Fecha de publicación: 15/01/2025 Fuente: WIPO "tomato" The present invention relates to the field of genetic engineering. Specifically, the present invention relates to cytosine deaminase and use thereof in base editing. More specifically, the present invention relates to a base editing system based on a newly identified cytosine deaminase, a method for base editing a target sequence in the genome of an organism (e.g., a plant) using the base editing system, and a genetically modified organism (e.g., a plant) produced by the method and progenies thereof.