28-Codon Leader Sequence for mRNA Folding Stability

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Solution Overview

Problem

Current methods for enhancing gene expression in recombinant protein production, such as mutating regulator regions or altering codons, are inefficient and require significant modifications, making it difficult to achieve high expression levels without substantial changes to the gene sequence.

Innovation Solution

Incorporating a leader sequence, specifically the 28-codon tag (SEQ ID NO: 12), at the 5′ terminus of a desired gene to improve mRNA folding stability near the ribosomal binding site, thereby enhancing protein expression without altering the gene's codon sequence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If regulator regions are mutated to increase transcription, then gene expression is enhanced, but the gene sequence requires substantial modifications

Engineering Contradiction:

Improvegene expression levelVSAvoidgene sequence modification

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces a leader sequence as an intermediary element between the promoter and the coding sequence. This leader sequence acts as a mediator that enhances translation efficiency without requiring modifications to the coding sequence itself. The leader sequence includes specific structural features (anionic patch, amphipathic helix, basic patch) that facilitate ribosome binding and translation initiation, thereby resolving the contradiction between enhancing expression and maintaining sequence integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If codons in the coding sequence are mutated to enhance protein stability, then expression is improved, but the complexity of identifying and altering inhibitory sequences increases

Engineering Contradiction:

Improveprotein stability and expressionVSAvoidsequence identification and modification

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts the expression enhancement function from the coding sequence itself and places it in a separate leader sequence. By taking out the translational enhancement elements and positioning them in the 5' leader region, the invention eliminates the need to search for and modify potential inhibitory sequences within the coding region. The leader sequence contains all necessary elements (anionic patch, amphipathic helix, basic patch) to enhance translation independently of the coding sequence.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If extensive modifications are made to achieve high expression levels, then productivity increases, but the ease of manufacture decreases

Engineering Contradiction:

Improverecombinant protein productionVSAvoidgene construction process

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent segments the expression cassette into distinct functional modules: a promoter region, a leader sequence with specific structural features (anionic patch, amphipathic helix, basic patch), and a coding sequence. This segmentation allows each element to be optimized and assembled independently using standard molecular biology techniques, greatly simplifying the manufacturing process compared to extensive whole-gene modification.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8679790B2Leader sequence to boost gene expression

Publication Date: 2014.03.25 THE TRUSTEES OF THE UNIV OF PENNSYLVANIA

AI summary

The invention provides compositions and methods for enhanced gene expression. The invention provides a composition comprising a 28-codon leader sequence operably linked to a desired gene which encodes the desired protein.