DNA methylome profiling of circulating tumor cells in lung cancer at single base-pair resolution

• Published in: Oncogene 2021-03, Vol.40 (10), p.1884-1895
• Main Authors: Zhao, Lei, Wu, Xiaohong, Zheng, Junnian, Dong, Dong
• Format: Article
• Language: English
• Subjects: 45; 631/337/176/1988; 631/67/69; Apoptosis; Biological markers; Bisulfite; Cancer cells; Carcinogenesis; Cell Biology; Cell Count; Cell Line, Tumor; Deoxyribonucleic acid; DNA; DNA fingerprinting; DNA methylation; DNA Methylation - genetics; Epigenome - genetics; Epithelial-Mesenchymal Transition - genetics; Female; Gene expression; Genetic aspects; Genomes; Health aspects; Human Genetics; Humans; Identification and classification; Internal Medicine; Laser Capture Microdissection; Lung cancer; Lung Neoplasms - blood; Lung Neoplasms - genetics; Lung Neoplasms - pathology; Male; Medicine; Medicine & Public Health; Mesenchyme; Metastases; Neoplasm Proteins - genetics; Neoplastic Cells, Circulating - metabolism; Neoplastic Cells, Circulating - pathology; Oncology; Promoter Regions, Genetic - genetics; Tumor cells
• ISSN: 0950-9232; 1476-5594
• DOI: 10.1038/s41388-021-01657-0

DNA methylation plays a pivotal role in regulating cellular processes, and altered DNA methylation pattern is a general hallmark of cancer. However, DNA methylome in circulating tumor cells (CTCs) is still a mystery due to the lack of proper analytical techniques. We introduced an efficient workflow, LCM–µWGBS, which can efficiently profile the DNA methylation of microdissected CTC samples. LCM–µWGBS combines the laser capture microdissection (LCM)-based CTC capture method and whole-genome bisulfite sequencing in very small CTC population (µWGBS) to gain insight into the DNA methylation landscape of CTCs. We herein profiled the DNA methylome of CTCs from lung cancer patients. Deriving from a comprehensive analysis of CTC methylome, a unique “CTC DNA methylation signature” that is distinct from primary lung cancer tissues was identified. Further analysis showed that promoter hypermethylation of epithelial genes is a hallmark of stable epithelial–mesenchymal transition process. Moreover, it has been suggested that CTCs are endowed with a stemness-related feature during dissemination and metastasis. This work constitutes a unique DNA methylation analysis of CTCs at single base-pair resolution, which might facilitate to propose noninvasive CTC DNA methylation biomarkers contributing to clinical diagnosis.