Partial deletion of the short arm of chromosome 6 syndrome

Partial deletion of the short arm of chromosome 6 syndrome (also known as 6p partial monosomy or distal 6p deletion syndrome) is a rare chromosomal disorder caused by the loss of genetic material from the short arm (p arm) of chromosome 6. The size and exact location of the deleted segment can vary among affected individuals, which leads to a wide spectrum of clinical features and severity. Because chromosome 6p harbors numerous genes important for development, deletions in this region can affect multiple body systems. Common clinical features include intellectual disability of variable degree, developmental delay, distinctive craniofacial features (such as a flat nasal bridge, hypertelorism, low-set ears, and micrognathia), eye abnormalities (including anterior chamber defects, Rieger anomaly, or other structural eye malformations), hearing impairment, congenital heart defects, and brain structural anomalies. Growth retardation and hypotonia are also frequently observed. Some patients may present with features overlapping with Rieger syndrome when the deletion involves the FOXC1 gene region at 6p25. There is no cure for this condition, and management is supportive and symptom-based. Treatment typically involves a multidisciplinary approach including early intervention programs, speech and physical therapy, ophthalmologic monitoring and surgical correction of eye defects if needed, cardiac evaluation and management, audiologic assessment, and special education services. Genetic counseling is recommended for affected families to assess recurrence risk, as most cases arise de novo, though parental chromosomal rearrangements such as balanced translocations can occasionally lead to recurrence.

Common questions about Partial deletion of the short arm of chromosome 6 syndrome