Partial deletion of the long arm of chromosome 7 syndrome

Partial deletion of the long arm of chromosome 7 syndrome (also referred to as 7q partial monosomy or partial monosomy 7q) is a rare chromosomal disorder caused by the loss of a segment of genetic material from the long arm (q arm) of chromosome 7. The clinical presentation varies considerably depending on the size and precise location of the deleted segment. Because chromosome 7q contains numerous genes involved in growth, skeletal development, and neurological function, affected individuals may present with intellectual disability, developmental delay, growth retardation, and a range of craniofacial dysmorphisms including microcephaly, a broad nasal bridge, low-set ears, and micrognathia. Additional features may include skeletal anomalies, congenital heart defects, genitourinary malformations, and limb abnormalities. Some patients exhibit hypotonia and feeding difficulties in infancy. The severity and spectrum of symptoms are highly variable and correlate with the specific breakpoints and extent of the deletion. Notably, deletions involving the 7q11.23 region are associated with Williams syndrome, which is classified separately; the broader category of 7q deletions encompasses other segments of the long arm. There is no specific cure or targeted therapy for this condition. Management is supportive and multidisciplinary, addressing individual symptoms as they arise. This may include early intervention programs for developmental delay, speech and occupational therapy, cardiac monitoring and surgical correction of heart defects if present, orthopedic management for skeletal issues, and special education services. Genetic counseling is recommended for affected families to assess recurrence risk and to clarify the nature of the deletion through chromosomal microarray or other cytogenetic techniques.

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