High-Throughput Genetic Screening via Cell Sorting
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Solution Overview
Problem
Current genetic screens face challenges in identifying relevant genetic elements affecting intracellular phenotypes due to high levels of noise, leading to laborious experimentation and the miss detection of less strong but relevant signals, particularly in mutagenesis-based genetics and eukaryotic systems.
Innovation Solution
A high-throughput method involving mutagenesis treatment, fixation, permeabilization, and sorting of cells using detectable probes to identify genetic elements affecting intracellular phenotypes, followed by sequencing to pinpoint genetic and cellular elements involved in the phenotype, reducing noise and facilitating straightforward identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional genetic screens are used to identify genetic elements affecting intracellular phenotypes, then the screening process can detect potential hits, but high levels of noise lead to laborious follow-up studies and miss detection of weaker relevant signals
Solution Approach 1:
The patent applies preliminary action by performing mutagenesis treatment on a population of cells before conducting the genetic screen. This pre-mutagenesis step creates a diverse genetic library in advance, allowing the subsequent screen to directly identify relevant genetic elements without requiring extensive follow-up mutagenesis experiments for each potential hit. The preliminary creation of mutant pools streamlines the overall process and reduces time loss.
Solution Approach 2:
The patent uses copying by creating multiple copies of mutant cells with different genetic modifications and screening them in parallel. Instead of sequentially testing each mutant, the method generates a large population of mutant cells, each carrying different mutations, and screens them simultaneously using flow cytometry. This parallel copying approach amplifies the detection signal and reduces the need for repetitive follow-up studies.
2Productivity
If traditional genetic screens are used, then potential hits can be identified, but high noise levels result in many false positives requiring laborious confirmation
Solution Approach 1:
The patent replaces mechanical/manual verification methods with automated flow cytometry-based detection. Instead of laborious manual confirmation of each potential hit, the system uses fluorescently labeled probes and automated cell sorting to objectively detect and quantify phenotypic changes. This substitution of automated detection for manual verification improves both productivity and reliability by reducing human error and providing quantitative, reproducible data.
Solution Approach 2:
The patent implements feedback by using flow cytometry to immediately detect and quantify phenotypic changes in mutant cells during the screening process. The automated detection system provides real-time feedback on which cells exhibit the desired phenotype, allowing for immediate identification of true positives. This feedback mechanism distinguishes true hits from false positives more effectively than traditional methods, improving the reliability of hit identification.
3Adaptability or versatility
If intracellular phenotypes are detected using traditional methods, then the detection process becomes complex and requires access to viable mutant organisms, but this limits the types of phenotypes that can be studied
Solution Approach 1:
The patent applies universality by developing a detection method using flow cytometry that can detect multiple different intracellular phenotypes through the use of various fluorescently labeled probes. The same basic platform (flow cytometry) can be adapted to detect different proteins, DNA modifications, or cellular states by simply changing the probe targets. This multi-functional approach expands the range of detectable phenotypes without proportionally increasing system complexity.
Solution Approach 2:
The patent uses fluorescently labeled probes as intermediaries to detect intracellular phenotypes. These probes act as mediators that bind to specific intracellular targets (proteins, DNA, RNA) and convert intracellular molecular events into detectable optical signals. This intermediary approach simplifies the detection process by translating complex intracellular phenomena into measurable fluorescence signals that can be analyzed by flow cytometry, making the system more versatile while managing complexity.
4Measurement precision
If large populations of modified cells are screened, then statistical power increases, but the complexity of analyzing heterogeneous populations increases
Solution Approach 1:
The patent replaces complex manual analysis of heterogeneous cell populations with automated flow cytometry and computational analysis. The flow cytometer automatically measures fluorescence parameters for thousands of individual cells, and software algorithms process the data to identify patterns and significant hits. This substitution of automated measurement and analysis for manual examination maintains statistical power from large population screening while managing the complexity of analyzing heterogeneous populations.
Solution Approach 2:
The patent uses color changes (fluorescence intensity variations) to distinguish different cell populations and phenotypic states within the heterogeneous population. By labeling cells with fluorescent probes that change intensity or color based on the presence or absence of specific genetic modifications or phenotypic states, the system translates complex population heterogeneity into distinguishable optical signals. This allows automated detection and analysis of multiple cell types and states simultaneously, managing population complexity while maintaining statistical power.
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
This method allows for reliable and efficient identification of genetic and cellular elements affecting intracellular phenotypes, reducing noise and laborious confirmation studies, and is suitable for eukaryotic cells, including those with disease-causing mutations, enabling the analysis of biological pathways and drug interactions.
Implementation Method 1
a pool of cells is subjected to a mutagenesis treatment
Implementation Method 2
the pool of cells is subjected to fixation and permeabilization
Implementation Method 3
the pool of cells is subjected to fixation and permeabilization
Implementation Method 4
sorted based on the phenotype under study
Data Source
Figure 1A~1B
Figure 1C
Figure 1D
AI summary
The present invention comprises generally applicable methods for identifying endogenous physiologically relevant genetic elements that affects a intracellular phenotype of interest. In the methods, non-living cells that have been subjected to a mutagenesis treatment are sorted based on phenotype and analyzed to identify the genetic element. By use of these methods, elements previously unknown to be involved in a phenotype can be identified, for example in relationship to health conditions, external stress or drug response, in particular in cancer.