Cell Identification via DNA Replication Timing Profiles
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Solution Overview
Problem
Current methods for identifying and distinguishing cells are limited by the instability of RNA, sensitivity issues in protein-based approaches, and the high cost and complexity of epigenetic modification techniques, making them unsuitable for high-throughput analysis and clinical applications.
Innovation Solution
A method involving hybridization of fluorescently labeled DNA from cells to a high-resolution genomic array with an average probe spacing of 6 kb or less to determine replication timing profiles, allowing for the identification and distinction of cells by comparing these profiles to reference profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If RNA-based approaches are used for cell identification, then gene expression information can be obtained, but RNA instability causes degradation during sample collection, storage, and experimentation
Solution Approach 1:
The patent uses DNA replication timing profiles as a stable copy or surrogate marker for cell identification, replacing the unstable RNA molecules. Instead of directly measuring gene expression through RNA, the method measures the timing at which DNA regions are replicated, which reflects the same biological information but in a stable, non-degradable form that can be reliably detected through genomic arrays.
2Measurement precision
If protein-based approaches with single antibodies are used, then specific protein detection is achieved, but sufficient information to distinguish various cell types is not provided
Solution Approach 1:
The patent employs a universal approach by using replication timing profiles that can simultaneously provide information about multiple cell type characteristics. Instead of requiring multiple specific antibodies for different proteins, a single genomic array experiment captures comprehensive replication timing data across the genome, which serves as a multi-dimensional fingerprint for distinguishing various cell types.
3Adaptability or versatility
If mRNA detection is used to reflect gene expression, then cell type indication is achieved, but mRNA fluctuation in response to temporary environmental changes reduces reliability
Solution Approach 1:
The patent inverts the approach by instead of measuring the fluctuating product (mRNA), it measures the stable template (DNA replication timing). By looking at when DNA regions are replicated during S phase, the method captures cell identity information that is consistent across different environmental conditions, rather than the transient gene expression states that change with environment.
4Measurement precision
If high resolution genomic arrays with 6 kb or less probe spacing are used, then accurate replication timing profiles are obtained, but the complexity and cost of the analysis increases
Solution Approach 1:
The patent changes the resolution parameter of the genomic array to 6 kb or less probe spacing, which provides sufficient precision for detecting replication timing boundaries while avoiding the excessive complexity of higher resolution arrays. This parameter optimization balances measurement accuracy with practical feasibility, enabling accurate cell identification without prohibitively complex equipment and analysis 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
This approach provides a stable and reproducible means to identify and distinguish cells, overcoming the limitations of existing methods by using replication timing profiles that are related to chromatin states and not affected by transcription levels, enabling accurate and reliable cell identification and differentiation.
Implementation Method 1
hybridization of fluorescently labeled DNA from cells to a high-resolution genomic array
Implementation Method 2
fluorescently labeled DNA from cells
Data Source
AI summary
Methods for identifying and/or distinguishing a homogeneous population of cells based on their replication domain timing profile using high resolution genomic arrays or sequencing procedures are provided. These methods may be used to compare the replication timing profile for a population of cells to another replication timing profile(s), a replication timing fingerprint, and/or one or more informative segments of a replication timing fingerprint, which may be simultaneously or previously determined and/or contained in a database, to determine whether there is a match between them. Based on such information, the identity of the population of cells may be determined, or the identity of the population of cells may be distinguished from other populations of cells or cell types. Methods for determining a replication timing fingerprint for particular cell types are also provided.