Distal deletion 15q syndrome

Distal deletion 15q syndrome (also known as terminal deletion 15q or monosomy 15qter) is a rare chromosomal disorder caused by a deletion of genetic material from the distal (far end) portion of the long arm of chromosome 15. The size and exact location of the deletion can vary among affected individuals, which contributes to a wide spectrum of clinical severity. This condition is typically identified through cytogenetic analysis or chromosomal microarray and is classified under partial monosomies of chromosome 15. The syndrome affects multiple body systems. Key clinical features include intellectual disability of variable severity, growth retardation, craniofacial dysmorphism (which may include microcephaly, a high forehead, broad nasal bridge, and ear anomalies), hypotonia (low muscle tone), and skeletal abnormalities. Cardiac malformations, feeding difficulties in infancy, and seizures have also been reported in some patients. Behavioral issues and speech and language delays are common developmental concerns. There is no specific cure for distal deletion 15q syndrome. Management is supportive and symptomatic, tailored to the individual's clinical presentation. This may include early intervention programs, speech and occupational therapy, physical therapy for motor delays, cardiac monitoring and surgical correction of heart defects if present, and antiepileptic medications for seizure management. Regular developmental assessments and multidisciplinary follow-up are recommended to optimize outcomes. Genetic counseling is advised for affected families to discuss recurrence risk and family planning.

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