The role of cytosine methylation on charge transport through a DNA strand

The Journal of Chemical Physics
Jianqing QiM P Anantram

Abstract

Cytosine methylation has been found to play a crucial role in various biological processes, including a number of human diseases. The detection of this small modification remains challenging. In this work, we computationally explore the possibility of detecting methylated DNA strands through direct electrical conductance measurements. Using density functional theory and the Landauer-Büttiker method, we study the electronic properties and charge transport through an eight base-pair methylated DNA strand and its native counterpart. We first analyze the effect of cytosine methylation on the tight-binding parameters of two DNA strands and then model the transmission of the electrons and conductance through the strands both with and without decoherence. We find that the main difference of the tight-binding parameters between the native DNA and the methylated DNA lies in the on-site energies of (methylated) cytosine bases. The intra- and inter-strand hopping integrals between two nearest neighboring guanine base and (methylated) cytosine base also change with the addition of the methyl groups. Our calculations show that in the phase-coherent limit, the transmission of the methylated strand is close to the native strand when the energ...Continue Reading

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Citations

Jul 3, 2017·The Journal of Chemical Physics·Fernanda B NunesSergio d'Almeida Sanchez
Jan 7, 2021·Molecular and Cellular Biochemistry·Lijun HeSunil R Patil
Jul 1, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Hashem MohammadM P Anantram

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