Partial duplication of the long arm of chromosome 5 syndrome

Partial duplication of the long arm of chromosome 5 syndrome (also known as partial trisomy 5q) is a rare chromosomal disorder in which a segment of the long arm (q arm) of chromosome 5 is duplicated, resulting in three copies of the genetic material in that region instead of the usual two. The clinical presentation varies considerably depending on the size and specific location of the duplicated segment. Common features may include intellectual disability, developmental delay, growth retardation, craniofacial dysmorphisms (such as a broad or flat nasal bridge, micrognathia, low-set ears, and hypertelorism), and various congenital anomalies. Musculoskeletal abnormalities, cardiac defects, and limb anomalies have also been reported in some cases. Because the phenotype is highly variable and depends on the specific breakpoints of the duplication, no single clinical presentation defines this syndrome. Some individuals may be mildly affected while others have more significant multi-system involvement. Diagnosis is typically made through chromosomal analysis, including karyotyping, FISH (fluorescence in situ hybridization), or chromosomal microarray analysis, which can precisely define the duplicated region. There is no specific cure or targeted therapy for this condition. Management is supportive and symptomatic, involving a multidisciplinary team that may include developmental pediatricians, cardiologists, orthopedic specialists, speech and occupational therapists, and genetic counselors. Early intervention programs for developmental delays and individualized educational support are important components of care.

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