Template-Directed Gamma PNA Synthesis for Scalable Oligonucleotide Production

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Solution Overview

Problem

Conventional antisense and antigene approaches face challenges in scaling up oligonucleotide production due to high costs, cellular delivery limitations, and nonspecific binding, which hinders effective targeting of genetic sequences and can cause cytotoxic effects.

Innovation Solution

The development of gamma peptide nucleic acid (γPNA) recognition modules, which are small in size and chemically flexible, allowing for scalable solution-phase synthesis, enhanced cellular uptake, and specific binding through weak 'kissing' interactions, facilitating systemic delivery and reducing nonspecific binding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional step-wise solid-support oligonucleotide synthesis is used, then sequence-specific binding can be achieved, but production cost increases and scalability is limited

Engineering Contradiction:

Improvesequence-specific bindingVSAvoidproduction scalability

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent divides the oligonucleotide into multiple recognition modules of 3-8 nucleotides each, which are synthesized separately and then assembled. This segmentation enables parallel production and reduces the complexity of single-molecule synthesis, thereby improving scalability while maintaining sequence-specific binding through modular assembly

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines multiple recognition modules through ligation to form longer oligonucleotides. This merging approach allows the use of simpler, more scalable synthesis methods for individual modules while achieving the functional equivalent of conventional long-oligonucleotide synthesis through combination of smaller units

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If conventional long oligonucleotides are used for targeting, then binding specificity is improved, but cellular delivery becomes difficult due to large molecular weight

Engineering Contradiction:

Improvebinding specificityVSAvoidcellular delivery

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent segments long oligonucleotides into shorter recognition modules (3-8 nucleotides) that individually possess sufficient binding specificity for their target sequences. These shorter modules have lower molecular weights that facilitate cellular uptake and membrane permeability, thereby resolving the contradiction between binding specificity and deliverability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates universal recognition modules that can be assembled in different combinations to target various sequences. The modular design allows the same basic module structure to serve multiple targeting functions while maintaining small size for cellular delivery, making the system adaptable to different therapeutic applications

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If conventional oligonucleotides are synthesized at large scale, then production cost decreases, but nonspecific binding and cytotoxicity increase

Engineering Contradiction:

Improveproduction costVSAvoidnonspecific binding and cytotoxicity

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the oligonucleotide into short recognition modules that are synthesized in parallel at large scale, reducing production cost through economies of scale. The short length of individual modules (3-8 nucleotides) inherently reduces nonspecific binding compared to long oligonucleotides, and the modular assembly provides control over the final structure to minimize cytotoxicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making the recognition modules chemically distinct from conventional oligonucleotides through modified backbones or termini. This local chemical differentiation reduces nonspecific interactions and cytotoxic effects while maintaining the ability to bind specific targets, thereby reducing harmful effects without sacrificing productivity

Inventive Principle:

Principle #3Local quality

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

γPNA modules enable efficient and cost-effective large-scale production, improved cellular permeability, and targeted gene modulation with reduced cytotoxicity, making them suitable for treating genetic and infectious diseases, including those with unstable repeat expansions.

Implementation Method 1

the recognition modules will bind by Watson-Crick or Watson-Crick-like cooperative base pairing to a template nucleic acid

Methodology Applied

Scientific EffectWatson-Crick base pairing: Chemical Bonding

Implementation Method 2

contacting a template nucleic acid with a plurality of recognition modules... in a reducing environment

Methodology Applied

Scientific EffectReduction: Reduction

Data Source

PatentUS11319349B2Template-directed PNA synthesis process and PNA targeting compounds

Publication Date: 2022.05.03 CARNEGIE MELLON UNIV

AI summary

Described herein are recognition modules that bind specifically to a template nucleic acid and which ligate together in a reducing environment to produce a gamma peptide nucleic acid (γPNA) oligomer. Also provided are methods of synthesizing a γPNA oligomer on a template using the recognition modules.