.webp&w=384&q=75){kind=logo}
Loading, please wait...
Loading, please wait...
Current research into DNA electron attachment uncovers how fundamental molecular interactions drive radiation-induced cellular damage. A recent study by Arora S et al. investigated the effects of base pairing and stacking on shape resonances in adenine-thymine (AT) pairs. By identifying seven π*-shape resonances, researchers have provided a clearer picture of how low-energy electrons interact with genetic material.
The study utilized a DLPNO-based equation of motion coupled-cluster approach to compute resonance positions. Specifically, natural orbital analysis showed that low-energy resonances result in significant electron density delocalization. Furthermore, this delocalization becomes more pronounced in stacked geometries, which effectively stabilizes the resonance states. Consequently, the increased lifetimes of these states may enhance the probability of chemical modifications in the DNA backbone. Moreover, these findings suggest that the physical arrangement of DNA plays a protective or sensitizing role during electron exposure.
In addition to providing theoretical insights, these results are highly relevant to clinical radiobiology. Low-energy electrons are the most abundant secondary products of ionizing radiation. Understanding how they attach to DNA is crucial for refining radiotherapy protocols. Additionally, this knowledge could lead to the development of better radiosensitizers that exploit these specific resonance pathways. Therefore, oncologists and radiologists must stay informed about these biophysical mechanisms to better predict tissue responses to radiation.
When low-energy electrons attach to DNA bases via shape resonances, they form transient anions. These anions can subsequently decay through dissociative electron attachment, which ruptures the sugar-phosphate backbone or the N-glycosidic bond, causing strand breaks.
The stacked geometry allows for the delocalization of electron density across multiple bases. This stabilization increases the lifetime of the resonance state, providing more time for the chemical reactions that lead to permanent DNA damage to occur.
Disclaimer: This content is for informational and educational purposes only and is not intended as medical advice. It should not be used to diagnose, treat, or manage any health condition. Refer to the latest local and national guidelines for clinical practice.
References
Arora S et al. Electron Attachment-Induced Shape Resonances in AT Base Pairs. J Phys Chem A. 2026 Jun 17. doi: 10.1021/acs.jpca.6c02180. PMID: 42310489.
Read summarized clinical updates, watch expert medical content, and earn CME certifications right from your smartphone.
Open your smartphone camera to scan and install.
A computational study reveals how base pairing and stacking interactions modulate electron attachment-induced shape resonances in DNA. By stabilizing these states, molecular structures influence the likelihood of radiation-induced strand breaks, providing essential insights for oncology and radiology.
4 months ago
Depemokimab offers twice-yearly dosing for severe eosinophilic asthma and chronic rhinosinusitis with nasal polyps, significantly cutting exacerbations and hospital admissions.
4 days back
A novel copper metal-organic framework hydrogel remodels the uterine microenvironment to stimulate robust endometrial regeneration, reduce intrauterine fibrosis, and restore reproductive fertility, offering a groundbreaking strategy for managing refractory endometrial damage and Asherman syndrome.
4 days back
New research reveals that non-ablative radiotherapy suppresses ventricular tachycardia by increasing conduction velocity via NaV1.5 upregulation and action potential prolongation. However, sustained sodium current elevation and depressed calcium handling highlight the need for careful clinical translation.
6 days back
A single-cell transcriptomic atlas reveals how peripheral nerve injuries cause dorsal root ganglion remodeling. By evaluating proximal nerve crush and resection, researchers identify distinct glial and immune programs that resolve neuropathic pain and promote regeneration.
4 days back
A breakthrough study demonstrates that fullerol-primed extracellular vesicles generated in a 3D SECCS bioreactor attenuate ferroptosis and restore myogenic regeneration in diabetes via the FOXO3 pathway, offering a cell-free therapeutic strategy for diabetic musculoskeletal degeneration.
4 days back
