Stochastic Super-Resolution Sequencing Overcoming Abbe Limit
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Solution Overview
Problem
Current DNA sequencing technologies face limitations in resolution due to Abbe's limit, which restricts the ability to distinguish between closely spaced molecules, and existing methods are either costly or time-consuming, necessitating the development of a more efficient and rapid super-resolution sequencing technique.
Innovation Solution
The method involves attaching a single DNA template molecule to each attachment element on a sample container with an average distance less than Abbe's limit, applying stochastic photo-switching chemistry to cause molecules to fluoresce in multiple colors, and imaging these events in real-time to achieve super-resolution sequencing without the need for synchronized reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DNA template molecules are positioned closer than Abbe's limit to increase sequencing density, then sequencing capacity and speed improve, but the ability to distinguish and image individual molecules deteriorates due to optical diffraction limits
Solution Approach 1:
The patent applies dynamic temporal control of fluorophore states, switching molecules between dark and fluorescent states stochastically over time. This temporal dimension allows super-resolution imaging of molecules spaced closer than Abbe's limit by capturing fluorescence events at different times rather than simultaneously in space
Solution Approach 2:
The invention transitions from spatial resolution (limited by Abbe's limit in the lateral plane) to temporal resolution by using time-resolved detection of stochastic fluorescence switching events. This adds a time dimension to the imaging process, enabling discrimination of closely spaced molecules that cannot be resolved spatially
2Reliability
If synchronized sequencing reactions are used to maintain phase coherence, then base calling accuracy improves, but phasing errors accumulate and reaction complexity increases
Solution Approach 1:
The patent employs self-correcting stochastic processes where individual molecules independently undergo fluorescence switching and nucleotide incorporation without external synchronization. The statistical properties of these independent events naturally produce resolvable signals, eliminating the need for complex synchronization mechanisms while maintaining base calling accuracy through probabilistic discrimination
3Productivity
If multiple fluorophores are imaged simultaneously to increase throughput, then sequencing efficiency improves, but signal overlap and cross-talk increase reducing measurement precision
Solution Approach 1:
The patent uses periodic stochastic switching of fluorophores between dark and fluorescent states, where each molecule flashes on and off at random intervals. This periodic action in time, combined with temporal gating during detection, allows simultaneous imaging of multiple fluorophores without cross-talk, as each molecule's signal is captured during its brief fluorescent windows separated by dark periods
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 allows for simultaneous imaging of multiple molecules, reducing the risk of phasing errors and enabling high-density cluster sequencing with reduced reagent costs and increased sequencing speed, while overcoming the diffraction barrier set by Abbe's limit.
Implementation Method 1
applying a stochastic photo-switching chemistry to all of the molecules at the same time to cause the attached molecules to fluoresce in on and off events in up to four different colors
Data Source
AI summary
An imaging system includes: a sample container including a flowcell that includes a plurality of attachment elements at a plurality of sample locations, wherein a single DNA template molecule is attached to each of the attachment elements, and further wherein an average distance between adjacent attachment elements is less than Abbe's limit; and an imager positioned to image photo-switching occurring at the plurality of attachment elements by capturing on and off events in a plurality of color channels at the same time as the on and off events are occurring for the attached molecules when a stochastic photo-switching chemistry is applied to all of the attached molecules at the same time causing the attached molecules to fluoresce in the on and off events in up to four different colors.