La imagen en vivo captura el plegamiento del ADN en células de esperma por primera vez
Researchers at Nano Life Science Institute (WPI-NanoLSI), Kanazawa University and colleagues have achieved a breakthrough in understanding sperm DNA packaging. Using high-speed atomic force microscopy (HS-AFM), they captured the real-time process of protamine (PRM)-induced DNA condensation, providing critical insights into fertility, genome stability, and future applications in medicine. Their findings are published in Nucleic Acids Research. Why This Discovery is Important In most cells, DNA is wrapped around proteins called histones, allowing it to be loosely packed and accessible for gene activity. However, in sperm cells, histones are replaced by protamines, which enable extreme DNA condensation. This compaction is essential for protecting genetic material during fertilization, ensuring efficient transport of DNA to the egg, and contributing to fertility and embryo development. Despite its importance, the precise steps of how protamines condense DNA into highly stable structures have remained unclear. Previous imaging…
