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6q subtelomeric deletion: is there a recognizable syndrome?
David A Stevenson1, Arthur R Brothman, John C Carey
1Department of Pediatrics, Divisions of Medical Genetic and Neurology, University of Utah, Salt Lake City, Utah, USA.
Clinical Dysmorphology
|April 2, 2004
Summary
This study identifies a rare deletion on chromosome 6q in a young girl, diagnosed using subtelomeric fluorescence in-situ hybridization (FISH). This genetic finding helps understand developmental delays and associated anomalies.
Area of Science:
- Genetics and Genomics
- Clinical Medicine
- Cytogenetics
Background:
- Subtelomeric regions are prone to rearrangements, often leading to developmental disorders.
- Fluorescence in-situ hybridization (FISH) is a key technique for detecting these cryptic imbalances.
- Understanding 6q deletions is crucial for diagnosing complex pediatric conditions.
Observation:
- A patient presented with developmental delay, seizures, and congenital anomalies.
- Subtelomeric FISH revealed a deletion in the long arm telomeric region of chromosome 6 (6q).
- Genomic microarray analysis confirmed the cryptic 6q subtelomeric deletion.
Findings:
- The patient exhibited a unique pattern of developmental delay, corpus callosum hypoplasia, dextrocardia, and minor physical anomalies.
- This case represents an isolated cryptic 6q subtelomeric deletion, distinct from previously reported cases with additional chromosomal abnormalities.
- The absence of retinal abnormalities suggests that genes causing such issues in other 6q deletions are located more proximally to 6q27.
Implications:
- Subtelomeric FISH is effective for diagnosing cryptic chromosomal deletions.
- Further case reports may help define the specific phenotype and natural history of isolated 6q subtelomeric deletions.
- Accurate diagnosis aids in genetic counseling for families affected by rare chromosomal disorders.