Two-Dimensional cDNA Library for Spatial Gene Expression Analysis
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Solution Overview
Problem
Current gene expression analysis methods, particularly those using PCR amplification and DNA chips, suffer from low accuracy in quantitative analysis, especially when analyzing mRNA from single cells or low-expression genes, and fail to provide detailed two-dimensional information of gene expression in biological tissues.
Innovation Solution
A method involving the preparation of a two-dimensional cDNA library by hybridizing test nucleic acids with immobilized nucleic acid probes on a support, synthesizing complementary cDNA, and detecting gene expression using this library, which retains positional information of cells within a tissue, allowing for precise analysis of gene expression profiles at specific sites within a single cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PCR amplification and DNA chip methods are used for gene expression analysis, then the analysis can be performed, but the accuracy of quantitative analysis is low
Solution Approach 1:
The invention divides the tissue into multiple sections and analyzes gene expression in each section separately using in situ hybridization, rather than homogenizing the entire tissue. This segmentation preserves spatial information and allows accurate quantitative analysis of gene expression at specific locations within the tissue.
Solution Approach 2:
The invention transitions from conventional two-dimensional DNA chip analysis to three-dimensional in situ hybridization within tissue sections, preserving the spatial dimension. This allows simultaneous quantitative measurement of multiple genes while maintaining their positional information within the tissue architecture.
2Quantity of substance
If mRNA is extracted from single cells for quantitative analysis, then single cell analysis is possible, but the number of mRNAs is low making quantitative analysis difficult
Solution Approach 1:
The invention performs preliminary amplification of mRNA to cDNA conversion within the tissue section before hybridization. This preliminary action increases the quantity of detectable material while preserving spatial information, enabling accurate quantitative analysis even when starting with low numbers of mRNA copies from single cells or small tissue regions.
3Adaptability or versatility
If the sample is divided into portions for quantitative analysis of multiple genes, then each gene can be analyzed, but genes of low expression level cannot be measured
Solution Approach 1:
The invention uses a universal in situ hybridization approach that can simultaneously detect and quantify multiple genes of different expression levels within the same tissue section. By using gene-specific probes with optimized labeling, the method can detect both highly expressed and lowly expressed genes without requiring separate analyses, thus maintaining versatility while improving detection sensitivity.
4Loss of information
If fluorescent probes are used to observe gene expression in tissue, then positional information is preserved, but only one or two genes can be observed
Solution Approach 1:
The invention employs multiple fluorescent probes with different emission wavelengths (colors) that can simultaneously hybridize to different genes within the same tissue section. This allows visualization and quantitative analysis of multiple genes while preserving their spatial distribution, overcoming the limitation of observing only one or two genes with conventional fluorescent probes.
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 enables accurate and efficient detection of gene expression levels in individual cells and tissues, providing detailed two-dimensional information that enhances our understanding of cellular interactions and biological processes, particularly useful in regenerative medicine and drug development.
Implementation Method 1
hybridizing a test nucleic acid in a sample with a nucleic acid probe
Data Source
AI summary
The present invention provides a method and/or means for collecting and analyzing an individual cell in a tissue, and at the same time, quantitatively monitoring the expression levels of various genes while keeping two-dimensional information in the tissue. Specifically, the present invention provides a method comprising preparing a cDNA library from mRNA while keeping two-dimensional cellular distribution information and obtaining the gene expression levels at any site or all sites at a level of single cell. More specifically, the present invention provides a method comprising preparing a cDNA library in a sheet-form from mRNA while keeping two-dimensional cellular distribution information and repeatedly using the cDNA library in the detection of the gene expression, thereby allowing measurement of the expression distribution for a number of genes at a high accuracy.