Prime Editing Complex Corrects CFTR Gene Mutations
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Solution Overview
Problem
Current therapies for cystic fibrosis are ineffective for numerous mutations, and there is no cure for the disease, which affects the CFTR gene, leading to severe lung and organ damage.
Innovation Solution
Prime editing methods and compositions are used to correct mutations in the CFTR gene by employing a prime editing guide RNA (PEgRNA) that directs a prime editor to incorporate specific nucleotide edits into the CFTR gene, thereby correcting pathogenic mutations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current therapies are used for cystic fibrosis, then treatment is provided, but effectiveness is limited and no cure is achieved
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional therapy approaches to prime editing technology, which fundamentally changes the mechanism of action. The prime editing system uses engineered guide RNAs and polymerases to directly modify the CFTR gene sequence, enabling correction of mutations that were previously untreatable. This technological parameter change allows for precise genetic modification rather than symptomatic treatment.
Solution Approach 2:
The patent replaces the mechanical system of conventional therapies (which address symptoms rather than causes) with a molecular biology-based prime editing system. This substitution involves using CRISPR-Cas9 derived tools and reverse transcriptase to directly rewrite defective DNA sequences, replacing the indirect mechanical approach of symptom management with direct genetic correction.
2Manufacturing precision
If prime editing is used to correct CFTR gene mutations, then mutation correction is achieved, but the complexity of the editing system increases
Solution Approach 1:
The patent applies segmentation by dividing the prime editing system into distinct functional components: guide RNA molecules with specific spacer sequences, polymerase enzymes, and target DNA sequences. This segmentation allows each component to be optimized independently and facilitates the complex editing process through modular assembly of functional elements.
Solution Approach 2:
The patent uses intermediary molecules including guide RNAs and polymerase enzymes that mediate between the prime editing system and the CFTR gene. These intermediaries simplify the overall process by providing specific recognition sequences and catalytic functions, making the complex gene editing task manageable through coordinated molecular interactions.
3Reliability
If prime editing compositions are administered to treat cystic fibrosis, then treatment efficacy is improved, but the difficulty of delivery to target tissues increases
Solution Approach 1:
The patent employs copying mechanisms through the use of guide RNA molecules that create complementary DNA sequences. The reverse transcriptase enzyme copies the guide RNA sequence into DNA, which then integrates with the target CFTR gene. This copying process enables precise delivery of editing instructions to the correct genomic location.
Solution Approach 2:
The patent applies preliminary action by designing guide RNAs with specific spacer sequences that pre-identify target locations in the CFTR gene before editing occurs. The polymerase and guide RNA complex performs preliminary binding and positioning activities before the actual DNA modification, ensuring accurate delivery of the editing function to the intended target site.
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 prime editing approach efficiently corrects CFTR gene mutations, providing a potential treatment for cystic fibrosis by directly addressing disease-causing alterations in the gene.
Implementation Method 1
the spacer sequence of a PEgRNA recognizes and anneals with a search target sequence in a target strand of the target gene
Implementation Method 2
A prime editing complex may generate a nick in the target gene on the edit strand
Implementation Method 3
a single stranded DNA is synthesized using an editing template of the PEgRNA as a template
Data Source
AI summary
Provided herein are compositions and methods of using prime editing systems comprising prime editors and prime editing guide RNAs for treatment of genetic disorders such as cystic fibrosis.