Single-Base Primer Extension Sequencing via Labeled Terminators
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Solution Overview
Problem
Current nucleic acid sequencing methods are limited in determining contiguous sequences of nucleotides efficiently, particularly for applications in research and diagnostics, as they often require complex processes and materials that are not fully effective in sequencing long or complex DNA sequences.
Innovation Solution
A method using single-base primer extension with labeled dideoxynucleotide terminators immobilized on solid supports, such as microspheres or two-dimensional arrays, allows for the identification of contiguous sequences by detecting the incorporated terminators, enabling the determination of at least four contiguous bases of a target nucleic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nucleic acid sequencing methods are used, then sequencing can be performed, but the process is complex and not fully effective for long or complex DNA sequences
Solution Approach 1:
The sequencing process is divided into discrete, manageable steps: primer annealing to the template, single-base extension with labeled dideoxynucleotides, and detection of incorporated terminators. This segmentation allows each step to be optimized independently and simplifies the overall process compared to conventional sequencing methods.
Solution Approach 2:
Labeled dideoxynucleotide terminators serve as intermediaries that carry detectable labels (such as fluorophores) to mark the position of incorporated bases. These intermediaries enable the detection mechanism to identify sequence information without requiring complex analysis of the entire DNA molecule.
2Productivity
If single-base primer extension with labeled dideoxynucleotide terminators is used, then sequencing speed and accuracy are improved, but the method requires immobilization of primers to solid supports
Solution Approach 1:
The solid support system performs multiple functions automatically: it immobilizes primers in place, provides a stable platform for the extension reaction, and enables detection of incorporated terminators through the solid support matrix. This self-service approach eliminates the need for separate immobilization steps and simplifies the overall system.
Solution Approach 2:
The solid support structure serves multiple purposes simultaneously: it acts as a primer anchor, a reaction substrate, and a detection platform. This multi-functionality reduces the number of separate components needed and simplifies the sequencing system while maintaining high productivity.
3Productivity
If multiple primers are combined in reaction mixtures, then contiguous sequences can be determined more efficiently, but the complexity of managing multiple primer combinations increases
Solution Approach 1:
Multiple primers targeting different positions in the template are combined into single reaction mixtures that can be processed simultaneously on the solid support. This merging of reactions increases productivity by determining multiple contiguous sequences in parallel while the solid support system manages the complexity through its structured immobilization platform.
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 method provides a robust and efficient means to sequence nucleic acids, capable of determining sequences of varying lengths, from 4 to 500 bases, enhancing research and diagnostic capabilities by improving sequencing speed and accuracy.
Implementation Method 1
extending the one or more primers from step (a) with a polymerase in the presence of one or more labeled dideoxynucleotides
Implementation Method 2
the label of each microsphere is optically-detected, based upon varying concentrations of at least two dyes
Implementation Method 3
the primers anneal to the target nucleic acid
Data Source
AI summary
The present invention pertains to a method for determining a sequence of contiguous bases within a polynucleotide, the method relying on single-base primer extension using labeled dideoxynucleotide terminators. The primers are immobilized to solid supports (e.g. microspheres or two-dimensional arrays), allowing for the identification of the labeled terminator incorporated into each primer.