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• W4362595536 abstract "Abstract Introduction: DNA methylation at CpG nucleotide sites in eukaryotes is a key epigenetic mark that can help regulate gene expression. Specific changes in CpG methylation occur in many human cancers, making them a promising biomarker for early cancer detection. However, existing assays can be costly, lack specificity to regions of interest and often provide only semi-quantitative estimates of the methylation fraction. Here, we present a targeted methylome panel to decrease costs associated with next generation sequencing (NGS), methylation controls to calibrate quantitative assays and UMIs for accurate deduplication in low-diversity samples. Experimental Procedures: Genomic DNA (gDNA) was prepared for sequencing using the Twist Methylation Detection System consisting of enzymatic methylation conversion and hybrid capture using the Twist Human Methylome Panel. Twist’s synthetic CpG methylation level controls were spiked-in to gDNA and taken through the Twist Methylation Detection System to demonstrate their utility in calibrating methylation assays. Additionally, libraries were generated using cell free DNA (cfDNA) and either conventional or UMI-containing adapters to investigate the impact on quantitative detection and total unique coverage. Results: Using the Twist Human Methylome Panel at 150x raw coverage achieves uniform coverage with low off-bait Picard metrics. 6.59 million CpG sites were detected using a minimum depth of 10X. Target capture with the Human Methylome Panel allows for informative CpG calling of up to 82 samples on a single Illumina Novaseq S4 flowcell, compared to 3 samples per flowcell with a tradition whole-genome bisulfite sequencing (WGBS) assay. The Twist CpG methylation specific controls are constructed of 48 unique contrived sequences that contain a total of 8 different levels of methylation, ranging from 100% to 0%. Including these controls allows for quantitation of methylation levels in the experimental samples and qualification of the enzymatic conversion process. Conclusions: Our study leverages the Twist methylation detection portfolio to interrogate genome-wide methylation patterns for various applications. In combination, these tools can be used to design cost effective end-to-end assays. *For Research Use Only. Not for use in diagnostic procedures. Citation Format: Lydia Bonar, Kristin Butcher, Michael Bocek, Holly Corbitt, Bryan Hoglund, Cibelle Nassif, Patrick Cherry, Derek Murphy, Jean Challacombe, Esteban Toro. An end-to-end workflow for improved methylation detection. [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 6009." @default.
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• W4362595536 date "2023-04-04" @default.
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• W4362595536 title "Abstract 6009: An end-to-end workflow for improved methylation detection" @default.
• W4362595536 doi "https://doi.org/10.1158/1538-7445.am2023-6009" @default.
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