Fetal cells in maternal blood

Area of Science:

• Reproductive biology
• Genetics
• Medical diagnostics

Background:

• Fetal cells circulating in maternal blood offer a pathway for noninvasive prenatal diagnosis.
• Previous research has focused on various fetal cell types, including trophoblasts, leukocytes, and nucleated red blood cells (NRBCs).
• NRBCs are considered particularly suitable for noninvasive prenatal diagnosis due to their characteristics.

Purpose of the Study:

• To review the detection of fetal cells in maternal blood across all trimesters of pregnancy.
• To evaluate the suitability of different fetal cell types for noninvasive prenatal diagnosis.
• To highlight the potential and challenges of using fetal NRBCs for diagnosing fetal anomalies.

Main Methods:

• Detection of fetal cells in maternal blood samples from all three trimesters.
• Application of various enrichment techniques for specific fetal cell types (trophoblasts, leukocytes, NRBCs).
• Utilizing fluorescence in-situ hybridization (FISH) for detecting fetal chromosomal abnormalities (trisomy).

Main Results:

• Fetal cells were successfully detected in maternal blood during all trimesters of normal pregnancies.
• Enrichment techniques for fetal trophoblast cells, leukocytes, and NRBCs have been developed.
• FISH successfully identified fetal trisomy in maternal blood following the enrichment of fetal NRBCs.

Conclusions:

• Fetal nucleated red blood cells are a promising target for noninvasive prenatal diagnosis.
• While encouraging results exist, accurate and reproducible diagnosis of fetal anomalies requires further optimization of enrichment and detection methods.
• Advancements in polymerase chain reaction (PCR) and FISH protocols are crucial for clinical application.