Polar Aprotic Solvents for Low-Temperature Nucleic Acid Hybridization
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Solution Overview
Problem
Traditional hybridization methods require high temperatures and formamide, which can damage nucleic acids, cause evaporation issues, and are toxic, leading to prolonged processing times and morphological destruction of samples.
Innovation Solution
The use of aqueous compositions containing polar aprotic solvents at effective concentrations to denature double-stranded nucleic acids at lower temperatures or without denaturation, reducing the need for formamide and simplifying the hybridization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperatures (95°C to 100°C) are used for denaturation, then double-stranded nucleic acid can be separated, but phosphodiester bonds may be broken and evaporation of aqueous buffers becomes difficult to control
Solution Approach 1:
The patent changes the chemical composition parameter by introducing polar aprotic solvents (such as dimethyl sulfoxide, dimethylformamide, or acetonitrile) into the hybridization solution. This parameter change allows denaturation to occur at lower temperatures (below 95°C) while maintaining effective hybridization, thereby preventing phosphodiester bond breakage and buffer evaporation issues associated with high temperature treatment.
2Temperature
If formamide-containing solutions are used to denature at lower temperatures, then denaturation can occur at lower temperatures, but renaturation time is significantly prolonged
Solution Approach 1:
The patent changes the solvent type parameter by using polar aprotic solvents instead of formamide. This parameter change achieves two objectives: it enables lower temperature denaturation (improving the temperature parameter) and maintains normal renaturation kinetics (preventing the time extension problem). The polar aprotic solvents disrupt base pairing effectively at lower temperatures without interfering with subsequent renaturation processes.
3Temperature
If formamide is used for denaturation, then denaturation can occur at lower temperatures, but toxic and hazardous material issues arise and cellular structure may be destroyed
Solution Approach 1:
The patent replaces formamide (a toxic, hazardous material requiring strict regulations) with polar aprotic solvents that are less toxic and easier to handle. This substitution maintains the functional benefit of lower temperature denaturation while eliminating the harmful effects. The polar aprotic solvents achieve denaturation without causing morphological destruction of cellular, nuclear, or chromosomal structures.
4Reliability
If traditional hybridization methods are used, then probes can bind to target nucleic acid, but aggressive conditions are required and processing time is prolonged
Solution Approach 1:
The patent changes the chemical environment parameter by using polar aprotic solvents in the hybridization solution. This parameter change creates optimal conditions for both denaturation and hybridization to occur efficiently at lower temperatures. The result is a streamlined process that maintains reliable probe-target binding while significantly reducing total processing time by eliminating the need for separate high-temperature denaturation and extended renaturation steps.
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 reduces denaturation temperatures, minimizes sample damage, decreases processing time, and eliminates the toxicity and evaporation issues associated with formamide, while maintaining signal intensity and reducing background noise.
Implementation Method 1
This polar aprotic solvent disrupts base pairing by displacing loosely and uniformly bound hydrate molecules and by causing 'formamidation' of the Watson-Crick binding sites. Thus, formamide has a destabilizing effect on double stranded nucleic acids and analogs
Implementation Method 2
Double stranded nucleic acid molecules (i.e., DNA (deoxyribonucleic acid), DNA/RNA (ribonucleic acid) and RNA/RNA) associate in a double helical configuration. This double helix structure is stabilized by hydrogen bonding between bases on opposite strands when bases are paired in one particular way (A+T/U or G+C) and hydrophobic bonding among the stacked bases
Data Source
AI summary
The invention provides methods and compositions for hybridizing at least one molecule to a target. The invention may, for example, eliminate the use of, or reduce the dependence on formamide in hybridization. Compositions for use in the invention include an aqueous composition comprising at least one nucleic acid sequence and at least one polar aprotic solvent in an amount effective to denature double-stranded nucleotide sequences.