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Array CGH detection of a cryptic deletion in a complex chromosome rearrangement
Carla Rosenberg1, Jeroen Knijnenburg, Maria de Lourdes Chauffaille
1Laboratory of Cytochemistry and Cytometry, Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands. Carlarosenberg45@aol.com
Human Genetics
|February 24, 2005
Summary
Balanced complex chromosome rearrangements (CCR) are rare human conditions. Genomic array analysis revealed a cryptic deletion in a patient with a CCR, highlighting its value in detecting subtle genomic imbalances.
Area of Science:
- Human Genetics
- Genomic Instability
- Cytogenetics
Background:
- Balanced complex chromosome rearrangements (CCR) are rare chromosomal abnormalities in humans.
- CCR are typically identified through abnormal phenotypes or reproductive issues in carriers.
- Potential genomic imbalances at rearrangement breakpoints remain poorly understood.
Observation:
- A patient presented with behavioral issues as the only symptom.
- The patient had a CCR involving chromosomes 2, 10, and 11 with eight breakpoints.
- Standard cytogenetic methods (G-banding, FISH) indicated the rearrangement was balanced.
Findings:
- Genomic array analysis detected a cryptic deletion of 0.15-1.5 Mb at one breakpoint.
- The formation of this CCR likely involved sequential breaks within a single cell division.
- Array comparative genomic hybridization (CGH) proved effective in identifying cryptic imbalances.
Implications:
- Array CGH complements traditional cytogenetic techniques for characterizing complex rearrangements.
- Detecting submicroscopic deletions associated with CCRs is crucial for accurate diagnosis.
- Understanding cryptic imbalances can improve genetic counseling for individuals with CCRs.