Pull to refresh
Logo
Scientists directly observe DNA strands zipping together for the first time

Scientists directly observe DNA strands zipping together for the first time

New Capabilities

Imaging confirms the two-decade-old 'DNA zipper' model and reveals how metal ions bridge matching helices

Yesterday: First direct observation of DNA zippering announced

Overview

Updated 1 hour ago

For 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.

Questions about this story

Free account needed to ask — your question is kept and asked for you right after sign-up. Answers are public.

No questions yet — be the first to ask.

Key Indicators

2
Universities that made the observation
University of York and University of Sheffield worked together on the imaging.
3
Divalent ions shown to bridge DNA helices
Nickel, magnesium, and calcium all act as molecular bridges between grooves.
2 decades
Time between the DNA zipper theory and its confirmation
Alexey Kornyshev proposed the model in the early 2000s; this study first images it.

Voices

Curated perspectives — historical figures and your fellow readers.

Ever wondered what historical figures would say about today's headlines?

Sign up to generate historical perspectives on this story.

Play

Exploring all sides of a story is often best achieved with Play.

Most of these play right now — no account needed. Sign up to save scores, keep a streak, and unlock Debate and Predict. Log in Sign Up
Predict 3 ways this could play out. Back the one you believe — contrarian picks score more when a scenario has a resolution date. Log in to play

People Involved

Organizations Involved

Timeline

January 2004 September 2026

3 events Latest: Yesterday
  1. First direct observation of DNA zippering announced

    Latest Publication

    Study appears in Nucleic Acids Research; teams image two helices pairing groove to groove, confirming the zipper model.

  2. Imaging study posted as preprint

    Research

    The York-Sheffield team posts 'Imaging and mechanism of DNA–DNA recognition mediated by divalent ions' to bioRxiv.

  3. DNA zipper model proposed

    Theory

    Imperial 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.

April 1953

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.

Then

The model reshaped biology within a decade, leading to the genetic code and molecular biology.

Now

Direct visual confirmation came progressively through sequencing, crystallography, and cryo-electron microscopy.

Why this matters now

Like Kornyshev's zipper theory, a powerful structural model began as inference from indirect evidence before direct imaging arrived much later.

1958

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.

Then

Confirmed the Watson-Crick prediction of how DNA replicates.

Now

Became a model experiment for directly testing a hypothesis against competing explanations.

Why this matters now

The York-Sheffield work similarly uses direct measurement, atomic force microscopy, to distinguish an actual mechanism from decades of competing models.

Sources

(7)