16p13.11 microdeletion syndrome

16p13.11 microdeletion syndrome (Orphanet code 261236) is a rare chromosomal disorder caused by a submicroscopic deletion on the short arm of chromosome 16 at band p13.11. This region contains several genes, including NDE1, NTAN1, and MYH11, whose haploinsufficiency is thought to contribute to the clinical features. The syndrome is characterized by significant phenotypic variability, meaning that individuals carrying the same deletion can present with very different symptoms, and some carriers may even be clinically unaffected. The condition primarily affects the nervous system and neurodevelopment. Key clinical features include intellectual disability (ranging from mild to moderate), developmental delay, epilepsy and seizures, behavioral problems (including attention deficit hyperactivity disorder and autism spectrum features), and microcephaly. Some individuals may also present with congenital heart defects, skeletal anomalies, and dysmorphic facial features, though these are variable. Neuropsychiatric manifestations such as schizophrenia have also been reported in association with this deletion in some studies. There is currently no cure or targeted therapy for 16p13.11 microdeletion syndrome. Management is symptomatic and supportive, tailored to each individual's specific clinical presentation. This may include antiepileptic medications for seizure control, speech and occupational therapy for developmental delays, behavioral interventions, and cardiac monitoring or surgical correction if heart defects are present. Genetic counseling is recommended for affected families, as the deletion can be inherited from a mildly affected or apparently unaffected parent, complicating recurrence risk assessment. The incomplete penetrance and variable expressivity of this condition make clinical prediction challenging.

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