16p11.2p12.2 microdeletion syndrome

16p11.2p12.2 microdeletion syndrome (Orphanet: 261211) is a rare chromosomal disorder caused by a contiguous deletion spanning the 16p11.2 to 16p12.2 region. This deletion is larger than the more commonly described proximal 16p11.2 microdeletion and encompasses additional genes, which may contribute to a more complex and often more severe clinical presentation. The condition arises either de novo or may be inherited from a parent who carries the deletion, sometimes with variable expressivity. The syndrome primarily affects the nervous system, musculoskeletal system, and craniofacial structures. Key clinical features include intellectual disability ranging from mild to severe, developmental delay (particularly speech and language delay), autism spectrum disorder or autistic features, behavioral difficulties, seizures, and hypotonia. Craniofacial dysmorphisms may include microcephaly, a flat midface, short nose, and ear anomalies. Some individuals may also present with feeding difficulties in infancy, short stature, and congenital anomalies affecting the heart or other organ systems. The phenotype is highly variable, even among affected members of the same family. There is currently no cure or targeted therapy for 16p11.2p12.2 microdeletion syndrome. Management is supportive and multidisciplinary, focusing on early intervention services including speech therapy, occupational therapy, physical therapy, and behavioral support. Seizures are managed with standard antiepileptic medications. Cardiac or other structural anomalies may require surgical intervention. Regular developmental and neurological monitoring is recommended throughout childhood and into adulthood.

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