Gene Drive System Using DNA Sequence Modification for Population Replacement
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Solution Overview
Problem
Current gene drive mechanisms face challenges in efficiently spreading transgenes across diverse species and maintaining high frequencies, particularly in invasive species and for population replacement, due to limitations in engineering diverse species and susceptibility to sequence variation and DNA loss.
Innovation Solution
A novel gene drive system utilizing a vector with a DNA sequence modifying enzyme, such as Cas9, that targets and inactivates essential genes, combined with a rescue transgene resistant to modification, allowing for population replacement by ensuring survival of organisms carrying the vector and eliminating those without it, thereby increasing vector frequency over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gene drive mechanisms are used, then transgene spreading is achieved, but efficiency and frequency maintenance are limited due to engineering constraints and sequence variation susceptibility
Solution Approach 1:
The patent converts the harmful effect of DNA sequence variation (which normally causes drive failure) into a benefit by designing the gene drive to specifically target and exploit these variations. The system uses DNA modifying enzymes to create targeted mutations that convert resistant alleles into susceptible ones, turning sequence variation from a barrier into a mechanism for drive propagation and frequency maintenance.
Solution Approach 2:
The patent introduces DNA modifying enzymes (such as CRISPR-Cas9, TALENs, or ZFNs) as intermediary molecules that mediate between the gene drive element and the target DNA sequence. These enzymes act as catalysts that facilitate targeted DNA modification, enabling the gene drive to overcome sequence variation barriers and maintain high frequencies despite engineering constraints across diverse species.
2Productivity
If DNA sequence modifying enzymes are used to target essential genes, then vector frequency increases, but fitness costs are imposed on carriers
Solution Approach 1:
The patent applies local quality by creating spatial and functional differentiation within the genome. The gene drive element is positioned at specific loci with DNA modifying enzymes that locally modify target sequences, while resistance genes are placed at different locations. This localized modification approach allows the system to achieve high vector frequency through targeted DNA modification while managing fitness costs through strategic gene placement and expression control.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the activity and expression levels of DNA modifying enzymes and resistance genes. Through regulatory elements and epigenetic mechanisms, the system can modulate enzyme expression to optimize the balance between drive propagation (increasing vector frequency) and fitness maintenance, allowing adaptive response to fitness costs across different environmental conditions.
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
This approach enables rapid and efficient spread of the gene drive system across populations, even with significant fitness costs, and is adaptable to various species by ensuring the vector's survival and propagation, overcoming limitations of existing methods.
Implementation Method 1
the nuclease cleaves and generates one or more double strand breaks in the endogenous copy of the essential gene
Implementation Method 2
the one or more double strand breaks are repaired to create an altered sequence of the essential gene
Implementation Method 3
the base editor creates one or more base changes in the endogenous copy of the essential gene to create an altered sequence of the essential gene
Data Source
AI summary
Described herein are embodiments relating to manipulation of populations and sex ratio in populations through DNA sequence modifications.