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arxiv: 2606.10955 · v1 · pith:ISAPTQG6new · submitted 2026-06-09 · 🧬 q-bio.BM · cond-mat.soft· q-bio.QM

A kinetic model of shear-induced rupture of short dsDNA

Ayman Hussein , Ralf Bundschuh This is my paper

Pith reviewed 2026-06-27 10:53 UTC · model grok-4.3

classification 🧬 q-bio.BM cond-mat.softq-bio.QM
keywords dsDNAshear forcekinetic modelnucleation-zippermaster equationhelical geometryforce-induced dissociationtransition state distance
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The pith

A kinetic model shows that dsDNA's helical geometry is required to predict shear-induced rupture rates accurately.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The authors construct a master equation model for the dissociation of short double-stranded DNA under shear force. The model treats rupture as a nucleation-zipper process where base pairs open one at a time, with force-dependent rates. When applied to a specific DNA construct linking gold nanoparticles, it matches observed room-temperature dissociation rates. The work demonstrates that using the actual three-dimensional helical shape of DNA, rather than a simplified rod, is necessary to calculate the relevant end-to-end distance under shear. This provides a consistent explanation for experiments in different force ranges and examines temperature effects on the process.

Core claim

The paper establishes a master equation framework based on a force-dependent nucleation-zipper pathway with single-base transitions for calculating dissociation rates and transition state distances of short dsDNA under shear. Applied to a DNA-gold nanoparticle-DNA construct, the model reproduces experimental room-temperature data and unifies interpretations of prior measurements across force regimes by showing that the three-dimensional helical geometry is essential for defining the end-to-end distance in the rod-like polymer model.

What carries the argument

Master equation framework on force-dependent nucleation-zipper pathway with single-base transitions, using a rod-like polymer model that incorporates dsDNA's three-dimensional helical geometry for end-to-end distance under shear.

If this is right

  • The model accurately reproduces experimental data for the DNA-gold nanoparticle-DNA construct under constant shear force at room temperature.
  • It provides a unified interpretation of prior measurements on similarly sheared duplexes across all force regimes.
  • Extracted transition state distances remain robust to variations in ssDNA polymer parameters within the experimentally relevant regime.
  • The framework captures globally-heated rupture while identifying complications from localized plasmonic heating in gold nanoparticle-coupled constructs.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • This approach could enable more precise design of force-responsive DNA nanostructures.
  • Similar kinetic models might be adapted for other shear-force scenarios in biopolymers.
  • The robustness to polymer parameters suggests the helical geometry effect dominates the predictions.
  • Future experiments could test the temperature dependence predictions in non-plasmonic setups.

Load-bearing premise

The dissociation of short dsDNA under shear follows a force-dependent nucleation-zipper pathway consisting of single-base transitions.

What would settle it

Experimental dissociation rates for short dsDNA under shear in the studied force regime that do not match the model's calculated rates would falsify the claim that the framework accurately describes the kinetics.

Figures

Figures reproduced from arXiv: 2606.10955 by Ayman Hussein, Ralf Bundschuh.

Figure 1
Figure 1. Figure 1: Schematic of the bead-DNA-AuNP-DNA-bead setup in a dual-trap under constant shear force (F). Zoomed [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: A comparison of the different analyses of the experimental [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Demonstration of the duplex rupture under shear-force (F) for a 4bp duplex. The numbers in [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Model results for dark rupture, global temperature of [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: (a) Model results for dark rupture using contour length as end to end distance of dsDNA, and (b) The [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: The model results for other experimentally-motivated combinations of interphosphate distance and per [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: The transition state distance (TSD) obtained from Bell’s formula at experimental forces (red dots) and in [PITH_FULL_IMAGE:figures/full_fig_p011_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: A comparison of the different analyses of the experimental [PITH_FULL_IMAGE:figures/full_fig_p011_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: A schematic of a single-base transition barrier between [PITH_FULL_IMAGE:figures/full_fig_p015_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Comparison of the global interpolation formula (GIF), the rod-like model, and the Marko-Siggia inter [PITH_FULL_IMAGE:figures/full_fig_p021_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Two 3D views of the helical geometry of dsDNA. The starting point (blue) is on the first base of the first [PITH_FULL_IMAGE:figures/full_fig_p022_11.png] view at source ↗
read the original abstract

Force-induced dissociation of short double-stranded DNA (dsDNA) is central to single-molecule biophysics and DNA nanotechnology, yet a physically grounded kinetic description of shear-induced rupture for finite-length constructs remains lacking. Here we develop a master equation framework built on a force-dependent nucleation-zipper pathway with single-base transitions, enabling direct calculation of dissociation rates and transition state distances over a broad force range. Applied to a DNA-gold nanoparticle-DNA construct under constant shear force, the model accurately reproduces the experimental room-temperature data in the covered force regime and provides a unified interpretation of prior measurements on similarly sheared duplexes across all force regimes. A central result is that the three-dimensional helical geometry of dsDNA is essential for correctly defining the end to end distance under shear in the rod-like polymer model of short dsDNA. We further show that the extracted transition state distances are robust to variations in ssDNA polymer parameters within the experimentally relevant regime. Finally, we analyze the temperature dependence of the transition state distance and discuss how our framework captures globally-heated rupture while identifying the additional complications introduced by localized plasmonic heating in gold nanoparticle-coupled constructs. These results provide a predictive kinetic foundation for interpreting force-rupture experiments and for designing force- and temperature-actuated DNA nanostructures.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 0 minor

Summary. The manuscript develops a master equation framework for shear-induced rupture of short dsDNA based on a force-dependent nucleation-zipper pathway with single-base transitions. Applied to a DNA-gold nanoparticle-DNA construct under constant shear, the model reproduces room-temperature experimental data in the covered force regime and unifies prior measurements on similarly sheared duplexes across force regimes. A central result is that three-dimensional helical geometry is required to correctly define end-to-end distance in the rod-like polymer model of short dsDNA. Transition-state distances are shown to be robust to ssDNA polymer parameter variation, and the framework addresses temperature dependence while distinguishing global heating from plasmonic heating complications in nanoparticle-coupled constructs.

Significance. If the central claims hold, the work supplies a physically grounded, predictive kinetic description for force-rupture experiments that is directly usable for interpreting single-molecule data and designing force- and temperature-actuated DNA nanostructures. The explicit requirement for helical geometry, the robustness result, and the unified account across force regimes constitute substantive advances over existing phenomenological treatments. The handling of both global and localized heating further increases practical utility.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive and accurate summary of the manuscript, as well as for the recommendation to accept. The referee's assessment correctly identifies the central advances, including the necessity of helical geometry for the rod-like polymer model and the robustness of the transition-state distances.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The provided abstract and description outline a master-equation model on a force-dependent nucleation-zipper pathway with single-base transitions. It states that the model reproduces experimental data for a DNA-gold nanoparticle construct and unifies prior measurements, while emphasizing the necessity of 3D helical geometry for end-to-end distance in the rod-like polymer model. No equations, self-citations, or steps are quoted that reduce any claimed prediction or result to its inputs by construction (e.g., no fitted parameters renamed as predictions, no self-definitional loops, no load-bearing self-citations). The derivation is presented as independent of the target data and self-contained against external benchmarks, consistent with a normal non-circular outcome.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Only the abstract is available; no explicit free parameters, axioms, or invented entities are detailed beyond the general framework description.

pith-pipeline@v0.9.1-grok · 5756 in / 1101 out tokens · 28957 ms · 2026-06-27T10:53:13.129715+00:00 · methodology

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Reference graph

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