Partial deletion of the long arm of chromosome 6 syndrome

Partial deletion of the long arm of chromosome 6 syndrome (also known as 6q deletion syndrome or distal 6q deletion syndrome) is a rare chromosomal disorder caused by the loss of genetic material from the long arm (q arm) of chromosome 6. The size and precise location of the deleted segment can vary considerably among affected individuals, which leads to a wide spectrum of clinical features and severity. Because multiple genes are lost in the deletion, the condition typically affects several body systems simultaneously. Common clinical features include intellectual disability of variable degree, developmental delay (particularly speech and motor milestones), distinctive facial features (such as a flat nasal bridge, hypertelorism, low-set ears, and micrognathia), and growth retardation. Structural abnormalities of the brain, heart, eyes, and genitourinary system have been reported in some patients. Hypotonia in infancy is frequently observed. Seizures and behavioral difficulties may also occur depending on the extent of the deletion. Some individuals with smaller or more distal deletions may have a milder phenotype. There is no cure for this chromosomal condition. Management is supportive and multidisciplinary, tailored to each patient's specific clinical manifestations. This may include early intervention programs, speech and occupational therapy, cardiac monitoring or surgical correction of congenital heart defects, ophthalmologic care, and antiepileptic medications when seizures are present. Genetic counseling is recommended for affected families to assess recurrence risk and guide family planning.

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