Partial duplication of the long arm of chromosome 7 syndrome

Partial duplication of the long arm of chromosome 7 syndrome (also known as partial trisomy 7q) is a rare chromosomal disorder in which a segment of the long arm (q arm) of chromosome 7 is duplicated, resulting in three copies of the genetic material in that region instead of the usual two. The clinical presentation varies depending on the size and specific location of the duplicated segment. Commonly reported features include intellectual disability, developmental delay, growth retardation, and a range of craniofacial dysmorphisms such as a broad or prominent forehead, low-set ears, micrognathia (small jaw), and a broad nasal bridge. Skeletal anomalies, limb abnormalities, and congenital heart defects have also been described in some patients. The severity of the condition is highly variable and correlates with the extent of the duplicated chromosomal material. Some individuals may present with relatively mild developmental delays, while others can have significant multi-system involvement including neurological impairment, feeding difficulties in infancy, and organ malformations. Hypotonia (low muscle tone) is frequently observed in the neonatal and infantile periods. There is no specific cure or targeted therapy for partial trisomy 7q. Management is supportive and symptomatic, tailored to the individual's clinical needs. This may include early intervention programs, speech and occupational therapy, surgical correction of congenital anomalies (such as cardiac defects), and ongoing developmental monitoring. Genetic counseling is recommended for affected families to assess recurrence risk, particularly when the duplication arises from a balanced chromosomal rearrangement in a parent.

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