C. elegans Mutation Packages

C. elegans Floxed Allele Service


Floxed allele can be created for tissue- or temporal- specific deletion of your gene of interest. This can be very useful when studying embryonic lethal genes or for understanding how your gene of interest functions in different tissues. CRISPR/Cas9 is used to insert loxP sites flanking the region to be deleted.

This line can then be crossed with a Cre-line expressing the Cre recombinase under a specific promoter or injected with a plasmid containing Cre recombinase. The Cre recombinase promotes recombination of the two loxP sites and the region between the sites is removed from the genome.

Conditional alleles

  • Used to make deletion of genes in site and time specific manner
  • Flank gene of interest with LoxP sites
  • Inject a plasmid or cross into strain that expresses Cre recombinase where/when/how you want loss-of-function to occur

We are able to build custom Cre recombinase-expressing lines to compliment your new floxed allele.

Service Details (price reflects academic pricing)

Service PackagePriceEst. Delivery Time
Full Build $4,4856 - 8 Weeks
Candidate Lines $2,9643 - 4 Weeks
Custom Injection Mix $1,395
1 - 2 Weeks

Floxed Allele Case Study

A client wanted a knockout (KO) of an embryonic lethal gene. We could not make this line using our standard methods. Instead, we inserted two loxP sites. One in the first intron of the gene and the second in the 3’utr. After we confirmed this line by PCR and sequencing, we injected this line with a ubiquitously expressing Cre Recombinase plasmid.

We found while the uninjected animals could reproduce, the Cre injected animals did not (Figure A). We tested recombination by PCR and found that only the Cre injected progeny showed recombination of the loxP sites (Figure B).

C. elegans Mutation - Floxed Allele FigA
Fig. A
C. elegans Mutation - Floxed Allele FigB
Fig. B

This line could be used to study KO of this gene in adulthood or in specific tissues, something that was not previously possible due to the embryonic lethality caused by the KO of this gene.


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