Partial duplication of the short arm of chromosome 17 syndrome

Partial duplication of the short arm of chromosome 17 syndrome (also referred to as partial trisomy 17p) is a rare chromosomal anomaly in which a portion of the short arm (p arm) of chromosome 17 is duplicated, resulting in three copies of the genetic material in that region instead of the usual two. This extra chromosomal material disrupts normal development and can affect multiple body systems. The condition is typically identified prenatally or in early infancy based on the presence of congenital anomalies and developmental concerns. Clinical features are variable depending on the size and exact location of the duplicated segment, but commonly reported findings include intellectual disability, developmental delay, growth retardation, and distinctive craniofacial features such as a broad or prominent forehead, hypertelorism (widely spaced eyes), a flat nasal bridge, low-set ears, and micrognathia (small jaw). Skeletal anomalies, congenital heart defects, and hypotonia (low muscle tone) have also been described in affected individuals. Some patients may present with seizures or structural brain abnormalities. There is no specific cure or targeted therapy for this chromosomal duplication syndrome. Management is supportive and symptomatic, involving a multidisciplinary team that may include developmental pediatricians, cardiologists, neurologists, orthopedic specialists, and speech and physical therapists. Early intervention programs focusing on developmental support can help optimize outcomes. Genetic counseling is recommended for affected families to assess recurrence risk, particularly if a parent carries a balanced chromosomal rearrangement such as a translocation or inversion that predisposes to the duplication.

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