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Proximal 6q interstitial deletion without severe mental retardation
1Division of Neurodevelopmental Pediatrics, Department of Pediatrics, Geisinger Medical Center, Danville, PA 17822-1339, USA. smyers1@geisinger.edu
Genetic Counseling (Geneva, Switzerland)
|November 2, 2005
Summary
This study details a rare proximal 6q interstitial deletion in a child with mild cognitive delays, contrasting with severe intellectual disability typically seen. This finding offers crucial insights for genetic counseling regarding 6q deletions.
Area of Science:
- Genetics
- Developmental Biology
- Clinical Medicine
Background:
- Proximal 6q interstitial deletions are rare genetic events.
- Previously reported cases exhibit severe to profound mental retardation.
- The 6q14 region is associated with autosomal dominant drusen and macular degeneration.
Observation:
- A young girl presented with a proximal 6q interstitial deletion [46, XX, del (6) (q1 3q15)].
- She displayed typical morphological and neurological features but with only mild cognitive and language delays.
- Severe gross motor delay was noted at 34 months, with average receptive language skills.
Findings:
- This is the first reported case of a proximal 6q interstitial deletion without severe cognitive deficiency.
- The patient shows a milder clinical presentation than previously documented.
- Absence of ocular abnormalities like drusen was confirmed.
Implications:
- This case expands the understanding of the phenotypic variability associated with proximal 6q deletions.
- Findings are vital for genetic counseling of families with infants diagnosed with 6q deletions.
- The patient remains at risk for visual impairment due to the deleted region's association with macular degeneration.