Scientists directly observe DNA strands zipping together for the first time
New CapabilitiesImaging confirms the two-decade-old 'DNA zipper' model and reveals how metal ions bridge matching helices
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Overview
Updated 1 hour agoFor 20 years, biologists knew matching DNA duplexes could pair up despite carrying identical negative charges, but no one had seen how. Researchers at the universities of York and Sheffield now have: metal ions, including nickel, magnesium, and calcium, nestle into the helices' grooves and zip them together, groove for groove.
The images confirm the 'DNA zipper' model proposed in 2004, and show pairing is not uniform: certain sequences form far stronger contacts. Those hotspots could reveal genome regions central to recombination and cancer, and let engineers build DNA structures that assemble themselves.
Why it matters
Knowing how DNA pairs up could reveal the genome regions involved in recombination and cancer, and enable custom-built DNA structures.
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People Involved
Organizations Involved
UK university whose physics team, with Sheffield's, carried out the first direct imaging of DNA duplexes pairing.
UK university whose researchers captured the topographical images of paired DNA helices.
Where Alexey Kornyshev and collaborators proposed the DNA zipper model two decades ago.
Timeline
January 2004 September 2026
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First direct observation of DNA zippering announced
Latest PublicationStudy appears in Nucleic Acids Research; teams image two helices pairing groove to groove, confirming the zipper model.
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Imaging study posted as preprint
ResearchThe York-Sheffield team posts 'Imaging and mechanism of DNA–DNA recognition mediated by divalent ions' to bioRxiv.
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DNA zipper model proposed
TheoryImperial College London's Alexey Kornyshev proposes that salt ions let matching DNA helices align like interlocking spiral staircases.
Historical Context
2 moments from history that rhyme with this story — and how they unfolded.
Watson and Crick's double helix (1953)
James Watson and Francis Crick proposed the DNA double helix based largely on Rosalind Franklin's X-ray diffraction images. The structure explained how genetic material could copy itself, but no one had directly seen the molecule at that resolution.
The model reshaped biology within a decade, leading to the genetic code and molecular biology.
Direct visual confirmation came progressively through sequencing, crystallography, and cryo-electron microscopy.
Like Kornyshev's zipper theory, a powerful structural model began as inference from indirect evidence before direct imaging arrived much later.
Meselson–Stahl experiment (1958)
Matthew Meselson and Franklin Stahl grew bacteria in a heavy nitrogen isotope, then switched to normal nitrogen. After two generations, DNA's density pattern matched semiconservative replication, settling a three-way debate about how DNA copies itself.
Confirmed the Watson-Crick prediction of how DNA replicates.
Became a model experiment for directly testing a hypothesis against competing explanations.
The York-Sheffield work similarly uses direct measurement, atomic force microscopy, to distinguish an actual mechanism from decades of competing models.
