Identifying single bases in a DNA oligomer with electron tunnelling.

Identifying single bases in a DNA oligomer with electron tunnelling.
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用电子隧道识别DNA低聚物中的单个碱基。

DOI:
10.1038/nnano.2010.213
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发表时间:
2010-12
影响因子:
38.3
通讯作者:
--
中科院分区:
材料科学1区
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单分子DNA测序基于碱基通过纳米孔时的物理性质的测量,消除了对其他方法中使用的酶和试剂的需求。理论计算表明,电子隧穿可以识别单链DNA中的碱基,产生长时间的读数,并且不需要酶处理。最近的研究表明,隧道效应可以感知单个核苷酸和核苷。在这里,我们展示了用识别试剂功能化的隧道电极可以识别短DNA齐聚物中的单个碱基和其他碱基。单个碱基在识别连接中的停留时间约为一秒,但用数十皮牛顿的力将DNA拉过连接将产生每秒数十个碱基的读取速度。
Single-molecule DNA sequencing based on measuring the physical properties of bases as they pass through a nanopore eliminates the need for the enzymes and reagents used in other approaches. Theoretical calculations indicate that electron tunneling could identify bases in single-stranded DNA, yielding long reads and eliminating enzymatic processing. It was shown recently that tunneling can sense individual nucleotides and nucleosides. Here, we show that tunneling electrodes functionalized with recognition reagents can identify a single base flanked by other bases in a short DNA oligomer. The residence time of a single base in a recognition junction is on the order of a second, but pulling the DNA through the junction with a force of tens of piconewtons would yield reading speeds of tens of bases per second.
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