Partial deletion of the long arm of chromosome 22 syndrome

Partial deletion of the long arm of chromosome 22 syndrome (Orphanet code 262182) refers to a group of rare chromosomal disorders caused by the loss of genetic material from the long arm (q arm) of chromosome 22. The specific clinical presentation depends on the size and location of the deleted segment. These deletions can affect multiple body systems, including the nervous system, cardiovascular system, musculoskeletal system, and craniofacial structures. Well-known subtypes of 22q deletions include 22q11.2 deletion syndrome (DiGeorge/velocardiofacial syndrome) and 22q13 deletion syndrome (Phelan-McDermid syndrome), but this Orphanet entry encompasses partial deletions of the long arm of chromosome 22 more broadly, including those that do not fall into a specifically named syndrome. Key clinical features can vary widely but may include intellectual disability, developmental delay, speech and language difficulties, behavioral abnormalities, congenital heart defects, dysmorphic facial features, hypotonia (low muscle tone), and growth abnormalities. Some individuals may have seizures, immune deficiencies, or endocrine abnormalities depending on the genes involved in the deleted region. The severity of symptoms ranges from mild to severe and is influenced by the extent of the chromosomal deletion. There is no cure for partial deletion of the long arm of chromosome 22. Treatment is supportive and symptom-based, typically involving a multidisciplinary team of specialists including cardiologists, neurologists, speech therapists, developmental pediatricians, and other healthcare providers. Early intervention programs, special education services, and therapies (physical, occupational, and speech) are important components of management. Genetic counseling is recommended for affected individuals and their families to understand recurrence risks and inheritance patterns.

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