Partial duplication of the long arm of chromosome 22 syndrome

Partial duplication of the long arm of chromosome 22 syndrome (also known as partial trisomy 22q) is a rare chromosomal disorder in which a segment of the long arm (q arm) of chromosome 22 is duplicated, resulting in three copies of the genetic material in that region instead of the usual two. The clinical presentation is highly variable depending on the size and specific location of the duplicated segment. Common features may include intellectual disability, developmental delay, growth retardation, and a range of dysmorphic facial features such as a broad or flat nasal bridge, low-set ears, micrognathia, and hypertelorism. Congenital heart defects, hypotonia, and skeletal anomalies have also been reported in some affected individuals. The severity of the condition varies considerably. Some individuals with smaller duplications may have mild developmental concerns, while those with larger duplicated segments tend to have more significant medical and developmental challenges. Additional features that have been described in some cases include urogenital anomalies, feeding difficulties in infancy, and seizures. Because the phenotype depends on which genes are present in extra copies, no two patients may present identically. There is no cure for this chromosomal condition. Management is supportive and symptomatic, tailored to the individual's specific medical needs. This may include early intervention programs, speech and occupational therapy, cardiac evaluation and surgical correction of heart defects if present, and monitoring for seizures. A multidisciplinary team approach involving geneticists, cardiologists, neurologists, and developmental specialists is typically recommended to optimize outcomes.

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