Single-Cell Protein Quantification Using Oligonucleotide Barcodes
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Solution Overview
Problem
Current methods for quantitative analysis of proteins at the single-cell level, such as FACS, ELISA, and mass cytometry, are limited by sensitivity, sample throughput, and the number of markers that can be analyzed simultaneously, and require expensive and specialized heavy atom labeling.
Innovation Solution
Encoding the level of biological components, such as proteins, into oligonucleotide barcode sequences using libraries of binding elements like antibodies or aptamers, which are tagged with identifiable oligonucleotide barcodes, allowing for high-throughput sequencing of 10's to 10,000's of single cells simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional methods like FACS, ELISA, and mass cytometry are used for protein quantification, then measurement capability is achieved, but sensitivity, sample throughput, and the number of simultaneous markers analyzed are limited
Solution Approach 1:
The patent introduces oligonucleotide barcode sequences as intermediary carriers that link binding elements (antibodies/aptamers) to detectable signals. Each binding element is tagged with a unique oligonucleotide barcode, allowing high-throughput sequencing to quantify multiple proteins simultaneously without requiring complex specialized instrumentation like mass cytometry
Solution Approach 2:
The invention creates informational copies of protein presence/absence data by converting binding events into oligonucleotide barcode sequences that can be amplified and sequenced. This copying approach enables digital quantification where the number of barcode copies corresponds to the amount of target protein, dramatically increasing throughput compared to traditional single-cell methods
2Adaptability or versatility
If mass cytometry is used to analyze multiple markers, then the number of simultaneous markers increases, but expensive and specialized heavy atom labeling is required
Solution Approach 1:
The patent replaces expensive heavy atom labels with inexpensive oligonucleotide barcode sequences that can be synthesized using standard nucleic acid synthesis methods. These barcode tags are much cheaper to produce than heavy atom conjugates, enabling analysis of many more markers simultaneously without proportional increases in cost or labeling complexity
Solution Approach 2:
The oligonucleotide barcode system serves multiple functions: it identifies the specific binding element, quantifies the amount of bound target, and enables high-throughput sequencing compatibility. This universal approach allows the same platform to analyze dozens to hundreds of markers using standard molecular biology techniques rather than specialized heavy atom labeling protocols
3Measurement precision
If single-cell analysis is performed with traditional methods, then cellular resolution is achieved, but sensitivity and the number of markers per cell are limited
Solution Approach 1:
The patent adds a digital information dimension to single-cell protein analysis by encoding protein quantification data in oligonucleotide barcode sequences. This transforms analog protein amounts into digital countable units (number of barcode copies), enabling simultaneous measurement of many more markers per cell while maintaining single-cell resolution through high-throughput sequencing
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 quantitative analysis of proteins at single-cell resolution with high sensitivity and throughput, overcoming limitations of existing methods by allowing for parallel analysis of a large number of markers in a large number of cells.
Implementation Method 1
a library of at least about structurally distinct antibodies, wherein the structurally distinct antibodies have a specific binding affinity for, and are bound to, structurally distinct target epitopes of the fixed proteins
Implementation Method 2
The levels of the binding-element ligand complexes can be detected by recovering and sequencing the oligonucleotide barcodes bound to the binding elements
Data Source
AI summary
Methods and compositions are described for single cell resolution, quantitative proteomic analysis using high throughput sequencing.