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Liu Z, Xu H, Wang Y, Yang F, Yin Y, Zhang S, Weng Z, Song Z, Wang Z. Improved DNA straightening and attachment via optimal Mg 2+ ionic bonding under electric field for AFM imaging in liquid phase. Micron 2019; 124:102678. [PMID: 31181466 DOI: 10.1016/j.micron.2019.04.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/28/2019] [Accepted: 04/28/2019] [Indexed: 10/26/2022]
Abstract
In this research, a novel method is proposed to improve DNA straightening under an applied electric field to facilitate imaging in a liquid phase by modifying the substrate with varying Mg2+ ion concentrations. A two-dimensional network of DNA structures was successfully stretched on Mg2+-modified mica substrates under a DC electric field (1 V, 1 A) and imaged in gaseous and aqueous phases by atomic force microscopy. The results revealed that an optimum concentration of Mg2+ ion (4.17 μmol/ml) allowed DNA straightening under an electric field, thus facilitating its imaging in the liquid phase. Furthermore, DNA adhesion under different concentrations of Mg2+ was measured and a maximum adhesion force of 76.19 pN was achieved. This vital work has great potential in gene knockout and targeted gene editing.
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Affiliation(s)
- Ziyu Liu
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China
| | - Hongmei Xu
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China.
| | - Ying Wang
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China
| | - Fan Yang
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China
| | - Yaoting Yin
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China
| | - Sheng Zhang
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China
| | - Zhankun Weng
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China
| | - Zhengxun Song
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China
| | - Zuobin Wang
- CNM & JR3CN, Changchun University of Science and Technology, Changchun, 130022, China; IRAC & JR3CN, University of Bedfordshire, Luton, LU1 3JU, UK
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