into their underlying pathogenetic mechanisms.
- Understanding these related disorders advances knowledge of neurodevelopmental gene function.
- Further research can refine diagnostic criteria and therapeutic strategies for PWS and SYS.
Abstract:
Prader-Willi syndrome (PWS) is a neurodevelopmental disorder characterized by neonatal hypotonia, developmental delay/intellectual disability, and characteristic feeding behaviors with failure to thrive during infancy; followed by hyperphagia and excessive weight gain later in childhood. Individuals with PWS also manifest complex behavioral phenotypes. Approximately 25% meet criteria for autism spectrum disorder (ASD). PWS is caused by the absence of paternally expressed, maternally silenced genes at chromosome 15q11-q13. MAGEL2 is one of five protein-coding genes in the PWS-critical domain. Truncating point mutations of the paternal allele of MAGEL2 cause Schaaf-Yang syndrome, which has significant phenotypic overlap with PWS, but is also clinically distinct; based on the presence of joint contractures, and a particularly high prevalence of autism spectrum disorder (up to 75% of affected individuals). The clinical and molecular overlap between PWS and Schaaf-Yang syndrome, but also their distinguishing features provide insight into the pathogenetic mechanisms underlying both disorders.
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