Evolving strategies for lineage tracing: Genetic markers, synthetic barcodes, and natural variants.

Elucidating cell fate decision-making requires linking lineage history to dynamic phenotypic states. Driven by single-cell sequencing and genome engineering, lineage tracing has evolved from observational studies into a multidimensional, high-throughput discipline. Here, we synthesize its three methodological pillars: prospective tracking via genetic markers, high-throughput mapping using synthetic barcodes, and retrospective tracing leveraging endogenous natural variants. We survey their integration with multi-omics and spatial profiling, alongside computational approaches to decode cell fates from lineage data. By detailing each approach's trade-offs, we offer a systematic guide for experimental design and highlight emerging frontiers for translating precision clonal analysis into the clinic.