Distal 7q11.23 microdeletion syndrome

Distal 7q11.23 microdeletion syndrome (also known as 7q11.23 distal deletion syndrome or Williams-Beuren region duplication syndrome distal deletion) is a rare chromosomal disorder caused by a microdeletion in the distal portion of the 7q11.23 region, adjacent to but distinct from the classic Williams-Beuren syndrome critical region. This deletion typically spans approximately 1.2 Mb and involves several genes including HIP1, YWHAG, and others in the distal flanking region. The syndrome primarily affects neurodevelopment, with key features including speech and language delay, intellectual disability of variable severity, and behavioral difficulties such as attention deficit and autistic features. Affected individuals may also present with seizures or epilepsy, mild facial dysmorphism (which can include a broad forehead, short philtrum, and thin upper lip), and variable congenital anomalies. Some patients exhibit mild cardiovascular abnormalities, though these are less prominent than in Williams syndrome. Growth parameters may be affected, with some individuals showing short stature or microcephaly. There is no specific cure for distal 7q11.23 microdeletion syndrome. Management is supportive and symptom-based, typically involving speech and language therapy, occupational therapy, special educational support, and behavioral interventions. Seizures, when present, are managed with standard antiepileptic medications. Regular developmental assessments and multidisciplinary follow-up are recommended to address the variable clinical manifestations. Genetic counseling is important for affected families, particularly regarding recurrence risk.

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