Microfluidic Epigenetic Sequencing via Cell-Specific Barcode Ligation
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Solution Overview
Problem
Current methods for studying epigenetics require large populations of cells, making it difficult to analyze epigenetic differences at the single-cell level, which is crucial for understanding complex tissues like tumors and has limited clinical applications.
Innovation Solution
A method involving microfluidics where cells are lysed and their DNA is labeled with adapters containing identification sequences, allowing for the separation and sequencing of DNA from individual cells, enabling epigenetic analysis at the single-cell level by combining cells and using unique barcodes to distinguish between cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional epigenetic sequencing methods are used, then sufficient DNA material is available for analysis, but only population-level data is obtained without single-cell resolution
Solution Approach 1:
The patent segments the DNA analysis process by first fragmenting genomic DNA into smaller fragments, then tagging each fragment with cell-specific barcodes during adapter ligation. This segmentation allows individual cell DNA to be distinguished and analyzed separately while maintaining sufficient material through pooling of many tagged fragments.
Solution Approach 2:
The patent creates multiple copies of cell-specific barcode information by ligating adapters containing unique identification sequences to DNA fragments from individual cells. These barcode copies enable tracking and identification of DNA origin from single cells even after pooling and amplification.
2Measurement precision
If large populations of cells are analyzed, then sufficient statistical power is obtained, but heterogeneity among individual cells is lost
Solution Approach 1:
The method segments cellular analysis by assigning unique barcodes to DNA fragments from individual cells, enabling simultaneous analysis of many cells while preserving individual cell identity. This allows heterogeneity detection across large cell populations without requiring separate analysis of each cell.
Solution Approach 2:
The patent merges DNA fragments from multiple individual cells into a single pooled library after barcode tagging. This combining approach maintains the ability to trace each fragment to its cell of origin through barcodes while enabling high-throughput analysis of large cell populations in parallel.
3Measurement precision
If single-cell epigenetic profiling is performed, then cellular heterogeneity is resolved, but the complexity of the protocol increases
Solution Approach 1:
The patent employs universal adapter sequences that can be ligated to DNA fragments from any cell type, with cell-specific information encoded in variable barcode regions. This universal approach simplifies the protocol by using the same basic ligation and sequencing workflow for all samples while still achieving single-cell resolution.
Solution Approach 2:
The patent introduces barcode-containing adapters as intermediary molecules that bridge individual cell DNA and the sequencing platform. These adapters serve as mediators that carry cell-specific identification information through the complex processing steps, simplifying the overall protocol by providing a standardized interface between single-cell samples and high-throughput sequencing.
Data Source
AI summary
The present invention generally relates to microfluidics and/or epigenetic sequencing. In one set of embodiments, cells contained within a plurality of microfluidic droplets are lysed and the DNA (e.g., from nucleosomes) within the droplets are labeled, e.g., with adapters containing an identification sequence. The adapters may also contain other sequences, e.g., restriction sites, primer sites, etc., to assist with later analysis. After labeling with adapters, the DNA from the different cells may be combined and analyzed, e.g., to determine epigenetic information about the cells. For example, the DNA may be separated on the basis of certain modifications (e.g., methylation), and the DNA from the separated nucleosomes may be sequenced using techniques such as chromatin immunoprecipitation (“CUP”). In some cases, the DNA sequences may also be aligned with genomes, e.g., to determine which portions of the genome were epigenetically modified, e.g., via methylation.