文献类型：期刊文献

英文题名：A Versatile tRNA-gRNA Array-Based CRISPR/Cas9 Platform Enabling Multiplex Genome Editing and Large-Fragment Engineering in Acremonium chrysogenum

作者：Chen, Zhen[1];Hong, Wei[1];Wei, Xiaorong[1];Li, Yifan[1];Feng, Tao[1];Ke, Xiang[1];Li, Xu[1];Wang, Yongming[2];Hang, Haifeng[1];Tian, Xiwei[1];Chu, Ju[1]

机构：[1]East China Univ Sci & Technol, Qingdao Innovat Inst, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]Fudan Univ, Pudong Med Ctr, Shanghai Pudong Hosp, Ctr Med Res & Innovat,Shanghai Engn Res Ctr Ind Mi, Shanghai 201300, Peoples R China

年份：2026

外文期刊名：ACS SYNTHETIC BIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001753434300001)】；

基金：This work was supported by the National Key Research and Development Program of China (2024YFA0917700), the National Natural Science Foundation of China (32501316), the Taishan Scholars Program of Shandong Province (tsqn202312316), the Shanghai Pilot Program for Basic Research (22TQ1400100-14), the Shanghai Science and Technology Innovation Action Plan (24HC2810100), the Key R&D Program (Science and Technology Demonstration Project) program of Shandong Province (2022SFGC0104), the Natural Science Foundation of Shanghai (23ZR1416500), the Fundamental Research Funds for the Central Universities (JKV01251708). The authors also acknowledge financial support from the Arawana Charity Foundation.

语种：英文

外文关键词：Acremonium chrysogenum; tRNA-gRNA; CRISPR/Cas9; multiplex genome editing; pcbAB; large-fragment engineering

摘要：Cephalosporin C (CPC)-derived antibiotics have played a vital role in improving human health and extending life expectancy. Acremonium chrysogenum remains the only microorganism capable of industrial-scale CPC production to date. However, the lack of efficient multiplex genome-editing tools has limited studies on its gene function, high-yield mechanisms as well as metabolic engineering. To overcome this limitation, a rapid and efficient CRISPR/Cas9-based multiplex genome-editing system was developed, driven by endogenous tRNA promoters, enabling one-step multilocus knockout, large-fragment DNA deletion, and gene overexpression in A. chrysogenum. Given that many strains lack visible phenotypes associated with specific genes, we introduced a visually distinguishable red phenotype by expressing the heterologous protein mCherry under a strong promoter. In the wild-type strain, 20 endogenous tRNA promoters were evaluated and compared to the heterologous Aspergillus nidulans PgpdA and Aspergillus fumigatus U6 promoters. The endogenous tRNAVal promoter showed the highest knockout efficiency (95.5%). The tRNA-gRNA array-based CRISPR/Cas9 system enabled double- and triple-site knockouts without donor DNA in industrial strain, with efficiencies of 50.0-83.3% and 14.3%, respectively. This is the first demonstration of simultaneous triple-site knockout in A. chrysogenum, especially in industrial strain. Using this system, we successfully deleted a 50.7-kb DNA fragment containing the sorbicillinoids biosynthetic gene cluster with nearly 100% efficiency and achieved overexpression of the key gene pcbAB involved in CPC biosynthesis in high-yield strain, increasing CPC titer from 5.59 g/L to 6.92 g/L with an improvement of 23.8%. Overall, this tRNA-gRNA array-based CRISPR/Cas9 multiplex gene-editing system provides an efficient and versatile platform for functional genomics and industrial strain engineering in A. chrysogenum.