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Selection of the optimal manual method of cell free fetal DNA isolation from maternal plasma

  • Gabriela Repiská EMAIL logo , Tatiana Sedláčková , Tomáš Szemes , Peter Celec and Gabriel Minárik
Published/Copyright: December 8, 2012

Abstract

Background: The cell free fetal DNA (cffDNA) present in plasma of pregnant women represents an important alternative source of DNA for non-invasive prenatal diagnosis. Due to the low quantity and increased fragmentation of cffDNA, the choice of DNA extraction method is a crucial step for downstream analyses.

Methods: In our study, the three spin column-based kits for isolation of cffDNA [DNA Blood Mini Kit (DBM), DSP Virus Kit (DSP) and Circulating Nucleic Acid (CNA) Kit] were compared. Original and optimized protocol were used in comparison and applied in the two phases of the study.

Results: A statistically significant difference in performance of the kits was determined based on the comparison of genomic equivalents per mL (GEq/mL) values (p<0.0001). The GEq/mL of isolated DNA was significantly higher using CNA and DSP Kits than DBM Kit. The CNA Kit and DSP Kit did not significantly differ in the GEq/mL values, although all tested samples isolated with CNA Kit showed higher values.

Conclusions: According to our results the commonly used DBM Kit could be successfully replaced with CNA or DSP Kits. The replacement could be beneficial in qualitative as well quantitative tests (e.g., gender determination, aneuploidy detection) when the isolation yield limits subsequent analyses. However, there is an important decision to be made when switching DBM Kit for DSP or CNA Kits. The price of DBM Kit is two and six times lower than DSP and CNA Kits, respectively.


Corresponding author: Gabriela Repiská, Comenius University in Bratislava Faculty of Medicine, Institute of Molecular Biomedicine, Sasinkova 4, 811 08 Bratislava, Slovakia

The study was funded by Slovak research and Development Agency (VMSP-II-0030–09 and APVV-0720–10), by Grant Agency of Ministry of Education, Science, Research and Sport of the Slovak Republic (VEGA-1/0285/11) and by Grant of Comenius University in Bratislava (UK/190/2012).

Conflict of interest statement

Authors’ conflict of interest disclosure: The authors stated that there are no conflicts of interest regarding the publication of this article. Research funding played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.

Research funding: None declared.

Employment or leadership: None declared.

Honorarium: None declared.

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Received: 2012-06-29
Accepted: 2012-11-07
Published Online: 2012-12-08
Published in Print: 2013-06-01

©2013 by Walter de Gruyter Berlin Boston

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