ArticleMethods in molecular biology (Clifton, N.J.)2026
High-Throughput Generation of Pichia pastoris Knock-Out Strains by Using CRISPR/Cas9.
Article in Methods in molecular biology (Clifton, N.J.), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The CRISPR/Cas9 (CRISPR is an acronym for clustered regularly interspaced short palindromic repeats) system is a powerful molecular biological tool simplifying the process of genome engineering. Originally demonstrated to function in human and mouse cells, the portfolio of organisms that can be engineered by the new and groundbreaking technology was soon expanded. In the past years, CRISPR/Cas9 tools for use in Komagataella phaffii were reported to allow the generation of K. phaffii mutant strains in less than 2 weeks. In addition, the K. phaffii tailored system uses episomal vectors for the expression of the CRISPR/Cas9 elements, which allows the recycling of the plasmid after the CRISPR editing to obtain empty mutant strains. This means that the engineered strains do not carry the expression cassette of the resistance marker and CRISPR/Cas9 plasmid in their genome and are therefore a superb starting point for further investigations.In this chapter, we describe a pipeline for the high-throughput generation of K. phaffii mutant strains with interrupted open reading frames of genes, by using the CRISPR/Cas9 system in combination with error-prone repair of the double-strand break by NHEJ. The pipeline we developed consists of four steps: (a) CRISPR/Cas9 plasmids assembly, (b) transformation of K. phaffii, (c) screening for mutant strains, and (d) plasmid elimination and is due to the detailed description of every step being easily reproducible. To intensify and simplify the research work, most of the described procedures can be performed in a 96-well format.
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