Hollow Bead Encapsulation for Multi-Assay Single-Cell Retention
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Solution Overview
Problem
Existing methods for performing multiple enzymatic reactions on a single cell are unreliable due to challenges in confining and accessing intracellular biomolecules, leading to loss of biomolecules during assays.
Innovation Solution
Encapsulating a single cell within a hollow bead with a polymer shell that allows diffusion of reagents while retaining the cell, enabling multiple co-assays such as lysis, DNA analysis, RNA analysis, and nucleic acid sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple enzymatic reactions are performed on a single cell without encapsulation, then assay complexity is reduced, but biomolecule loss occurs during assays
Solution Approach 1:
The system segments the assay process by encapsulating individual cells within separate droplets or microwells, isolating each cell in its own reaction compartment. This prevents biomolecule loss while maintaining assay simplicity through standardized parallel processing of multiple encapsulated cells
Solution Approach 2:
The droplet or microwell acts as an intermediary structure that confines the cell and reagents together, preventing biomolecule loss while allowing controlled access of enzymes and substrates. The intermediary compartment enables reliable multi-step enzymatic reactions without direct handling of free-floating cells
2Stability of the object's composition
If cells are confined within hollow beads for multiple co-assays, then cellular contiguity is maintained, but reagent diffusion through the polymer shell may be limited
Solution Approach 1:
The polymer shell is designed with controlled porosity that allows small molecule reagents, enzymes, and substrates to diffuse through while retaining the larger cell and biomolecules inside. This porous structure maintains cellular contiguity while ensuring adequate reagent accessibility for multiple co-assays
3Device complexity
If single cell sequencing is performed without spatial indexing, then data analysis is simpler, but genomic heterogeneity cannot be effectively studied
Solution Approach 1:
The system adds a spatial dimension to single cell sequencing by incorporating spatial indexes that record the physical location of each encapsulated cell. This enables genomic heterogeneity analysis through spatial mapping while keeping data analysis manageable through organized spatial indexing rather than complex computational deconvolution
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 method maintains cellular contiguity, allowing efficient performance of multiple assays on millions of cells while reducing sample preparation costs and maintaining sample integrity.
Implementation Method 1
the polymer shell includes pores that allow diffusion of a reagent through the polymer shell while retaining the single cell
Data Source
AI summary
Embodiments of systems, methods, and compositions provided herein relate to hollow beads encapsulating single cells. Some embodiments include performing multiple co-assays on a single cell encapsulated within a hollow bead, including nucleic acid sequencing, preparing nucleic acid libraries, determining methylation status, identifying genomic variants, or protein analysis.