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Prenatal detection of complex chromosomal aberrations using advanced molecular cytogenetic techniques
J M de Pater1, L C P Govaerts, S A de Man
1Department of Biomedical Genetics, University Medical Centre, Utrecht, The Netherlands. J.M.dePater@dmg.azu.nl
Prenatal Diagnosis
|September 17, 2003
Summary
This study identified a marker chromosome in a fetus with a complex chromosomal abnormality involving chromosomes 5 and 8. The findings clarify the genetic basis of trisomy 5p syndrome and highlight the importance of advanced molecular cytogenetics.
Area of Science:
- Cytogenetics
- Human Genetics
- Prenatal Diagnosis
Background:
- Prenatal diagnosis of fetal chromosomal abnormalities is crucial for genetic counseling.
- Complex karyotypes involving marker chromosomes require precise characterization.
Observation:
- A fetus presented with ultrasound abnormalities, leading to genetic analysis.
- Karyotyping revealed a mosaic karyotype with a derivative chromosome 5 and a supernumerary marker chromosome.
Findings:
- Fluorescence in situ hybridization (FISH) and microFISH identified the marker chromosome as originating from chromosome 8.
- The aberrant chromosome 5 was characterized as der(5)t(5;8)(p10;p23.3).
- The fetus exhibited complete trisomy 5p, distal 8p trisomy, and centromeric 8p trisomy.
Implications:
- Accurate characterization of de novo marker chromosomes is essential for prenatal counseling.
- Advanced molecular cytogenetic techniques like FISH are indispensable for precise breakpoint determination.
- This case deepens the understanding of trisomy 5p syndrome and related chromosomal disorders.