BKV Amplification Oligonucleotides for Low-Level Viral Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting and quantifying human polyomavirus BK virus (BKV) are not sensitive enough to accurately detect low levels of the virus in samples, particularly in immunosuppressed individuals, leading to potential complications such as BKV-associated nephropathy and other health issues in transplant patients.
Innovation Solution
The development of specific amplification oligonucleotides, including primers and probe oligonucleotides, that can amplify and detect BKV nucleic acids using various nucleic acid amplification methods, such as PCR and isothermal techniques, with modifications like 2′-O-methyl and 5-methylcytosine to enhance stability and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for BKV, then the detection process is simple, but the sensitivity is insufficient to accurately detect low levels of the virus
Solution Approach 1:
The detection method is divided into distinct functional components: specific amplification primers for targeted DNA amplification, probe oligonucleotides for specific detection, and modified nucleotides (2′-O-methyl and 5-methylcytosine) for enhanced stability. This segmentation allows each component to be optimized independently for sensitivity while maintaining overall method manageability
Solution Approach 2:
The patent employs composite nucleic acid structures incorporating both modified nucleotides (2′-O-methyl and 5-methylcytosine) within the same oligonucleotide molecule. This composite approach combines the stability benefits of chemical modifications with the specificity of sequence-based detection, achieving high sensitivity without proportionally increasing operational complexity
2Measurement precision
If standard PCR methods are used, then the procedure is straightforward, but the specificity is insufficient to distinguish BKV from similar viruses like JCV
Solution Approach 1:
The amplification primers and probe oligonucleotides are designed with highly specific local sequence characteristics that target unique regions of the BKV genome. The use of modified nucleotides at specific positions within the oligonucleotides further enhances local binding affinity and specificity, enabling discrimination between BKV and closely related viruses like JCV despite their 75% genomic sequence similarity
Solution Approach 2:
The patent employs chemical modification parameters of the nucleotides (2′-O-methyl and 5-methylcytosine) to alter the physical and chemical properties of the oligonucleotides. These parameter changes enhance binding specificity and stability, allowing the detection system to maintain high specificity even when targeting highly conserved viral sequences that are similar across different polyomaviruses
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 described methods provide sensitive and specific detection and quantification of BKV, allowing for early intervention in patients at risk, thereby reducing the incidence of complications like BKV-associated nephropathy.
Implementation Method 1
The methods involve the amplification of viral nucleic acid to detect the BKV target sequence in the sample. The nucleic acid amplification methods can use thermal cycling, or they can be isothermal. Nucleic acid amplification methods known in the art include, but are not limited to, polymerase chain reaction (PCR), reverse transcriptase PCR (RT-PCR), real time PCR, nucleic acid sequence-based amplification (NASBA), replicase-mediated amplification (including Qβ-replicase-mediated amplification), ligase chain reaction (LCR), and strand-displacement amplification (SDA).
Implementation Method 2
The amplification oligonucleotides further include probe oligonucleotides that facilitate detection of amplified sequence.
Data Source
AI summary
Oligomer nucleotides, compositions, methods, kits, and uses are provided for detecting or quantifying a human polyomavirus BK virus (BKV) nucleic acid, e.g., using nucleic acid amplification and hybridization assays.