A new platform called Spatial Hi-C-RNA maps three-dimensional DNA architecture and gene expression together on the same tissue slice. Biologists often assume measuring active RNA transcripts alone captures every meaningful cell state across a tissue sample. Instead, the technique pairs direct physical contact points along packed DNA fibers with the RNA messages produced at those exact tissue locations.
Inside a cell nucleus, long DNA strands fold into loops and compartments that physically push regulatory switches toward specific genes. This folding functions like an origami blueprint, dictating which parts of the genetic code remain exposed to molecular machinery. The platform detects these physical contact points across intact tissue while simultaneously gathering local RNA transcripts at near-single-cell resolution. By preserving tissue coordinates, it matches structural genome changes directly to anatomical landmarks.
The research team tested the platform across mouse brain samples, developing mouse embryos, and human melanoma tissue. In mouse embryos, the measurements resolved how DNA folding and gene activity shift together as young neurons mature across developmental stages. In human melanoma, the physical chromatin boundaries separated tumor subregions that RNA measurements failed to detect on their own.
The authors report that this framework allows scientists to investigate relationships between genome structure and biological function directly within native tissue environments. The method links structural transitions in tumor compartments and domain boundaries to specific regulatory programs during disease progression.