Recent advances in methodologies of epigenomics

Rapid methodological breakthroughs over the past ten years have transformed epigenomics from bulk, population-averaged assays into single-cell, multi-omic, and intracellular spatial investigations. This review surveys the interconnected technology pillars that now map the epigenome with unprecedented breadth and resolution. First, advances in next-generation and long-read sequencing empower investigators to chart chromatin accessibility, histone and DNA modifications, and three-dimensional higher-order chromatin structure in thousands of individual cells while retaining allele-specific information across kilobase-long molecules. Second, live-cell fluorescence probes and multiplexed chromatin tracing enable visualizing the dynamic organization of epigenetic marks and genome architecture of intact nuclei and tissues. Third, integrative platforms merge base-level reads with their native 3D coordinates, providing a holistic view of gene regulation in physiologic context. We distill key biological insights yielded by each methodology, discuss unresolved and persistent limitations, and outline future directions toward routine, cost-effective investigations. Together, these innovations are redefining how we interrogate chromatin biology in health and disease.