Small Nucleic Acid Normalization via Degenerate Primer Amplification
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Solution Overview
Problem
Conventional methods for isolating small nucleic acid species, such as siRNA and miRNA, face challenges due to low abundance and cloning biases, limiting the identification and analysis of these molecules, which are crucial for understanding gene regulation and disease mechanisms.
Innovation Solution
The method involves ligating adapters to small nucleic acids, followed by amplification using primers with degenerate sequences to generate a normalized population, allowing for the identification of specific nucleic acid species through sequencing and cloning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional cloning methods are used to isolate small nucleic acid species, then the process is simple and widely applicable, but the representation of low-abundance species is biased and distorted
Solution Approach 1:
The patent applies preliminary action by performing adapter ligation to small nucleic acids before amplification. This preliminary step ensures that all species, including low-abundance ones, are tagged with adapters that enable their subsequent detection and normalization during PCR amplification, preventing their loss in conventional cloning processes.
Solution Approach 2:
The patent changes the parameter of primer concentration during PCR amplification by using formulated relative concentrations of primers. This parameter change enables normalization of the population, adjusting the representation of different small nucleic acid species so that low-abundance species are not lost in the amplification process.
2Ease of manufacture
If conventional cloning procedures are used, then the workflow is straightforward, but cloning biases cause overabundance of certain clones relative to others
Solution Approach 1:
The patent implements feedback by using degenerate sequences in primers that can adapt to different adapter sequences. This feedback mechanism ensures that the amplification process accounts for variations in the starting population, adjusting primer binding to normalize the representation of different clones and prevent bias toward certain sequences.
Solution Approach 2:
The patent applies parameter changes by formulating relative concentrations of primers based on the expected abundance of different small nucleic acid species. This allows the amplification process to compensate for initial biases and achieve a normalized population where each species is represented proportionally.
3Ease of manufacture
If conventional isolation methods are used, then the process is simple, but the identification limit is reached for certain species like miRNA
Solution Approach 1:
The patent applies preliminary action by ligating adapters to small nucleic acids before amplification. This step is crucial for species like miRNA that are difficult to isolate, as the adapter ligation enables subsequent PCR amplification and sequencing, pushing the identification limit beyond what conventional methods can achieve.
Solution Approach 2:
The patent uses adapters as intermediaries between the small nucleic acids and the amplification/sequencing process. These adapters facilitate the detection and identification of low-abundance species by providing a universal binding site that enables their incorporation into the amplification workflow, overcoming the limitations of direct conventional isolation methods.
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 enables the normalization of small nucleic acid populations, overcoming the limitations of conventional cloning methods by enhancing the representation of low-abundance species and facilitating their identification and analysis.
Implementation Method 1
ligating adapters to one or both ends of at least some of the small nucleic acids to form a multiplicity of adapter-modified molecules
Implementation Method 2
amplifying the multiplicity of adapter-modified molecules with a multiplicity of primers to generate extension products
Data Source
AI summary
The present teachings are generally directed to methods for normalizing at least one species of small nucleic acid that is present in a population of small nucleic acid species, wherein the relative concentration of at least one small nucleic acid species is substantially greater than the relative concentration of at least one other small nucleic acid species in the population. At least one small nucleic acid species is normalized using a multiplicity of primers comprising degenerate sequences. In some embodiments, a small nucleic acid species is identified by inserting at least part of an extension product from a normalized population into a vector and subsequently sequencing the insert. In some embodiments, a small nucleic acid species is identified by determining the sequence of at least part of an extension product.