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Improved method for study of chromosomes of chorionic villus samples
M R Chowdhury1, R Mathur, K Prabhakara
1Department of Paediatrics, WHO Collaborating Centre in Genetics All India Institute of Medical Sciences, New Delhi.
The Indian Journal of Medical Research
|October 1, 1996
Summary
Chorionic villus sampling (CVS) provides fast prenatal diagnosis for chromosomal disorders. A direct culturing method using dispase proved as effective as long-term culture for analyzing chorionic villi at 10-12 weeks gestation.
Area of Science:
- Prenatal diagnostics
- Cytogenetics
- Reproductive medicine
Background:
- Chorionic villus sampling (CVS) is a key technique for early prenatal diagnosis of chromosomal abnormalities.
- Accurate and timely genetic information is crucial for pregnancy management.
- Evaluating different CVS analysis methods is essential for optimizing diagnostic efficiency.
Purpose of the Study:
- To compare four distinct methods for chromosomal analysis of chorionic villi.
- To identify a method yielding high-quality metaphases in adequate numbers for reliable diagnosis.
- To determine the optimal gestational window for CVS chromosomal analysis.
Main Methods:
- Evaluation of three direct preparation methods and one long-term culture method for CVS chromosomal analysis.
- Utilized synchronisation and dissociation with dispase in direct culturing.
- Assessed metaphase quality and quantity across different methods.
Main Results:
- The direct culturing method, employing synchronisation and dispase, demonstrated comparable efficacy to long-term culturing.
- Sufficient numbers of good-quality metaphases were obtained using the optimized direct method.
- The 10-12 week gestational period was identified as optimal for CVS analysis.
Conclusions:
- Direct culturing of chorionic villi using dispase offers a viable and efficient alternative to long-term culture for prenatal chromosomal analysis.
- This method ensures timely and accurate diagnosis of fetal chromosomal disorders.
- Optimizing the CVS collection period to 10-12 weeks enhances diagnostic success rates.