Artículo
A Reliable Method for Quantifying Plasma Cell-Free DNA Using an Internal Standard Strategy: Evaluation in a Cohort of Non-Pregnant and Pregnant Women
Cepeda, Paula Julieta
; Racca, María Emilia
; Rossetti, María Florencia
; Cardozo, M. Alejandra; Gaydou, Luisa; Luque, Enrique Hugo
; Muñoz-de-Toro, Mónica; Milesi, Maria Mercedes
; Varayoud, Jorgelina Guadalupe
; Ramos, Jorge Guillermo
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Fecha de publicación:
12/2023
Editorial:
SAGE Publications
Revista:
Reproductive Sciences
ISSN:
1933-7191
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 102 and 106 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.
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Articulos(ISAL)
Articulos de INSTITUTO DE SALUD Y AMBIENTE DEL LITORAL
Articulos de INSTITUTO DE SALUD Y AMBIENTE DEL LITORAL
Citación
Cepeda, Paula Julieta; Racca, María Emilia; Rossetti, María Florencia; Cardozo, M. Alejandra; Gaydou, Luisa; et al.; A Reliable Method for Quantifying Plasma Cell-Free DNA Using an Internal Standard Strategy: Evaluation in a Cohort of Non-Pregnant and Pregnant Women; SAGE Publications; Reproductive Sciences; 12-2023; 1-10
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