m6A Methylation in RNA 5' UTR Enables Cap-Independent Translation

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Solution Overview

Problem

The mechanism of cap-independent translation in cellular mRNAs is poorly understood, and the function of N6-methyladenosine (m6A) in the 5' untranslated region (UTR) remains unknown, limiting the enhancement of mRNA translation ability, especially under conditions where eukaryotic initiation factor 4E (eIF4E) activity is compromised.

Innovation Solution

Introducing a methylated adenosine residue, such as N6-methyladenosine (m6A), in the 5' untranslated region (UTR) of an RNA molecule enables eIF4E-independent translation by recruiting eukaryotic initiation factor 3 (eIF3), bypassing the need for the 5' cap, and enhancing translation ability through specific methylation mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cap-dependent translation mechanism is used, then translation efficiency is improved under normal conditions, but translation ability is compromised under stress conditions where eIF4E activity is reduced

Engineering Contradiction:

Improvetranslation efficiencyVSAvoidtranslation ability under stress

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The invention changes the chemical parameter of the RNA molecule by introducing m6A methylation at specific positions in the 5' UTR. This parameter change enables the RNA to switch from cap-dependent to cap-independent translation mechanism, allowing it to maintain translation ability under stress conditions where eIF4E activity is compromised while preserving translation efficiency under normal conditions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses m6A methylation as an intermediary mechanism that mediates between the 5' cap structure and the translation initiation machinery. The methylated adenosine residue serves as an alternative recognition site that can recruit translation factors independently of eIF4E, thus bridging the gap between cap structure and translation initiation under various cellular conditions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If m6A methylation is introduced in 5' UTR, then cap-independent translation is enabled, but the complexity of RNA modification increases

Engineering Contradiction:

Improvetranslation mechanism flexibilityVSAvoidRNA modification complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention applies preliminary action by pre-methylating the RNA molecule with m6A at specific positions in the 5' UTR before translation occurs. This pre-modification ensures that the RNA is already prepared with the necessary structural features to recruit translation machinery independently of the 5' cap, eliminating the need for complex post-transcriptional regulation and simplifying the overall translation initiation process

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11685923B2Methods of enhancing translation ability of RNA molecules, treatments, and kits

Publication Date: 2023.06.27 CORNELL UNIVERSITY

AI summary

The present invention relates to methods and a kit for enhancing the translation ability of an RNA molecule. The methods involve the use of an RNA molecule comprising a methylated adenosine residue in a 5′ untranslated region (UTR). Also disclosed are methods for eIF4E-independent translation of an RNA molecule and treatment methods.