3q13 microdeletion syndrome

3q13 microdeletion syndrome (also known as 3q13.31 microdeletion syndrome or interstitial deletion 3q13) is a rare chromosomal disorder caused by a small deletion on the long arm of chromosome 3 in the region 3q13. This contiguous gene deletion syndrome affects multiple body systems and is characterized by a recognizable pattern of clinical features including intellectual disability, developmental delay (particularly speech and language delay), behavioral abnormalities, and distinctive facial features. Facial dysmorphisms may include a round face, short philtrum, thin upper lip, and broad nasal bridge. Many affected individuals also present with short stature, obesity or tendency toward excess weight gain, and hypotonia (low muscle tone) in infancy. Additional features that have been reported in some patients include skeletal anomalies, genitourinary malformations, and variable congenital anomalies. The degree of intellectual disability ranges from mild to moderate in most cases. Behavioral features may include attention deficit, autistic traits, and anxiety. The deletion typically encompasses several genes, and the haploinsufficiency of specific genes within the deleted region, including GAP43 and possibly others, is thought to contribute to the neurodevelopmental phenotype. There is no cure for 3q13 microdeletion syndrome, and management is supportive and symptom-based. Treatment typically involves early intervention programs, speech and language therapy, occupational therapy, physical therapy for motor delays, and special educational support. Behavioral interventions and, when appropriate, pharmacological management of behavioral symptoms may be considered. Regular monitoring of growth, development, and potential associated anomalies is recommended. Genetic counseling is advised for affected families to discuss recurrence risk and family planning.

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