DNA Probe Chip Room-Temperature Hybridization Design
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Solution Overview
Problem
Conventional DNA chips require high-temperature hybridization to achieve specificity, which leads to issues like solvent evaporation, reduced DNA bonding, and increased nonspecific binding, hindering precise genotyping.
Innovation Solution
Designing DNA probes with consecutive guanine bases that can hybridize at room temperature (20° C. – 30° C.), minimizing nonspecific binding and enhancing sensitivity and specificity, and immobilizing these probes on a DNA chip for efficient genotyping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature hybridization is used to achieve specificity, then specificity is improved, but solvent evaporation occurs and nonspecific binding increases
Solution Approach 1:
The patent changes the temperature parameter from high-temperature hybridization to room-temperature hybridization. By designing probes with specific sequences (starting at positions -10 to +5 relative to the 3'-terminal of the primer) and using calixarene derivatives as substrates, the system achieves high specificity without requiring elevated temperatures, thereby eliminating solvent evaporation and reducing nonspecific binding issues associated with high-temperature processing.
2Reliability
If high-temperature hybridization is used to minimize nonspecific binding, then specificity is improved, but DNA bonding is reduced
Solution Approach 1:
The patent changes the operating temperature parameter from high temperature to room temperature, which preserves DNA bonding efficiency while maintaining specificity through carefully designed probe sequences. The probe design specifications (starting positions -10 to +5 relative to primer 3'-terminal) ensure that hybridization occurs specifically at room temperature without the need for thermal denaturation and reannealing cycles that can reduce DNA bonding.
3Object-affected harmful factors
If room temperature hybridization is used, then solvent evaporation and nonspecific binding are reduced, but specificity may be compromised
Solution Approach 1:
The patent applies local quality by designing probes with specific local sequence characteristics (starting at positions -10 to +5 relative to the 3'-terminal of the primer) that confer temperature-independent specificity. Additionally, the use of calixarene derivatives as substrates provides a localized chemical environment that enhances specific binding at room temperature through molecular recognition, compensating for the generally lower stringency of room-temperature hybridization.
Solution Approach 2:
The patent employs composite materials by combining calixarene derivatives with specifically designed DNA probe sequences. This composite system leverages the molecular recognition properties of calixarenes and the sequence-specific binding of DNA probes to achieve high specificity at room temperature, overcoming the typical limitation that room-temperature hybridization lacks the stringency of high-temperature processing.
4Temperature
If conventional probe design is used for high-temperature hybridization, then high-temperature processing is effective, but sensitivity and signal intensity are reduced
Solution Approach 1:
The patent changes the hybridization temperature parameter from high temperature to room temperature, which directly improves sensitivity and signal intensity by preventing DNA degradation and maintaining probe stability. The redesigned probe sequences (starting at positions -10 to +5 relative to primer 3'-terminal) are optimized for room-temperature binding, ensuring that the lower thermal energy environment produces stronger, more stable hybridization signals without requiring high-temperature processing.
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
The DNA chip achieves high specificity and sensitivity at room temperature, reducing nonspecific binding and allowing for precise genotyping with improved signal intensity and reduced solvent issues.
Implementation Method 1
Designing DNA probes with consecutive guanine bases that can hybridize at room temperature (20° C. – 30° C.)
Implementation Method 2
The present application is based on, and claims priority from, Korean Patent Application No. 2007-0117736, filed Nov. 19, 2007, and Korean Patent Application No. 2008-0093800, filed Sep. 24, 2008, the disclosure of which is hereby incorporated by reference herein in its entirety. FIG. 1A and FIG. 1B are diagrams showing the process of preparing a glass slide spread with a monolayer of an aminocalixarene derivative or a monolayer of an iminecalixarene derivative, which recognizes consecutive guanine bases.
Data Source
AI summary
The present invention relates to a method of designing DNA probe chip for room-temperature hybridization in order to solve the solvent evaporation problem occurring when carrying out said hybridization at a high temperature of 40° C.˜50° C. or higher, wherein the method is designed to allow genotyping through hybridizing at a room temperature of 20° C.˜30° C. The method of designing DNA probe chip comprises designing DNA probe to start at −10˜+5 position that is between −10 position which is overlapped 10 sequences with primer and +5 position which is 5 sequences far from the 3′-terminal of primer, based on 0 position which is 3′-terminal of primer.