Core Viewpoint - The study published in "Science" reveals that LINE-1 (L1) elements, known as genetic "parasites," play a significant role in destabilizing cancer genomes, challenging traditional views on cancer evolution [1][2] Group 1: Research Findings - The research focuses on the abnormal activity of L1 elements in tumors, utilizing long-read sequencing technology to comprehensively depict the impact of these "jumping genes" on cancer genome structure [1] - A total of 6,418 jumping events were observed in 10 tumors with high L1 activity, with approximately 1 in every 40 jumps leading to large-scale structural alterations, including deletions and translocations, which are often undetectable by traditional short-read sequencing [1] Group 2: Implications for Cancer Evolution - About 65% of L1 events occur in the early stages of tumor evolution, primarily before the significant event of "whole-genome doubling," indicating that L1 activity is a crucial factor in early genomic reshaping during cancer formation rather than a consequence [2] - The lower methylation levels of L1 promoter regions in tumor tissues align with the hypothesis that epigenetic changes may awaken these dormant elements, providing new insights into the origins of genomic instability in cancer [2] Group 3: Future Directions - The findings emphasize the potential value of long-read sequencing in cancer research, suggesting it may guide the development of early intervention strategies in the future [2]