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<p>To correct the mutation, we are utilizing Prime Editing technologies. Prime Editing is a genome editing technique that allows precise DNA modifications without causing double-strand breaks<ahref="#desc-two"><sup>2</sup></a>. Structurally, the Prime Editing complex consists of a Cas9 endonuclease fused to a reverse transcriptase (RT) and guided by a pegRNA, which directs the complex to the target site in the genome. </p>
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<p>However, the Prime Editing complex is relatively large, posing challenges for therapeutic delivery<ahref="#desc-three"><sup>3</sup></a>. Additionally, Prime Editing has been shown to be relatively inefficient in terms of gene editing rates, which could limit its therapeutic utility<ahref="#desc-four"><sup>4</sup></a>. Our project aims to enhance the Prime Editing approach by miniaturizing its components. Fanzor, a recently discovered eukaryotic endonuclease, performs functions similar to Cas9, a crucial part of the Prime Editing complex, but is significantly smaller. We aim to substitute Cas9 with Fanzor. </p>
<p>However, the Prime Editing complex is relatively large, posing challenges for therapeutic delivery<ahref="#desc-three"><sup>3</sup></a>. Additionally, Prime Editing has been shown to be relatively inefficient in terms of gene editing rates, which could limit its therapeutic utility<ahref="#desc-four"><sup>4</sup></a>. Our project aims to enhance the Prime Editing approach by miniaturizing its components. Fanzor, a recently discovered eukaryotic endonuclease, performs functions similar to Cas9, a crucial part of the Prime Editing complex, but is significantly smaller. We aim to substitute Cas9 with Fanzor. </p>
<p>Additionally, we plan to replace the reverse transcriptase in the Prime Editing complex with a smaller RT variant. Furthermore, MCP proteins will be added to the Prime Editing complex to increase its stability<ahref="#desc-five"><sup>5</sup></a>. </p>
<p>The pegRNA is optimized via an extension by a stem loop, which stabilizes the RNA by protecting it from RNases and serves as a binding site for the MCP, which also supports the secondary RNA structure. Additionally, the pegRNA contains a riboswitch, a sodium ion-controlled regulator that switches off the complex. This represents a major biosafety feature in that the complex is switched off after successful DNA editing and the subsequent increased influx of chloride ions into the cell. The pegRNA is combined with an optimized sgRNA resulting in higher on-target effect. Overall, its optimization leads to a longer shelf life and an increase in the biosafety of the complex. </p>
<p>To correct the mutation, we are utilizing Prime Editing technologies. Prime Editing is a genome editing technique that allows precise DNA modifications without causing double-strand breaks<ahref="#desc-two"><sup>2</sup></a>. Structurally, the Prime Editing complex consists of a Cas9 endonuclease fused to a reverse transcriptase (RT) and guided by a pegRNA, which directs the complex to the target site in the genome. </p>
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<p>We are envisioning a potential integration into a broader therapeutic framework involving customized gene editing tools for various genetic disorders, that present similar problems/difficulties to the F508del mutation, as well as other genetic diseases of different causes. This could include collaborations with pharmaceutical companies to develop new treatment modalities for genetic diseases beyond cystic fibrosis, utilizing advanced delivery systems and personalized medicine approaches. </p>