Reverse Transcriptase Additives for Inhibitor Tolerance
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Solution Overview
Problem
Existing methods for reverse transcriptase (RT) activity face challenges in enhancing RT efficiency and reducing inhibition by substances like heparin, formalin, and tannic acid.
Innovation Solution
The use of specific additives such as potassium glutamate, histidine hydrochloride monohydrate, poloxamer 188, and salts of polyvinyl sulfonic acid (PVSA) in the presence of oligonucleotide primers with randomized sequences to enhance RT activity and reduce inhibitor effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reverse transcriptase reactions are performed without additives, then the reaction is simple and quick, but RT activity is inhibited by substances like heparin, formalin, and tannic acid
Solution Approach 1:
The patent introduces specific additives (potassium glutamate, histidine hydrochloride monohydrate, poloxamer 188, and PVSA salts) as intermediary substances that mediate between the RT enzyme and inhibitors. These additives bind to or interact with inhibitory substances like heparin, formalin, and tannic acid, preventing them from directly inhibiting RT activity, thus resolving the contradiction between maintaining simple reaction conditions and ensuring reliable RT activity in the presence of inhibitors
Solution Approach 2:
The patent modifies the chemical parameters of the reaction system by introducing additives that change the ionic strength, pH, or molecular environment of the reaction mixture. For example, potassium glutamate and histidine hydrochloride monohydrate alter the ionic composition, while poloxamer 188 and PVSA salts modify the molecular interactions, thereby changing the reaction parameters to reduce inhibitor binding affinity and enhance RT activity stability
2Productivity
If additives are added to enhance RT activity and reduce inhibition, then RT efficiency and inhibitor tolerance improve, but the reaction mixture becomes more complex
Solution Approach 1:
The patent applies local quality by introducing additives that specifically target particular inhibitory substances or reaction conditions. Instead of making the entire reaction mixture complex, only specific components (additives) are added to address specific problems (inhibitor binding). Each additive has a specific function: potassium glutamate for heparin inhibition, histidine hydrochloride monohydrate for formalin inhibition, poloxamer 188 for tannic acid inhibition, and PVSA salts for general RT activity enhancement, thereby improving productivity without uniformly increasing complexity throughout the system
3Adaptability or versatility
If randomized primers with high and low GC content are used, then synthesis of cDNA from RNA templates with high and low GC content is enhanced, but the primer mixture becomes more complex
Solution Approach 1:
The patent creates universal primers by combining randomized primers with high GC content and low GC content in a single mixture. This multi-functional primer mix can adapt to bind and prime synthesis for RNA templates with varying GC compositions. The high GC content primers effectively prime for GC-rich regions while low GC content primers handle AT-rich regions, making the primer system universally applicable across diverse template types without requiring separate primer sets for different GC content scenarios
Data Source
AI summary
The subject application pertains to compositions and methods for enhancing reverse transcriptase (RT) activity and/or reducing the inhibition of RT by inhibitors, such as formalin, tannic acid and/or heparin. In some embodiments, RT inhibition is reduced by the addition of potassium glutamate, histidine hydrochloride monohydrate, poloxamer 188, or any combination thereof to a reaction mixture comprising a polymerase. In other embodiments, RT is enhanced through the addition of a polyvinyl sulfonic acid sodium salt (PVSA) to a reaction mixture. The subject application also provides oligonucleotide primers for use in the reverse transcription of target sequences and its enhancement. These primers have high GC content or low GC content. Methods of using a RT inhibition reducer or a RT enhancer in a composition with an RNA template and RT improves RT yield, RT sensitivity, or RT tolerance to various chemicals are also provided.