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A novel method for depositing erythroid cells onto glass slides for fetal cell analysis
E J Collarini1, D Nagy, C A Cain
1Chief Technology Office, Roche Diagnostics, Berkeley, California, USA.
Background:
We have developed a method for selecting erythroblasts from blood, the first step toward identifying fetal cells in maternal blood for diagnostic purposes. Because the selection method results in a large number of positive cells, we needed to develop new methods to deposit the cells onto slides and to modify in situ hybridization procedures to enable detection of fetal cells.
Methods:
We utilized Nunc flaskettes to increase the slide surface area available for cell deposition. The ability of erythroid lineage cells to adhere to several surface modifications was examined. In situ hybridization methods were tested to find the best approach that is compatible with these cell preparations.
Results:
The best glass slide coating for erythroid cells was found to be an antibody to glycophorin A, a red cell surface antigen. We were able to get excellent in situ hybridization signals in cells on flaskettes by modifying fixation and pretreatment parameters.
Conclusions:
The methods described here appear to be the best way of attaching a large number of erythroid lineage cells to slides and of detecting them by in situ hybridization.
