Evaluation of commercial kits for isolation and bisulfite conversion of circulating cell-free tumor DNA from blood

被引:5
作者
Kresse, Stine H. [1 ]
Brandt-Winge, Sara [1 ]
Pharo, Heidi [1 ]
Flatin, Bjornar T. B. [1 ]
Jeanmougin, Marine [1 ]
Vedeld, Hege Marie [1 ]
Lind, Guro E. [1 ,2 ]
机构
[1] Oslo Univ Hosp, Norwegian Radium Hosp, Inst Canc Res, Dept Mol Oncol, N-0379 Oslo, Norway
[2] Univ Oslo, Fac Math & Nat Sci, Dept Biosci, Oslo, Norway
关键词
Liquid biopsy; Circulating cell-free tumor DNA; cfDNA; ctDNA; Plasma; cfDNA isolation; Bisulfite conversion; DNA methylation; Biomarker; ddPCR; PROCESSING PROTOCOLS; QUANTIFICATION;
D O I
10.1186/s13148-023-01563-0
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
BackgroundDNA methylation biomarkers in circulating cell-free DNA (cfDNA) have great clinical potential for cancer management. Most methods for DNA methylation analysis require bisulfite conversion, causing DNA degradation and loss. This is particularly challenging for cfDNA, which is naturally fragmented and normally present in low amounts. The aim of the present study was to identify an optimal combination of cfDNA isolation and bisulfite conversion kits for downstream analysis of DNA methylation biomarkers in plasma.ResultsOf the five tested bisulfite conversion kits (EpiJET Bisulfite Conversion Kit, EpiTect Plus DNA Bisulfite Kit (EpiTect), EZ DNA Methylation-Direct Kit, Imprint DNA Modification Kit (Imprint) and Premium Bisulfite Kit), the highest and lowest DNA yield and recovery were achieved using the EpiTect kit and the Imprint kit, respectively, with more than double the amount of DNA for the EpiTect kit. Of the three tested cfDNA isolation kits (Maxwell RSC ccfDNA Plasma Kit, QIAamp Circulating Nucleic Acid Kit (CNA) and QIAamp MinElute ccfDNA Mini Kit), the CNA kit yielded around twice as much cfDNA compared to the two others kits, although with more high molecular weight DNA present. When comparing various combinations of cfDNA isolation kits and bisulfite conversion kits, the CNA kit and the EpiTect kit were identified as the best-performing combination, resulting in the highest yield of bisulfite converted cfDNA from normal plasma, as measured by droplet digital PCR (ddPCR). As a proof of principle, this kit combination was used to process plasma samples from 13 colorectal cancer patients for subsequent ddPCR methylation analysis of BCAT1 and IKZF1. Methylation of BCAT1 and/or IKZF1 was identified in 6/10 (60%) stage IV patients and 1/3 (33%) stage III patients.ConclusionsBased on a thorough evaluation of five bisulfite conversion kits and three cfDNA isolation kits, both individually and in combination, the CNA kit and the EpiTect kit were identified as the best-performing kit combination, with highest DNA yield and recovery across a range of DNA input amounts. The combination was successfully used for detection of clinically relevant DNA methylation biomarkers in plasma from cancer patients.
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页数:14
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