Integrated, multiplexed high-frequency electronic analysis of DNA in nanopores

纳米孔中 DNA 的集成、多重高频电子分析

• 批准号: 8545205
• 负责人: Kenneth L Shepard
• 金额: $ 46.87万
• 依托单位: COLUMBIA UNIV NEW YORK MORNINGSIDE
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-14 至 2015-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8545205
• 关键词: Address; Amplifiers; Biological; Caliber; Charge; Complex; Custom; DNA; DNA Sequence; DNA analysis; DNA-Directed DNA Polymerase; Detection; Development; Devices; Diagnosis; Diffusion; Electronics; Frequencies; Generations; Genome; Image; Length; Lipid Bilayers; Measurement; Measures; Membrane; Noise; Operating System; Optics; Photons; Post Technic; Process; Reaction; Reading; Research; Semiconductors; Signal Transduction; Sodium Chloride; Speed; System; Techniques; Technology; Testing; Time; Transducers; base; cost; design; detector; disorder prevention; fluorophore; improved; instrumentation; millisecond; nanofabrication; nanopore; operation; silicon nitride; single molecule; solid state

DESCRIPTION (provided by applicant): There is strong demand for third-generation DNA sequencing systems to be single-molecule, massively- parallel, and real-time. For single-molecule optical techniques, however, the signal from a single fluorophore is typically < 2500 photons/sec (equivalent to electrical current levels on the order of 50 fA). This leads to complex optics to try to collect every photon emitted and makes scaling of the platforms difficult. Additionally, synthesis reactions must be intentionally slowed to 1 Hz (or slower) to allow sufficient imaging times for these weak, noisy optical signals. The limitations of single-molecule optical techniques highlight key advantages of electrochemical detection approaches, which have significantly higher signal levels (typically three orders of magnitude higher), allowing for the possibility for high-bandwidth detection with the appropriate co-design of transducer, detector, and amplifier. Significant effort has been directed toward the development of nanopore technology as one potential bioelectronic transduction mechanism. Nanopores, however, have proved to be extremely limited by the relatively short time biomolecules spend in the charge-sensitive region of the pore. Restricted by the use of off- the-shelf electronics, the noise-limite bandwidth of nanopore measurements is typically less than 100 kHz, limiting the available sensing and actuation strategies and defying multiplexed integration which would be required for any sequencing application. In this four-year effort, we focus on improving significantly the noise-limited bandwidth of the detection electronics for nanopores allowing their full potential to be realized through close integration of the electronics and the pore while simultaneously supporting high levels of parallelism with multiple nanopores on the same detection substrate. We consider techniques for integrating both solid-state (Specific Aim 1) and biological pores (Specific Aim 3) onto these measurement substrates in a massively parallel manner (Specific Aim 2). The techniques we propose for leveraging commodity CMOS technology and co-integrating detection electronics are completely general and have significance to all other single-molecule bioelectronic transduction approaches. These high-bandwidth integrated electronics will also enable "closed-loop" sensing and actuation (Specific Aim 4), allowing dynamic manipulation of capture and translocation dynamics at microsecond (or better) timescales.

描述(申请人提供)：对单分子、大规模并行和实时的第三代DNA测序系统有强烈的需求。然而，对于单分子光学技术，来自单个荧光团的信号通常为2500光子/秒(相当于约50fA的电流水平)。这导致了复杂的光学系统，试图收集发射的每个光子，并使平台的缩放变得困难。此外，合成反应必须故意减慢到1赫兹(或更慢)，以便为这些微弱的、有噪音的光学信号提供足够的成像时间。单分子的局限性 光学技术突出了电化学检测方法的关键优势，这种方法具有显著更高的信号电平(通常高出三个数量级)，允许通过适当的传感器、检测器和放大器的共同设计实现高带宽检测。作为一种潜在的生物电子转导机制，纳米孔技术的发展已经做出了重大努力。然而，纳米孔被证明是极其有限的，因为生物分子在孔洞的电荷敏感区域停留的时间相对较短。受使用现成电子设备的限制，纳米孔测量的噪声限制带宽通常小于100 kHz，这限制了可用的传感和驱动策略，并阻碍了任何测序应用所需的多路集成。在这四年的努力中，我们专注于显著改善纳米孔探测电子设备的噪声限制带宽，使其能够充分发挥潜力 通过电子和孔的紧密集成来实现，同时在同一检测衬底上支持与多个纳米孔的高度平行。我们考虑将固态(特定目标1)和生物孔(特定目标3)以大规模并行的方式(特定目标2)集成到这些测量基质上的技术。我们提出的利用商用CMOS技术和共集成检测电子学的技术是完全通用的，对所有其他单分子生物电子转换方法具有重要意义。这些高带宽集成电子设备还将实现“闭环”传感和驱动(特定目标4)，允许在微秒(或更好)的时间尺度上动态操纵捕获和移位动力学。