A new methodology to preserve the original proportion and integrity of cell‐free fetal DNA in maternal plasma during sample processing and storage

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Abstract
Objective To develop a standardized blood collection device that preserves fetal cell-free DNA and minimizes the cell-free DNA background in maternal plasma. Methods Blood samples were drawn from healthy pregnant donors into K3EDTA (BD vacutainer®) and Cell-free DNA™ BCT tubes (Streck®, Inc.) and kept at ambient temperature. Plasma was separated by centrifugation and cell-free DNA was extracted. Cell-free DNA from plasma was quantified by quantitative real-time polymerase chain reaction. Results Blood drawn into Cell-free DNA™ BCT tubes showed no change in the original proportion of fetal cell-free DNA during a 14-day storage period at ambient temperature. Conversely, maternal blood drawn into K3EDTA tubes showed a steady reduction in the original proportion of fetal cell-free DNA over the same time period. Using maternal plasma stored in Cell-free DNA™ BCT tubes for 14 days, fetal cell-free DNA was amplified 80-fold using whole genome amplification (WGA). Conclusion Using Streck's Cell-free DNA™ BCT tubes, it is possible to preserve the original proportion of fetal cell-free DNA for extended times as well as minimize the post-sampling maternal cell-free DNA background. Preserved in this way, fetal cell-free DNA can be amplified by WGA technology to be used in prenatal diagnostic tests. Copyright © 2010 John Wiley & Sons, Ltd.