Rapid in vivo multiplexed editing (RIME) of the adult mouse liver

Background & Aims Assessing mammalian gene function in vivo has traditionally relied on manipulation of the mouse genome in embryonic stem cells or peri-zygotic embryos. These approaches are time consuming and require extensive breeding when simultaneous mutations in multiple genes is desired. The aim of this study is to introduce a Rapid In vivo Multiplexed Editing (RIME), and to provide a proof-of-concept of this system. Approach & Results RIME, a system wherein CRISPR/Cas9 technology, paired with adeno-associated viruses (AAVs), permits the inactivation of one or more genes in the adult mouse liver. The method is quick, requiring as little as 1 month from conceptualization to knockout (KO), and highly efficient, enabling editing in >95% of target cells. To highlight its utility, we used this system to inactivate, alone or in combination, genes with functions spanning metabolism, mitosis, mitochondrial maintenance, and cell proliferation. Conclusion RIME enables the rapid, efficient, and inexpensive analysis of multiple genes in the mouse liver in vivo . ### Competing Interest Statement Dr. Grompe consults for, received grants from, and owns stock in Ambys and LogicBio. He consults for and owns stock in Yecuris.