Abstract
DNA repair after Cas9 cutting can result in deletions/insertions, genomic rearrangements, and rare nucleotide substitutions. However, most work has only focused on deletions/insertions resulting from repair after CRISPR-Cas9 action. Here, we comprehensively analyzed the editing outcomes induced by CRISPR-Cas9 treatment in yeast Xanthophyllomyces dendrorhous by Sanger and Illumina sequencing and identified diverse DNA repair patterns, including DNA deletions, interchromosomal translocations, and on-target nucleotide substitutions (point mutations). Some deletions were observed repeatedly, and others, especially large deletions, varied in size. Genome sequencing and structural variation analysis showed that the interchromosomal translocations happened between Cas9 target sites and the endogenous ADH4 promoter. In contrast to previous studies, analysis revealed that the on-target point mutations were not random. Importantly, these point mutations showed strong sequence dependence that is not consistent with previous work in Hela cells, where CRISPR-mediated substitutions were found to lack sequence dependence and conversion preferences. Finally, we found that the non-homologous end joining components Ku70, Ku80, Mre11, or RAD50, and the overlapping roles of non-essential DNA polymerases were necessary for the production of both point mutations and deletions. This work expands our knowledge of CRISPR-Cas9 mediated DNA repair.
Get full access to this article
View all access options for this article.
References
Supplementary Material
Please find the following supplemental material available below.
For Open Access articles published under a Creative Commons License, all supplemental material carries the same license as the article it is associated with.
For non-Open Access articles published, all supplemental material carries a non-exclusive license, and permission requests for re-use of supplemental material or any part of supplemental material shall be sent directly to the copyright owner as specified in the copyright notice associated with the article.
