17q23.1q23.2 microdeletion syndrome

17q23.1q23.2 microdeletion syndrome is a rare chromosomal disorder caused by a small deletion (microdeletion) on the long arm of chromosome 17, specifically in the q23.1 to q23.2 region. This contiguous gene deletion syndrome affects multiple body systems and is characterized by a recognizable pattern of clinical features. The condition is typically identified through chromosomal microarray analysis, as the deletion is too small to be detected by conventional karyotyping. Key clinical features include intellectual disability of variable severity, growth retardation with short stature, microcephaly (small head size), and distinctive facial features such as a long face, thin upper lip, and prominent nose. Many affected individuals also present with limb anomalies, particularly hand and foot malformations, as well as cardiac defects. Joint hypermobility and feeding difficulties in infancy have also been reported. The TBX4 gene, located within the deleted region, is thought to contribute to some of the skeletal and cardiac features observed in this syndrome. There is currently no cure for 17q23.1q23.2 microdeletion syndrome, and management is supportive and symptom-based. Treatment typically involves a multidisciplinary approach including developmental and educational support for intellectual disability, orthopedic management for skeletal anomalies, cardiac monitoring and intervention if congenital heart defects are present, and speech and physical therapy as needed. Early intervention programs are recommended to optimize developmental outcomes. Genetic counseling is advised for affected families.

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