Partial deletion of the long arm of chromosome 5 syndrome

Partial deletion of the long arm of chromosome 5 syndrome (also referred to as 5q partial monosomy or 5q deletion syndrome in the constitutional context) encompasses a group of rare chromosomal disorders caused by the loss of a segment of genetic material from the long arm (q arm) of chromosome 5. Because the size and precise location of the deleted segment can vary considerably from patient to patient, the clinical presentation is highly variable. This condition is distinct from the acquired 5q- syndrome seen in myelodysplastic disorders; here the deletion is constitutional (present from birth) and affects multiple organ systems during development. Common clinical features may include intellectual disability of variable severity, developmental delay, growth retardation, distinctive craniofacial features (such as microcephaly, low-set ears, broad or flat nasal bridge, and micrognathia), and musculoskeletal anomalies. Congenital heart defects, feeding difficulties in infancy, and hypotonia have also been reported in some individuals. The specific combination and severity of symptoms depend on which genes are encompassed by the deleted region. Some patients may have relatively mild manifestations if the deletion is small, while larger deletions tend to produce more complex phenotypes involving multiple body systems including the central nervous system, cardiovascular system, and skeletal system. There is no cure for this chromosomal condition. Management is supportive and symptom-based, typically involving a multidisciplinary team of specialists. Early intervention programs including speech therapy, physical therapy, and occupational therapy are important for optimizing developmental outcomes. Cardiac anomalies, if present, may require surgical correction. Genetic counseling is recommended for affected families to assess recurrence risk, which depends on whether the deletion arose de novo or was inherited from a parent carrying a balanced chromosomal rearrangement.

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