周五直播！ 卢培龙课题组开发新型线粒体DNA编辑工具：全新计算设计、超高精度

Core Viewpoint - Mitochondrial DNA (mtDNA) mutations can lead to various rare genetic diseases, and traditional gene editing tools face significant challenges in targeting mtDNA effectively. A new base editor has been developed to address these challenges, providing a promising direction for mitochondrial gene therapy [1][3]. Group 1: Research Highlights - The research team has developed a novel protein design strategy that creates a rigid interface between the DNA-binding TALE domain and the cytosine deaminase, forming a unified editing module called TOD (TALE-oriented deaminase). This design minimizes off-target effects by strictly limiting the activity window of the deaminase [3]. - The structure of the TOD-DNA complex was validated using cryo-electron microscopy (Cryo-EM), confirming that the rigid interface effectively constrains the deaminase's action range, thereby supporting the functionality of minimizing unintended edits [3]. - A split version of the editing system, DdCBE-TOD, was developed to further enhance specificity, achieving a near-elimination of off-target editing, addressing the dual issues of "nuclear cross-targeting" and bystander editing present in traditional tools [3]. Group 2: Functional Validation - The editing system has successfully constructed a mitochondrial disease mouse model and precisely corrected pathogenic mutations associated with MERRF syndrome in patient-derived cells, demonstrating single-nucleotide editing precision and showcasing its dual application value in disease model construction and pathogenic mutation repair [4]. Group 3: Upcoming Events - A series of webinars titled "Frontier Technologies and Translational Applications in Molecular Biology" will be held, featuring a presentation by Assistant Researcher Mi Li on "Computational Design of High-Precision Mitochondrial DNA Cytosine Base Editor" [5][6].