McClean: Working with the LoxP/Cre System in S. cerevisiae

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The loxP/Cre recombinase system is an extremely powerful tool for genetic manipulation, allowing for conditional and site-specific integrations, excisions, and inversions, either in vivo or in vitro.

The loxP element is a 34 bp element, consisting of an 8bp region that confers directionality, flanked by 13 bp palindromic regions. The orientation of pairs of loxP sites determines the recombination outcome upon exposure to Cre recombinase. DNA in between loxP sites in opposing orientation is inverted while that in between sites facing the same direction is excised as a DNA circle, leaving a single loxP site, or "scar." Further, a pair of DNA molecules, at least one circular, each with a single loxP site, can be fused.

Using loxP/Cre in vivo with Yeast

A common use for the system in yeast is excising a selectable marker previously integrated into the genome. In such instances, a Cre+


Please feel free to post comments, questions, or improvements to this protocol. Happy to have your input!

  1. List troubleshooting tips here.
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Gietz, R.D. and R.A. Woods. (2002) TRANSFORMATION OF YEAST BY THE Liac/SS CARRIER DNA/PEG METHOD. Methods in Enzymology 350: 87-96.


or instead, discuss this protocol.

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