Single-Cell Nucleic Acid Linking via Emulsion PCR
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Solution Overview
Problem
Current methods for analyzing nucleic acid molecules in cells are cumbersome and inefficient, particularly when these molecules act together in cells, as they require expensive equipment, are time-consuming, and do not provide a comprehensive understanding of the immune status of an organism.
Innovation Solution
A method for linking at least two target nucleic acid molecules from a single biological subcellular compartment involves isolating a fraction, diluting it, and aliquoting it into separate reaction vessels or encapsulating it in emulsion droplets, followed by linking the molecules using techniques like PCR, site-specific recombination, or ligation, allowing for subsequent sequencing and functional analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (FACS sorting, cell picking) are used to analyze nucleic acid molecules in single cells, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The invention extracts and analyzes specific nucleic acid molecules (VH and VL genes) directly from bulk cell populations without extracting or isolating individual cells. This is achieved through selective amplification using primers that specifically bind to VH and VL gene sequences, allowing the target molecules to be separated and analyzed from the complex cellular environment without requiring FACS sorting or cell picking equipment.
Solution Approach 2:
The method provides a universal approach that can analyze multiple types of nucleic acid variations (SNPs, splice variants, variable regions) simultaneously in a single reaction system. The same basic protocol can be applied to different gene targets and cell types without requiring specialized equipment for each application, making the method broadly applicable across different research and diagnostic needs.
2Measurement precision
If conventional methods (FACS sorting, cell picking) are used to analyze nucleic acid molecules in single cells, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The invention segments the analysis process by using specific primer sets that target VH and VL genes separately, allowing these gene segments to be amplified and analyzed independently from other cellular components. This segmentation enables direct analysis of antibody gene combinations without the time-consuming process of isolating individual cells first, as the specific gene segments can be identified and characterized directly from the bulk population.
Solution Approach 2:
The method performs preliminary selective amplification of VH and VL genes using specific primers before further analysis. This preliminary action enriches the target nucleic acid molecules of interest directly from the bulk cell population, eliminating the need for subsequent time-consuming cell isolation steps while maintaining the ability to analyze single-cell derived gene combinations.
3Ease of operation
If bulk nucleic acids are isolated from cell populations, then ease of operation is improved, but loss of information increases
Solution Approach 1:
The invention uses feedback through selective primer binding and amplification to identify and characterize specific VH-VL gene combinations present in the bulk nucleic acid preparation. The amplification products are then analyzed (e.g., by sequencing) to determine which specific antibody gene variants are present, providing feedback information about the nucleic acid variant combinations without requiring individual cell analysis. This allows the simple bulk isolation approach to yield specific combination information.
Solution Approach 2:
The method replaces the mechanical approach of physically isolating individual cells with a molecular-based approach using selective PCR amplification. Instead of mechanically separating cells and then analyzing their nucleic acids, the invention uses biochemical specificity of primers to selectively amplify and identify the nucleic acid variants of interest directly from the bulk population, substituting a chemical/molecular mechanism for a mechanical one.
Data Source
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AI summary
The invention relates to a method for linking at least two target nucleic acid molecules from a single biological compartment, comprising the steps of isolating a fraction from a sample, wherein the fraction comprises the compartment comprising at least two nucleic acid molecules; diluting said fraction and aliquoting the dilution in multiple separate reaction vessels such that each reaction vessel comprises preferably one compartment, or encapsulating said compartment in emulsion droplets such that each droplet comprises preferably one compartment; linking said at least two target nucleic acid molecules, preferably by overlap extension PCR. The method may be employed in the analysis of mutations present in a single cell and in the production of antibodies which are present in a single hybridoma.