Guide RNA-Directed RNA Methylation Editors With Low Off-Target Activity
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Solution Overview
Problem
Current methods lack the ability to efficiently and specifically target the addition or removal of methylation sites in RNA, which are crucial for understanding and manipulating epigenetic changes associated with cellular processes and diseases such as cancer.
Innovation Solution
Development of RNA programmable methylation 'writers' and demethylation 'erasers' in the form of fusion proteins, which can install or remove methyl groups in RNA molecules, including those with RNA binding domains and effector domains like METTL3 or ALKBH5, to modulate the methylation state of RNA targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methylation methods are used, then methylation sites can be modified, but specificity and efficiency in targeting RNA molecules are insufficient
Solution Approach 1:
The patent employs guide RNA molecules as intermediaries to bridge the methyltransferase enzymes and target RNA sequences. The guide RNA specifically binds to complementary sequences in the target RNA through base pairing, directing the methyltransferase to the precise methylation site. This intermediary mechanism enables both high specificity (through sequence-complementary binding) and high efficiency (through enzymatic catalysis), resolving the technical contradiction between targeting precision and editing productivity.
Solution Approach 2:
The patent creates a universal RNA methylation editing platform that can target multiple different RNA sequences by simply changing the guide RNA sequence while keeping the core methyltransferase enzyme the same. The system combines the sequence-specific recognition capability of guide RNA with the catalytic activity of methyltransferase, creating a multi-functional system that achieves both high specificity for individual targets and high productivity through reusable enzymatic components.
2Adaptability or versatility
If RNA methylation editing is performed, then epigenetic changes can be manipulated, but off-target modifications may occur
Solution Approach 1:
The patent achieves local quality by concentrating the methylation activity precisely at the target site through guide RNA-directed recruitment of methyltransferase. The guide RNA ensures that only the specific complementary sequence receives methylation modification, while surrounding and unrelated sequences remain unaffected. This localized action enables versatile manipulation of epigenetic changes at specific loci while minimizing harmful off-target modifications elsewhere in the RNA pool.
Solution Approach 2:
The system incorporates sequence-specific recognition as a feedback mechanism where the guide RNA continuously verifies complementarity with the target RNA before allowing methylation to proceed. This feedback control ensures that methylation activity is activated only when the correct target sequence is bound, preventing off-target modifications while maintaining the ability to manipulate epigenetic changes at the intended location.
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
These fusion proteins enable high-efficiency editing of RNA methylation states in both the nucleus and cytoplasm with minimal off-target modifications, offering potential therapeutic applications for diseases associated with aberrant RNA methylation patterns.
Implementation Method 1
fusion proteins comprising RNA programmable methylation 'writers' and demethylation 'erasers' for editing the methylation state of RNA targets
Implementation Method 2
an effector domain, wherein the effector domain is capable of adding or removing a methyl group in an RNA
Implementation Method 3
effector domain is capable of adding or removing a methyl group in an RNA
Data Source
AI summary
The disclosure provides programmable methylation “writers” and demethylation “erasers” for editing the methylation state of RNA targets, e.g., an RNA transcriptome. In particular, the disclosure provides RNA methylation editor polynucleotide contracts and vectors comprising (i) an RNA programmable RNA binding domain (RNApRNAbd); and (ii) an effector domain, wherein the effector domain is capable of adding or removing a methyl group in an RNA. The disclosed RNA methylation editor constructs are capable of achieving limited off-target modifications in RNA molecules. Further, the disclosure provides methods for making and using the programmable methylation editors to modifying the methylation state of RNA. The disclosure further provides complexes comprising a methylation writer protein and a guide RNA molecule and complexes comprising a demethylation eraser protein and a guide RNA molecule. The disclosure further provides pharmaceutical compositions and cells comprising the disclosed fusion proteins and complexes.