Because DNA carries a negative electrical charge, two strands should push each other away. Yet inside cells, matching DNA helices regularly align—a process essential for genetic recombination and gene silencing.
A study in Nucleic Acids Research by the Universities of York and Sheffield has now captured this phenomenon for the first time.
Key Takeaways
- The "DNA Zipper": Using atomic force microscopy and computer simulations, researchers watched DNA pieces align groove-for-groove like an interlocking zipper.
- Molecular Bridges: Doubly charged metal ions settle into DNA grooves, acting as two-armed anchors that bridge the gap and neutralize repulsive charges.
- Proving a 20-Year Theory: The experiment confirms the "DNA zipper" model proposed two decades ago by Imperial College London researchers.
- Cancer & Biotech Implications: DNA doesn't pair uniformly; specific sequence "hotspots" form much stronger bonds. Understanding these interaction points could shed light on how mutations lead to cancer and help scientists engineer custom DNA nanotech.
