Recombinant Pro-Methylation Cis-Element for Targeted Gene Silencing
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Solution Overview
Problem
The role of aberrant DNA methylation in cancer remains unclear, particularly whether it acts as a causal factor in tumorigenesis, and existing methods lack the ability to specifically target and test the impact of methylation on genes like p16Ink4a, a key tumor suppressor.
Innovation Solution
The use of recombinant pro-methylation cis-elements that recruit DNA methyltransferases to specific genomic regions, such as the p16Ink4a promoter, to induce hypermethylation and assess its effect on gene expression and tumorigenesis in mice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to study DNA methylation, then general methylation patterns can be observed, but specific causal role of methylation on target genes cannot be determined
Solution Approach 1:
The patent introduces pro-methylation cis-element sequences as intermediary elements that mediate between the endogenous DNA methyltransferase machinery and specific target gene promoters. These cis-elements act as recruitment platforms that direct methylation to specific loci without requiring direct manipulation of the methyltransferase enzymes themselves, thereby enabling precise causal assessment of methylation effects on gene expression and tumorigenesis.
Solution Approach 2:
The invention segments the methylation process by separating the methylation machinery (endogenous DNA methyltransferases) from the target site selection. By inserting discrete pro-methylation cis-element sequences into regulatory regions of specific genes, the system divides the complex methylation phenomenon into controllable modular units that can be independently studied for their causal role in tumorigenesis.
2Manufacturing precision
If endogenous DNA methyltransferases are recruited to specific genomic regions, then targeted hypermethylation can be induced, but the system requires complex recombinant constructs
Solution Approach 1:
The pro-methylation cis-element sequences are designed to autonomously recruit endogenous DNA methyltransferases to target genomic regions without requiring external guidance or additional engineered protein components. The cis-elements contain intrinsic sequence features that self-organize to bind and concentrate methyltransferase enzymes, enabling targeted hypermethylation through the sequences' own properties rather than through complex externally controlled systems.
3Reliability
If promoter CGI hypermethylation is studied in cancer models, then epigenetic alterations can be observed, but causal relationship with tumorigenesis remains unclear
Solution Approach 1:
The invention implements preliminary action by pre-installing pro-methylation cis-element sequences into the regulatory regions of tumor suppressor genes such as p16 before cancer development occurs. This preliminary genetic modification sets up a controlled system where targeted hypermethylation can be induced at will, allowing researchers to establish causal relationships between methylation and tumorigenesis by observing cancer development in the presence versus absence of induced methylation.
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 direct evidence that p16Ink4a epimutation drives tumorigenesis and offers a novel method for studying the causal role of epigenetic alterations in cancer, demonstrating a link between promoter hypermethylation and tumor formation.
Implementation Method 1
one or more sequences that recruit one or more enzymes to increase CpG methylation are employed in a regulatory region of the gene
Data Source
AI summary
Embodiments of the disclosure concern compositions and methods for genetic engineering related to hypermethylation of sequences. In particular embodiments, there are methods and compositions to induce DNA methylation in a manner that leads to transcriptional suppression of a target gene that allows characterization of the gene and/or its expression.