Editing of ADE2 in C. metapsilosis.

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Editing of ADE2 in C. metapsilosis. Editing of ADE2 in C. metapsilosis. (A) Plasmid pCP-tRNA propagates in C. metapsilosis SZMC8093, and it is lost after two passages on YPD in the absence of nourseothricin (NTC, 200 μg/ml). (B) C. metapsilosis was transformed with plasmid pCP-tRNA-CmADE2b, targeting CmADE2 either without (left side) or with (right side) a repair template (CmRTADE2b, generated by overlapping PCR with primers CmRTADE2b_TOP/CmRTADE2b_BOT) designed to introduce two stop codons. The transformants were replica plated on YPD and Sc-Ade. Almost all colonies were pink and were unable to grow in the absence of adenine. (C) In the presence of the repair template, most transformants contained the inserted stop codons, identified by PCR using primers pCmADE2b_FWD and CmADE2_REV. Results of colony PCR of 15 representative colonies are shown; more are shown in Fig. S1 at https://doi.org/10.6084/m9.figshare.7776761. The wild-type (WT) strain was included as a control. (D) Many pink transformants were obtained even in the absence of the repair template. Sequencing of the region surrounding the Cas9 cut site revealed a variety of repair events, including insertions and deletions (indicated in red), resulting in either frameshift or deletion of His23. These presumably resulted from NHEJ. Lisa Lombardi et al. mSphere 2019; doi:10.1128/mSphere.00125-19