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Recombinant X chromosome in a prenatal diagnosis
C Orellana1, L Badía, F Martínez
1Unidad de Genética y Diagnóstico Prenatal, Hospital Universitario La Fe, Valencia, Spain. orellana_car@gva.es
Cytogenetic and Genome Research
|February 18, 2006
Summary
A prenatal study identified a rare recombinant X chromosome (rec(X)) with extra Xq material and a deleted Xp segment. This de novo genetic alteration resulted in a healthy baby girl, demonstrating successful pregnancy continuation.
Area of Science:
- Prenatal diagnostics
- Human genetics
- Cytogenetics
Background:
- Prenatal diagnosis of chromosomal abnormalities is crucial for genetic counseling.
- Amniotic fluid analysis allows for detailed fetal karyotyping.
- Identifying complex chromosomal rearrangements requires advanced molecular techniques.
Observation:
- A 39-year-old female underwent prenatal cytogenetic analysis of amniotic fluid.
- An unusual X chromosome variant with extra material on the short arm was detected.
- G-banding suggested the extra material originated from the X chromosome's long arm.
Findings:
- Complementary studies, including parental karyotypes, microsatellite typing, and comparative genomic hybridization (CGH), were performed.
- The derivative chromosome was confirmed as a de novo recombinant X chromosome.
- The genetic alteration involved duplication of the Xq region and partial deletion of the Xp region.
Implications:
- The identification of a de novo recombinant X chromosome (rec(X)) with duplication of Xq and deletion of Xp is a rare finding.
- Despite the complex chromosomal rearrangement, the parents opted to continue the pregnancy.
- The successful birth of a healthy female infant highlights the importance of accurate prenatal diagnosis and genetic counseling for complex chromosomal abnormalities.