TET Protein Oxidation of 5-Methylcytosine for DNA Methylation Detection
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Solution Overview
Problem
Current technologies lack the identification of enzymes responsible for active DNA demethylation and methods to detect changes in DNA methylation status, which are crucial for regulating stem cell functions and treating cancer.
Innovation Solution
Identification of the TET family of enzymes (TET1, TET2, TET3, and CXXC4) that convert 5-methylcytosine to 5-hydroxymethylcytosine through hydroxylation, and development of methods to detect 5-hydroxymethylcytosine using novel assays and antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TET family enzymes are used to convert 5-methylcytosine to 5-hydroxymethylcytosine, then active DNA demethylation is achieved, but the mechanism and detection methods were previously unknown
Solution Approach 1:
The patent applies preliminary action by performing biochemical experiments (TLC analysis, mass spectrometry) beforehand to identify and characterize the conversion of 5-methylcytosine to 5-hydroxymethylcytosine by TET enzymes, establishing the demethylation mechanism before clinical applications
Solution Approach 2:
The patent uses antibodies specific to 5-hydroxymethylcytosine as intermediaries to detect and measure the activity of TET enzymes, enabling the observation and quantification of the demethylation process that was previously undetectable
2Measurement precision
If methods to detect 5-hydroxymethylcytosine are developed, then DNA methylation status changes can be monitored, but novel assays and antibodies are required
Solution Approach 1:
The patent extracts and isolates 5-hydroxymethylcytosine from complex DNA samples using biochemical methods (TLC, HPLC), separating it from other nucleotides to enable specific detection without requiring analysis of the entire genomic complexity
Solution Approach 2:
The patent employs colorimetric detection methods where antibodies bound to 5-hydroxymethylcytosine produce detectable color changes or fluorescent signals, allowing precise measurement of methylation status through optical property changes
3Productivity
If TET family enzymes are overexpressed in somatic cells, then reprogramming efficiency into pluripotent cells is enhanced, but cell differentiation control is affected
Solution Approach 1:
The patent applies dynamics by controlling the temporal expression and activity of TET enzymes during the reprogramming process, allowing the system to transition from differentiated to pluripotent state through regulated enzymatic activity rather than static conditions
Solution Approach 2:
The patent changes the biochemical parameters of DNA methylation by modulating TET enzyme activity levels, which alters the methylation status of genomic regions and thereby controls cell fate decisions between differentiation and pluripotency
4Reliability
If DNA methylation is modulated for cancer treatment, then therapeutic strategies are improved, but diagnostic methods must be developed
Solution Approach 1:
The patent uses specific antibodies against 5-hydroxymethylcytosine as intermediaries to detect methylation changes in cancer cells, enabling non-invasive diagnostic measurement of DNA methylation status that correlates with cancer progression and treatment response
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
Enhances the reprogramming of somatic cells into pluripotent cells, improves stem cell therapies, and provides diagnostic and therapeutic strategies for myeloid cancers by modulating DNA methylation status.
Implementation Method 1
convert 5-methylcytosine to 5-hydroxymethylcytosine through hydroxylation
Data Source
AI summary
The present invention provides for novel methods for regulating and detecting the cytosine methylation status of DNA. The invention is based upon identification of a novel and surprising catalytic activity for the family of TET proteins, namely TET1, TET2, TET3, and CXXC4. The novel activity is related to the enzymes being capable of converting the cytosine nucleotide 5-methylcytosine into 5-hydroxymethylcytosine by hydroxylation.