Nucleic Acid Barcode Decoding via Rolling Circle Amplification
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Solution Overview
Problem
Current pooled genetic screens are inadequate for robust, high-throughput, and flexible screening of factors regulating in situ phenotypes, such as cell size, shape, and chromatin organization, which are crucial for understanding cellular behavior and disease mechanisms.
Innovation Solution
A method involving nucleic acid barcodes that utilize rolling circle amplification and labeled readout probes for decoding, allowing for the identification of genetic perturbations affecting in situ phenotypes by amplifying target regions and hybridizing with complementary probes for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pooled genetic screens are used, then growth or gene expression phenotypes can be screened, but robust high-throughput screening of in situ phenotypes (cell size, shape, chromatin organization) cannot be achieved
Solution Approach 1:
The barcode is divided into multiple segments, each containing a target region that can be independently amplified and detected. This segmentation allows parallel processing of multiple barcode regions, enabling high-throughput screening while maintaining the ability to detect diverse in situ phenotypes through different readout probes
Solution Approach 2:
Rolling circle amplification serves as an intermediary step between the original barcode and the detection system. The amplification generates multiple copies of barcode segments with high specificity, enabling robust detection of in situ phenotypes while maintaining the ability to screen large numbers of samples simultaneously
2Adaptability or versatility
If barcode amplification and detection methods are developed for in situ phenotypes, then screening capability is improved, but method complexity increases
Solution Approach 1:
The rolling circle amplification system is designed to be universal, working with multiple barcode segment designs and compatible with various detection methods (fluorescence, sequencing). The padlock probe and readout probe system can detect different in situ phenotypes using the same core amplification methodology, reducing overall system complexity despite the enhanced screening capability
Solution Approach 2:
The barcode segments are pre-designed with specific target regions that are optimized for rolling circle amplification. This preliminary design of the barcode structure with defined target regions simplifies the detection process by ensuring high-specificity amplification occurs efficiently, reducing the complexity of optimizing detection conditions
3Measurement precision
If rolling circle amplification is used to amplify barcode segments, then detection accuracy is improved, but time and resource consumption increase
Solution Approach 1:
The rolling circle amplification process uses periodic action through repeated cycles of primer annealing and extension. This periodic amplification generates multiple copies of barcode segments systematically, improving detection accuracy through accumulated signal while the standardized cycle format allows for efficient time management and optimization
Solution Approach 2:
Rolling circle amplification creates multiple identical copies of the barcode target region. This copying process amplifies the signal from limited starting material, improving detection accuracy by generating sufficient signal for robust detection while the in situ nature of the assay minimizes additional time requirements
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 accurate and efficient decoding of nucleic acid barcodes, facilitating the identification of genetic regulators of in situ phenotypes, thereby enhancing the capability for high-throughput genetic screening and understanding of cellular behavior and disease mechanisms.
Implementation Method 1
amplifying at least a target region of a segment of the nucleic acid barcode by rolling circle amplification to generate amplified nucleic acids comprising copies of the segment target region
Implementation Method 2
contacting the sample with one or more labeled readout probes under conditions that allow hybridization of said labeled readout probes to said amplified nucleic acids, wherein each said labeled readout probe comprises a sequence complementary to a sequence in said amplified nucleic acids
Data Source
AI summary
Provided herein are methods for decoding nucleic acid barcodes in situ by using rolling circle amplification and labeled probes. Also provided herein are methods of performing an in situ genetic screen, using the nucleic acid barcode decoding techniques described herein.