Jacobsen syndrome

Jacobsen syndrome
Synonyms	11q deletion disorder
Pronounce	N/A
Specialty	Medical genetics
Symptoms	Developmental delay, intellectual disability, distinctive facial features, bleeding disorders
Complications	N/A
Onset	Congenital
Duration	Lifelong
Types	N/A
Causes	Genetic mutation
Risks	Family history
Diagnosis	Genetic testing
Differential diagnosis	N/A
Prevention	N/A
Treatment	Supportive care, symptomatic treatment
Medication	N/A
Prognosis	N/A
Frequency	Rare
Deaths	N/A

Jacobsen syndrome is a rare genetic disorder caused by the deletion of genetic material from the long arm of chromosome 11. It is also known as 11q deletion disorder.

Signs and Symptoms

Individuals with Jacobsen syndrome often present with a variety of clinical features, including:

• Developmental delay and intellectual disability
• Distinctive facial features such as a broad nasal bridge, downturned corners of the mouth, and a small lower jaw
• Bleeding disorders due to platelet dysfunction
• Congenital heart defects
• Skeletal abnormalities
• Growth retardation

Causes

Jacobsen syndrome is caused by a deletion of genetic material on the long arm (q) of chromosome 11. This deletion can vary in size and affects multiple genes, leading to the diverse symptoms observed in affected individuals. The condition is usually not inherited, occurring as a de novo mutation.

Diagnosis

Diagnosis of Jacobsen syndrome is typically confirmed through genetic testing, such as karyotyping or chromosomal microarray analysis, which can identify the specific deletion on chromosome 11.

Treatment

There is no cure for Jacobsen syndrome, and treatment is focused on managing symptoms and providing supportive care. This may include:

• Early intervention programs for developmental delays
• Special education services
• Speech therapy
• Physical therapy
• Occupational therapy
• Regular monitoring and management of bleeding disorders
• Surgical intervention for congenital heart defects

Prognosis

The prognosis for individuals with Jacobsen syndrome varies depending on the severity of symptoms and the presence of associated conditions. With appropriate medical care and support, many individuals can lead fulfilling lives.

Epidemiology

Jacobsen syndrome is a rare condition, with an estimated prevalence of 1 in 100,000 births. It affects both males and females equally.

See Also

• Chromosome 11
• Genetic disorders
• Developmental disabilities

External Links

• National Institutes of Health - Jacobsen Syndrome
• Genetics Home Reference - Jacobsen Syndrome