Young–Simpson syndrome

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
Founder, WikiMD Wellnesspedia &
W8MD medical weight loss NYC and sleep center NYC

Young–Simpson syndrome
Synonyms	YSS
Pronounce
Specialty	Medical genetics
Symptoms	Congenital hypothyroidism, developmental delay, distinctive facial features, heart defects, hearing loss
Complications	N/A
Onset	Infancy
Duration	Lifelong
Types	N/A
Causes	Genetic mutation
Risks
Diagnosis	Genetic testing, clinical evaluation
Differential diagnosis	Kabuki syndrome, CHARGE syndrome
Prevention	N/A
Treatment	Supportive care, hormone replacement therapy
Medication	Thyroid hormone replacement
Prognosis	Variable, depends on severity of symptoms
Frequency	Rare
Deaths

Young–Simpson syndrome is a rare genetic disorder characterized by a combination of distinctive facial features, developmental delay, and other systemic abnormalities. It is inherited in an autosomal dominant pattern, meaning a single copy of the altered gene in each cell is sufficient to cause the disorder.

Clinical Features

Individuals with Young–Simpson syndrome typically present with a range of clinical features, which may include:

• Facial Dysmorphism: Characteristic facial features such as a broad forehead, upslanting palpebral fissures, a depressed nasal bridge, and a wide mouth.
• Developmental Delay: Affected individuals often experience significant delays in reaching developmental milestones, including motor skills and speech.
• Hypothyroidism: Many patients have underactive thyroid glands, leading to symptoms such as fatigue, weight gain, and cold intolerance.
• Congenital Heart Defects: Some individuals may have structural abnormalities of the heart, which can vary in severity.
• Other Features: Additional features may include hearing loss, vision problems, and skeletal abnormalities.

Genetics

Young–Simpson syndrome is caused by mutations in specific genes that are involved in developmental processes. The exact genetic cause can vary among affected individuals, but the inheritance pattern is typically autosomal dominant. This means that an affected individual has a 50% chance of passing the mutated gene to their offspring.

Diagnosis

Diagnosis of Young–Simpson syndrome is based on clinical evaluation and the identification of characteristic features. Genetic testing can confirm the diagnosis by identifying mutations in the associated genes. Early diagnosis is important for managing the symptoms and providing appropriate interventions.

Management

There is no cure for Young–Simpson syndrome, and treatment is focused on managing the symptoms and improving quality of life. This may include:

• Endocrine Management: Treatment of hypothyroidism with thyroid hormone replacement therapy.
• Developmental Support: Early intervention programs, including physical, occupational, and speech therapy, to support developmental progress.
• Cardiac Care: Monitoring and management of any congenital heart defects by a cardiologist.
• Regular Monitoring: Routine check-ups to monitor growth, development, and the emergence of any new symptoms.

See also

• Genetic disorder
• Developmental delay
• Congenital heart defect
• Hypothyroidism