Bst Polymerase Variants for Standalone RT-LAMP RNA Amplification
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Solution Overview
Problem
Existing Bst DNA polymerases (DNAPs) used in loop-mediated isothermal amplification (LAMP) assays have minimal reverse transcriptase (RT) activity, necessitating the use of additional RT enzymes for efficient RNA amplification, which increases cost and complexity.
Innovation Solution
Development of Bst polymerase variants with enhanced RT activity, such as WT-Δexo-Bst496, which includes mutations like P597R, A639T, D775Q, or M792I, allowing for standalone RNA amplification in LAMP assays without additional RT enzymes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional RT enzymes are used for RNA amplification in LAMP assays, then amplification sensitivity is improved, but assay complexity and cost increase
Solution Approach 1:
The patent combines the DNA polymerase activity and reverse transcriptase activity into a single Bst polymerase enzyme. The engineered Bst polymerase contains both the catalytic domain for DNA synthesis and the reverse transcriptase domain for RNA-to-DNA conversion, eliminating the need for separate RT enzyme addition and simplifying the assay protocol while maintaining amplification sensitivity
Solution Approach 2:
The Bst polymerase is engineered to perform multiple functions: it acts as both a DNA-dependent DNA polymerase for amplifying DNA templates and as an RNA-dependent DNA polymerase (reverse transcriptase) for converting RNA templates to DNA. This multi-functionality allows a single enzyme to handle both DNA and RNA amplification in LAMP assays
2Measurement precision
If additional RT enzymes are used for RNA amplification in LAMP assays, then amplification sensitivity is improved, but reagent cost increases
Solution Approach 1:
The patent combines the DNA polymerase activity and reverse transcriptase activity into a single Bst polymerase enzyme. The engineered Bst polymerase contains both the catalytic domain for DNA synthesis and the reverse transcriptase domain for RNA-to-DNA conversion, eliminating the need for separate RT enzyme addition and simplifying the assay protocol while maintaining amplification sensitivity
Solution Approach 2:
The Bst polymerase is engineered to perform multiple functions: it acts as both a DNA-dependent DNA polymerase for amplifying DNA templates and as an RNA-dependent DNA polymerase (reverse transcriptase) for converting RNA templates to DNA. This multi-functionality allows a single enzyme to handle both DNA and RNA amplification in LAMP assays
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 enhanced RT activity of Bst polymerase variants improves assay sensitivity and reduces costs by eliminating the need for supplemental RT enzymes, thereby improving the effectiveness of RNA and DNA sequence amplification in LAMP assays.
Implementation Method 1
Bst polymerases with enhanced reverse transcriptase (RT) activity for use in amplification assays
Implementation Method 2
Bst DNA polymerases (DNAPs) are commonly used for amplification of DNA sequences in a LAMP assay
Data Source
AI summary
Provided herein are compositions and methods for use in amplification assays. In particular, provided herein are Bst polymerases with enhanced reverse transcriptase (RT) activity for use in amplification assays such as, for example, loop-mediated isothermal amplification (LAMP) assays.