Integrated CNT-FET Nanochannel for Single-Base DNA Sequencing
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Solution Overview
Problem
Current methods for DNA/RNA sequencing using nanopores struggle to achieve low-cost, high-accuracy, and rapid sequencing, as they face challenges in effectively controlling and sensing single nucleotide information.
Innovation Solution
Integration of a carbon nanotube field effect transistor (CNT-FET) with a nanochannel, where a target molecule is forced through a narrow nanochannel, allowing only one base to interact with an exposed carbon nanotube at a time, utilizing electrical fields and the nanochannel's physical constriction to measure and identify nucleotides based on changes in transistor current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a nanopore is used for DNA sequencing, then the sequencing cost can be reduced, but the accuracy in determining single nucleotide information deteriorates
Solution Approach 1:
The patent combines a carbon nanotube field effect transistor (CNT-FET) with a nanopore structure to create an integrated sensing system. The CNT-FET is positioned beneath the nanopore membrane, allowing the transistor channel to directly sense the passage of DNA through the nanopore. This merging of the transistor sensing element with the nanopore structure enables both cost-effective manufacturing and high-accuracy single nucleotide detection through electrical signal measurement.
Solution Approach 2:
The carbon nanotube acts as an intermediary between the nanopore and the detection system. The nanotube's high electrical conductivity and sensitivity to surface charge changes allow it to transduce the physical passage of DNA through the nanopore into measurable electrical signals, thereby improving measurement precision while maintaining the simplicity and low cost of the nanopore approach.
2Productivity
If DNA is forced through a nanopore, then sequencing speed can be improved, but the control over single base interaction with the sensor deteriorates
Solution Approach 1:
The patent creates a localized sensing zone within the nanopore where the CNT-FET is positioned directly beneath the pore. This local concentration of sensing capability ensures that when DNA passes through the nanopore, only the portion within the nanopore interacts with the highly sensitive transistor channel, providing precise control over single base interaction while maintaining high sequencing speed through continuous DNA translocation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise and efficient DNA/RNA sequencing by accurately determining the identity of single bases through changes in transistor current, potentially reducing sequencing costs and time while maintaining high accuracy.
Implementation Method 1
The target molecule is forced to the carbon nanotube by applying a gate voltage to a top electrode of the transistor
Implementation Method 2
measuring a transistor current while the single base of the target molecule is forced down to the exposed portion of the carbon nanotube in the nanochannel. The single base affects the transistor current
Implementation Method 3
The target molecule is frictionally restricted by the narrow thickness of the nanochannel causing the target molecule to stretch as the target molecule restrictedly translocates in the length direction
Data Source
AI summary
A mechanism is provided for base recognition of an integrated transistor and nanochannel. A target molecule is forced down to a carbon nanotube a single base at a time in the nanochannel by applying a gate voltage to a top electrode, and/or a narrow thickness of the nanochannel. The nanochannel exposes an exposed portion of the carbon nanotube at a bottom wall, and the top electrode is positioned over the exposed portion. The exposed portion of the carbon nanotube is smaller than the distance between bases to only accommodate the single base at a time. The target molecule is stretched by the narrow thickness and by applying a traverse voltage across a length direction of the nanochannel. The target molecule is frictionally restricted by the narrow thickness of the nanochannel to stretch is restrictedly translocates in the length direction. Current is measured to determine an identity of the single base.