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Modulation of DNA Nanostructure Morphology by Metal Ions and Temperature: An AFM Study
Jiani Li1,2, Jingyu Wang1,2, Xia Wang1,2
1International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology, Changchun 130022, China.
Nanomaterials (Basel, Switzerland)
|May 12, 2026
Summary
Metal ions and temperature significantly alter DNA structure. Different ions cause unique aggregation or damage, while heat induces melting, impacting DNA morphology.
Area of Science:
- Molecular Biology
- Biophysics
- Nanotechnology
Background:
- DNA structure stability is crucial for cellular function.
- Environmental factors like metal ions and temperature influence DNA conformation.
- Systematic visualization of these effects is lacking.
Purpose of the Study:
- Investigate the morphological effects of various metal ions and temperature on DNA structure.
- Quantify the differential impacts of alkali, alkaline earth, and transition metals.
- Understand environmental modulation of DNA conformation.
Main Methods:
- Atomic Force Microscopy (AFM) was utilized.
- Examined the effects of Na+, K+, Mg2+, Ca2+, and Cu2+ ions.
- Assessed DNA structure at varying temperatures.
Main Results:
- Monovalent ions (Na+, K+) induced dendritic DNA aggregation.
- Divalent ions (Mg2+, Ca2+) formed compact, cross-linked DNA networks.
- Cu2+ caused DNA distortion and strand scission.
- Elevated temperatures led to DNA melting and single-stranded globule formation.
Conclusions:
- Environmental factors critically govern DNA morphology.
- Metal ions modulate DNA structure through charge neutralization, bridging, or direct coordination.
- Temperature-induced melting transitions DNA from double to single strands.
- Findings offer insights for nanotechnology and molecular biology.
