Researchers at the Salk Institute for Biological Studies have released a comprehensive single-cell atlas that provides new insights into how genes are regulated. By profiling over 86,000 nuclei from 16 different human tissue types, the team mapped two critical epigenetic systems simultaneously: 3D genome folding and DNA methylation. This work addresses a long-standing challenge in biology, where scientists previously studied these factors in isolation or across limited tissue samples. Understanding the interplay between the physical structure of DNA and chemical markers is essential for identifying how non-coding genetic regions control gene activity in various cell types.
The findings show that different cells organize their genomes in unique ways. Some rely on large compartments to group active and inactive regions, while others use precise loops to connect switches to their target genes. This structural diversity confirms that cellular identity is layered and that regulatory systems can shift on different time scales. For instance, mature muscle cells might possess their final 3D structure even while their methylation patterns continue to mature, indicating a temporal mismatch in development.
This atlas serves as a functional blueprint for healthy gene regulation. By identifying where genetic risk factors for diseases like atrial fibrillation, diabetes, and schizophrenia act within specific tissues, the researchers have created a vital tool for the scientific community. The data is now available via an interactive web browser, which allows scientists to look at every tissue and subtype profiled in the study. This high-resolution resource provides the necessary training data to build better predictive models for variant effects and helps researchers trace how spatial organization changes throughout the progression of disease and aging.