22q13 deletion syndrome

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(Redirected from Phelan-McDermid syndrome)

22q13 deletion syndrome
Chromosome 22
Synonyms Phelan-McDermid syndrome, 22q13.3 deletion syndrome
Pronounce
Specialty Medical genetics
Symptoms Developmental delay, intellectual disability, speech delay, hypotonia, autism spectrum disorder
Complications N/A
Onset Congenital
Duration Lifelong
Types N/A
Causes Genetic deletion on chromosome 22
Risks
Diagnosis Genetic testing, chromosomal microarray analysis
Differential diagnosis Autism spectrum disorder, intellectual disability, other chromosomal disorders
Prevention
Treatment Supportive care, speech therapy, occupational therapy, physical therapy
Medication
Prognosis Varies
Frequency Rare
Deaths


22q13 Deletion Syndrome, also known as Phelan-McDermid Syndrome, is a genetic disorder caused by the deletion of a segment on the long arm (q arm) of chromosome 22. This condition is characterized by a range of developmental, neurological, and physical symptoms.

Genetic Basis[edit | edit source]

The syndrome results from the deletion of genetic material on the distal end of chromosome 22, specifically at the 22q13 location. The size of the deletion can vary among individuals, leading to a spectrum of clinical manifestations. The SHANK3 gene, located in this region, is often implicated in the disorder, and its loss is associated with many of the neurological features observed in affected individuals.

Clinical Features[edit | edit source]

Individuals with 22q13 deletion syndrome may exhibit a variety of symptoms, including:

Physical features may include:

Diagnosis[edit | edit source]

Diagnosis of 22q13 deletion syndrome is typically confirmed through genetic testing, such as chromosomal microarray analysis or fluorescence in situ hybridization (FISH), which can detect the deletion on chromosome 22. Early diagnosis is crucial for managing symptoms and providing appropriate interventions.

Management[edit | edit source]

There is no cure for 22q13 deletion syndrome, but management focuses on addressing the individual symptoms and improving quality of life. This may include:

Related pages[edit | edit source]

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Contributors: Prab R. Tumpati, MD