A simple technique for obtaining high quality chromosome preparations from chorionic villus samples using FdU...

Area of Science:

• Cytogenetics
• Prenatal Diagnosis
• Molecular Biology

Background:

• First-trimester fetal diagnosis relies on accurate chromosome analysis.
• Chorionic villus sampling (CVS) is a common prenatal diagnostic procedure.
• Direct chromosome analysis from CVS can be challenging due to low mitotic index and poor chromosome morphology.

Purpose of the Study:

• To optimize a fluorodeoxyuridine (FdU) synchronization technique for direct chromosome analysis from CVS.
• To improve chromosome morphology and mitotic index for diagnostic accuracy.
• To reduce the turnaround time for cytogenetic diagnosis from CVS.

Main Methods:

• A fluorodeoxyuridine (FdU) synchronization technique was applied to 30 chorionic villus samples (CVS).
• Villi were incubated with FdU, released with thymidine, and arrested in metaphase with colcemid.
• G-banded karyotypes were prepared from at least 15 metaphases per case.

Main Results:

• The FdU synchronization technique resulted in improved chromosome morphology and a high mitotic index.
• Diagnostic chromosome analysis was successful in all 30 clinical cases.
• The entire diagnostic procedure was completed within 48 hours of CVS collection.
• This method significantly enhanced the success rate of direct chromosome analyses from CVS.

Conclusions:

• The FdU synchronization technique is effective for rapid and accurate prenatal cytogenetic diagnosis from CVS.
• This method improves the quality of chromosome preparations and increases the yield of analyzable metaphases.
• The optimized protocol is suitable for busy cytogenetic laboratories requiring timely results.