The effects of diffusion on an exonuclease/nanopore-based DNA sequencing engine

作者：Reiner Joseph E; Balijepalli Arvind; Robertson Joseph W F; Drown Bryon S; Burden Daniel L; Kasianowicz John J^*

来源：Journal of Chemical Physics, 2012, 137(21): 214903.

DOI：10.1063/1.4766363

Over 15 years ago, the ability to electrically detect and characterize individual polynucleotides as they are driven through a single protein ion channel was suggested as a potential method for rapidly sequencing DNA, base-by-base, in a ticker tape-like fashion. More recently, a variation of this method was proposed in which a nanopore would instead detect single nucleotides cleaved sequentially by an exonuclease enzyme in close proximity to one pore entrance. We analyze the exonuclease/nanopore-based DNA sequencing engine using analytical theory and computer simulations that describe nucleotide transport. The available data and analytical results suggest that the proposed method will be limited to reading %26lt;80 bases, imposed, in part, by the short lifetime each nucleotide spends in the vicinity of the detection element within the pore and the ability to accurately discriminate between the four mononucleotides.

• 出版日期2012-12-7