Horecka J, Davis RW. The 50:50 method for PCR-based seamless genome editing in yeast.
Yeast 2013;
31:103-12. [PMID:
24639370 DOI:
10.1002/yea.2992]
[Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Revised: 11/11/2013] [Accepted: 11/15/2013] [Indexed: 11/09/2022] Open
Abstract
The ability to edit the yeast genome with relative ease has contributed to the organism being a model eukaryote for decades. Most methods for deleting, inserting or altering genomic sequences require transformation with DNA that carries the desired change and a selectable marker. One-step genome editing methods retain the selectable marker. Seamless genome editing methods require more steps and a marker that can be used for both positive and negative selection, such as URA3. Here we describe the PCR-based 50:50 method for seamless genome editing, which requires only two primers, one PCR with a URA3 cassette, and a single yeast transformation. Our method is based on pop-in/pop-out gene replacement and is amenable to the facile creation of genomic deletions and short insertions or substitutions. We used the 50:50 method to make two conservative loss-of-function mutations in MATα1, with results suggesting that the wild-type gene has a new function outside of that presently known.
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