Partial duplication of the short arm of chromosome 11 syndrome

Partial duplication of the short arm of chromosome 11 syndrome (also known as partial trisomy 11p) is a rare chromosomal disorder in which a portion of the short arm (p arm) of chromosome 11 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 at birth or during early childhood based on characteristic clinical features. Clinical features are variable depending on the size and exact location of the duplicated segment but commonly include intellectual disability, developmental delay, craniofacial dysmorphism (such as a broad or flat nasal bridge, hypertelorism, micrognathia, and low-set ears), growth retardation, and hypotonia. Some patients may also present with congenital heart defects, skeletal anomalies, and urogenital malformations. Duplications involving the 11p15 region may be associated with Beckwith-Wiedemann spectrum features, including macrosomia, macroglossia, and organomegaly, due to the presence of imprinted genes in that region. There is no specific cure for this condition. Management is supportive and multidisciplinary, focusing on the individual's specific symptoms. This may include early intervention programs, speech and physical therapy, cardiac monitoring and surgical correction of heart defects if present, and regular developmental assessments. Genetic counseling is recommended for affected families to understand recurrence risks, particularly when the duplication arises from a balanced chromosomal rearrangement in a parent.

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