Identification of circulating fetal cell markers by microarray analysis

Area of Science:

• Obstetrics and Gynecology
• Cell Biology
• Genetics

Background:

• Fetal cells are present in maternal circulation, but are rare and difficult to isolate.
• Understanding fetal cell types and proportions in maternal blood is crucial for non-invasive prenatal testing.

Purpose of the Study:

• To identify specific markers for fetal cells in maternal blood at the end of the first trimester.
• To enable more efficient enrichment of fetal cells from maternal blood samples.

Main Methods:

• Isolation of 23 fetal cells from maternal blood using red blood cell lysis and magnetic-activated cell sorting.
• Identification of fetal cells using XY fluorescence in situ hybridization (FISH).
• Gene expression analysis comparing fetal and maternal cells via stem cell microarray.

Main Results:

• Twenty-eight candidate fetal cell marker genes were identified.
• Five genes coded for cell surface proteins not expressed in maternal blood.

Conclusions:

• The proteins encoded by MMP14, MCAM, KCNQ4, CLDN6, and F3 are potential markers for fetal cell enrichment.
• These markers could significantly advance non-invasive prenatal diagnostics by improving fetal cell isolation.