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Prader-Willi syndrome
1Department of Genetics, Case Western Reserve University, Cleveland, OH, USA.
Insights
Prader-Willi syndrome is a complex genetic disorder causing hypotonia, developmental delay, and obesity. Genetic testing aids early detection and management of this condition, which stems from chromosome 15 abnormalities.
Area of Science:
- Genetics
- Endocrinology
- Developmental Pediatrics
Background:
- Prader-Willi syndrome (PWS) is a complex multisystem disorder.
- Key features include infantile hypotonia, developmental delay, behavioral issues, obesity, hypogonadism, and short stature.
- Obesity and behavioral problems are primary drivers of morbidity and mortality.
Purpose of the Study:
- To summarize the genetic basis and clinical manifestations of Prader-Willi syndrome.
- To highlight the importance of genetic testing for early diagnosis and management.
- To explore phenotypic variations linked to genetic causes and race.
Main Methods:
- Review of genetic abnormalities in the imprinted region of proximal 15q.
- Analysis of clinical findings associated with PWS.
- Correlation of genetic causes (deletion, uniparental disomy, imprinting defects) with phenotypic presentation.
Main Results:
- PWS results from the absence of paternally active genes on chromosome 15q.
- Common causes include paternal interstitial deletion, maternal uniparental disomy, or imprinting defects.
- Genetic testing enables early diagnosis and has revealed phenotypic differences based on genetic cause and race.
Conclusions:
- Prader-Willi syndrome is a genetically determined disorder with significant clinical impact.
- Advances in genetic diagnostics allow for timely intervention and tailored management.
- Understanding the genetic etiology is crucial for recognizing phenotypic variability in PWS patients.
Abstract:
Prader-Willi syndrome is a complex disorder affecting multiple systems with many manifestations relating to hypothalamic insufficiency. Major findings include infantile hypotonia, developmental delay and mental retardation, behaviour disorder, characteristic facial appearance, obesity, hypogonadism, and short stature. Obesity and the behavioural problems are the major causes of morbidity and mortality. Prader-Willi syndrome is caused by abnormalities of the imprinted region of proximal 15q and results from absence of the normally active paternal genes in this region. Such absence results from paternal interstitial deletion, maternal uniparental disomy, or a mutation or other abnormality in the imprinting process. Diagnostic identification of all causes has become available in recent years, permitting early detection and institution of appropriate management. This testing has permitted recent identification of some phenotypic differences among affected subjects of different race and between those with deletions and uniparental disomy as a cause.