Non-distal deletion 10q syndrome

Non-distal deletion 10q syndrome (also known as interstitial deletion 10q or proximal/medial deletion of the long arm of chromosome 10) is a rare chromosomal disorder caused by a partial deletion within the long arm (q arm) of chromosome 10, excluding the terminal (distal) region. Unlike distal 10q deletions, these interstitial deletions involve segments closer to the centromere or within the middle portion of 10q. The clinical presentation varies depending on the size and exact location of the deleted segment, but commonly includes intellectual disability, developmental delay, growth retardation, and a range of craniofacial dysmorphic features such as microcephaly, a broad or flat nasal bridge, low-set ears, and micrognathia. Affected individuals may also present with congenital heart defects, skeletal anomalies, urogenital malformations, and ocular abnormalities. Hypotonia is frequently observed in infancy. Some patients exhibit behavioral difficulties and speech delay. The severity of the phenotype is highly variable and correlates with the specific chromosomal breakpoints and the genes encompassed by the deletion. Most cases arise de novo, though rarely a deletion may be inherited from a parent carrying a balanced chromosomal rearrangement. Diagnosis is confirmed through karyotyping, FISH, or chromosomal microarray analysis. There is no specific curative treatment; management is supportive and multidisciplinary, addressing individual symptoms such as cardiac defects (which may require surgical intervention), developmental therapies including speech and occupational therapy, and regular monitoring of growth and neurodevelopment. Genetic counseling is recommended for affected families.

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