Details

Autor(en) / Beteiligte

• Cepeda, Julieta
• Racca, M. Emilia
• Rossetti, M. Florencia
• Cardozo, M. Alejandra
• Gaydou, Luisa
• Luque, Enrique H.
• Muñoz-de-Toro, Mónica
• Milesi, M. Mercedes
• Varayoud, Jorgelina
• Ramos, Jorge G.

Titel

A Reliable Method for Quantifying Plasma Cell-Free DNA Using an Internal Standard Strategy: Evaluation in a Cohort of Non-Pregnant and Pregnant Women

Ist Teil von

• Reproductive sciences (Thousand Oaks, Calif.), 2024-04, Vol.31 (4), p.987-996

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2024

Quelle

SpringerLink

Beschreibungen/Notizen

• The use of plasma cell-free DNA (cfDNA) as a useful biomarker in obstetric clinical practice has been delayed due to the lack of reliable quantification protocols. We developed a protocol to quantify plasma cfDNA using an internal standard strategy to overcome difficulties posed by low levels and high fragmentation of cfDNA. cfDNA was isolated from plasma samples of non-pregnant (NP, n  = 26) and pregnant (P, n  = 26) women using a commercial kit and several elution volumes were evaluated. qPCR parameters were optimized for cfDNA quantification, and several quantities of a recombinant standard were evaluated as internal standard. Absolute quantification was performed using a standard curve and the quality of the complete method was evaluated. cfDNA was eluted in a 50-μl volume, actin-β ( ACTB ) was selected as the target gene, and qPCR parameters were optimized. The ACTB standard was constructed and 1000 copies were selected as internal standard. The standard curve showed R 2  = 0.993 and E  = 109.7%, and the linear dynamic range was defined between 10 2 and 10 6 ACTB copies/tube. Repeatability and reproducibility in terms of CV were 19% and up to 49.5% for ACTB copies per milliliter of plasma, respectively. The range of cfDNA levels was 428–18,851 copies/mL in NP women and 4031–2,019,363 copies/mL in P women, showing significant differences between the groups. We recommend the application of internal standard strategy for a reliable plasma cfDNA quantification. This methodology holds great potential for a future application in the obstetric field.