Synthetic oriP Plasmid Vector with TRF2 Half-Binding Sites

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Solution Overview

Problem

The lack of defined cis-acting elements in mammalian chromosomal origins of DNA synthesis hinders efficient initiation and maintenance of DNA synthesis, particularly in metazoan cells, where requirements for DNA replication origins are not well understood.

Innovation Solution

Engineered synthetic origins of DNA synthesis, modeled on the Epstein-Barr Virus (EBV) oriP, are designed with varying affinities for EBNA-1 and incorporating TRF2-half-binding sites to enhance the recruitment of licensing factors and replicative machinery, resulting in significantly more efficient DNA synthesis and extrachromosomal establishment compared to wild-type origins.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If wild-type DS origin is used, then DNA synthesis initiation occurs, but efficiency is limited and colony formation is reduced

Engineering Contradiction:

ImproveDNA synthesis efficiencyVSAvoidcolony formation stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the DS origin by changing the spacing parameter between EBNA-1 binding sites (from wild-type spacing to 21 bp center-to-center spacing) and by modifying the sequence parameters of the binding sites themselves to increase EBNA-1 affinity. These parameter changes result in synthetic origins that initiate DNA synthesis more efficiently and support better colony formation, directly resolving the contradiction between productivity and reliability.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If EBNA-1 binding sites are modified to increase affinity, then DNA synthesis initiation efficiency improves, but specificity may be affected

Engineering Contradiction:

ImproveDNA synthesis initiation efficiencyVSAvoidbinding site specificity

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by making specific modifications only to the EBNA-1 binding sites within the DS origin while preserving other critical elements. The binding sites are engineered to have increased EBNA-1 affinity through specific sequence changes, while the overall origin structure and other functional elements remain intact. This localized modification approach improves DNA synthesis initiation efficiency without compromising the overall specificity and function of the origin.

Inventive Principle:

Principle #3Local quality

3Productivity

If synthetic origins with varied EBNA-1 affinities are created, then DNA synthesis efficiency can be optimized, but origin structure complexity increases

Engineering Contradiction:

ImproveDNA synthesis efficiencyVSAvoidorigin structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent systematically varies parameters of the EBNA-1 binding sites (sequence composition, spacing distance) to create a series of synthetic origins with different EBNA-1 affinities. By changing only these specific parameters while maintaining the overall DS origin architecture, the patent optimizes DNA synthesis efficiency without introducing excessive structural complexity. The modifications are confined to the binding site regions rather than the entire origin structure.

Inventive Principle:

Principle #35Parameter changes

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

The synthetic origins demonstrate enhanced efficiency in initiating DNA synthesis and maintaining linked sequences, leading to increased colony formation and prolonged stability, with some configurations showing up to 10-fold greater efficiency than wild-type DS, making them suitable for gene therapy and transformation of difficult-to-transform cells like stem cells.

Implementation Method 1

The synthetic origin of DNA synthesis includes at least two binding sites for EBNA-1, e.g., at least two pairs of binding sites for EBNA-1

Methodology Applied

Scientific EffectProtein-DNA binding:

Implementation Method 2

which are flanked by at least two half-binding sites for TRF2 or at least two binding sites for a protein that enhances the affinity of EBNA-1 for the synthetic origin of DNA synthesis

Methodology Applied

Scientific EffectProtein-DNA binding:

Implementation Method 3

is capable of initiating DNA synthesis of linked sequences and maintaining the linked sequences in a cell

Methodology Applied

Scientific EffectDNA replication:

Implementation Method 4

efficiently supports licensed DNA synthesis in a variety of higher eukaryotic cells

Methodology Applied

Scientific EffectPlasmid maintenance:

Data Source

PatentUS9206439B2Efficient <i>oriP</i>/EBNA-1 plasmid vector

Publication Date: 2015.12.08 WISCONSIN ALUMNI RES FOUND

AI summary

The invention provides a recombinant vector comprising a DNA segment having a synthetic origin of DNA synthesis that binds EBNA-1 and is capable of initiating DNA synthesis of sequences linked to the synthetic origin of DNA synthesis and maintaining the linked sequences when in the presence of EBNA-1. The synthetic origin of DNA synthesis comprises at least two binding sites for EBNA-1, wherein the two EBNA-1 binding sites are flanked by at least two half-binding sites for TRF2 or at least two binding sites for a protein that enhances the affinity of EBNA-1 for the synthetic origin of DNA synthesis. Further provided are host cells with the vector and methods of using the vector, for instance, ex vivo or in vivo.