Cell Bead Encapsulation for Single-Cell Nucleic Acid Epigenetic Characterization
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Solution Overview
Problem
Current methods lack efficient means to characterize nucleic acid molecules from individual cells, particularly for determining epigenetic states, due to limitations in sample processing that fail to account for cell-to-cell variations and require large sample amounts.
Innovation Solution
A method involving cell beads that encapsulate nucleic acid molecules, allowing for partitioning and processing within microfluidic partitions to synthesize barcoded nucleic acid molecules, which are then used to identify epigenetic features and determine the epigenetic state of individual cells through barcoding and sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sample processing methods are used to characterize nucleic acid molecules, then sufficient sample quantity is required for analysis, but this prevents analysis of individual cells and fails to account for cell-to-cell variations
Solution Approach 1:
The invention partitions a population of cells into individual partitions (droplets or wells), with each partition containing at most one cell. This segmentation enables independent processing and characterization of each cell's nucleic acid molecules, achieving single-cell level precision while requiring minimal total sample quantity.
Solution Approach 2:
The invention introduces cell beads as intermediaries that encapsulate individual cells and their nucleic acid molecules. These cell beads serve as carriers that enable the transition from bulk sample processing to single-cell analysis, allowing precise characterization of individual cells without requiring large sample quantities.
2Loss of information
If bulk sample processing is used, then processing is simpler, but cell-to-cell variations cannot be detected
Solution Approach 1:
By dividing the sample into individual cell partitions, the invention preserves cell-to-cell variation information that would be lost in bulk processing. Each partition maintains the unique molecular signature of its parent cell, enabling detection of heterogeneity within the cell population.
Solution Approach 2:
The invention applies different processing conditions to different partitions based on their local requirements. Each partition can be independently optimized for its specific cell type and nucleic acid content, allowing tailored analysis that preserves local variations while maintaining overall processability.
3Measurement precision
If individual cells are processed separately, then cell-to-cell variations can be detected, but processing complexity increases
Solution Approach 1:
The invention employs universal cell beads that can encapsulate any cell type and serve multiple functions: physical isolation, nucleic acid protection, and reaction vessel. This multi-functionality reduces the need for cell-type-specific processing protocols, thereby reducing overall system complexity despite individual cell analysis.
Solution Approach 2:
The cell beads are designed to self-assemble around individual cells through spontaneous emulsification or droplet formation. This self-service mechanism eliminates the need for complex manual partitioning equipment, reducing device complexity while maintaining single-cell analysis precision.
4Quantity of substance
If large sample quantities are used for analysis, then sufficient material is available for processing, but individual cell characteristics are lost
Solution Approach 1:
The invention segments the nucleic acid material into individual cell-associated portions, each contained within separate partitions. This segmentation ensures that sufficient material is available from each individual cell for complete epigenetic characterization, while preventing the averaging effect that occurs in bulk processing.
Solution Approach 2:
Cell beads act as intermediaries that concentrate and preserve the nucleic acid material from individual cells. Each cell bead captures and retains the complete epigenetic information of its parent cell, making this information available for downstream analysis without requiring pooling of multiple cells.
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
Enables precise characterization of nucleic acid molecules at the single-cell level, assessing epigenetic features like methylation and chromatin accessibility, overcoming previous limitations by allowing for detailed analysis of individual cell variations without the need for large sample quantities.
Implementation Method 1
providing a cell bead comprising the nucleic acid molecule from the single cell
Implementation Method 2
partitioning the cell bead in a single partition among a plurality of partitions
Implementation Method 3
synthesizing a barcoded nucleic acid molecule from the nucleic acid molecule, which barcoded nucleic acid molecule comprises a cell barcode
Implementation Method 4
processing the barcoded nucleic acid molecule or a derivative thereof to identify the one or more epigenetic features and the cell barcode
Data Source
AI summary
Provided herein are methods and systems for characterizing a nucleic acid molecule from a single cell. A method for characterizing a nucleic acid molecule from a single cell may comprise providing a partition (e.g., droplets or wells) comprising a single cell and a single bead. The single bead may comprise a nucleic acid barcode molecule. A nucleic acid molecule from the single cell and the nucleic acid barcode molecule may be used to generate a barcoded nucleic acid molecule for sequencing, which may be used to determine an epigenetic state or characteristic of the nucleic acid molecule as being associated with the single cell.