C. elegans Knockout Services
Knockouts are the bread and butter of reverse genetic studies. They allow researchers to study the effects of the absence of a particular gene, protein segment, amino acid, or regulatory element, thereby enabling the researcher to determine their function. Gene knockouts are a commonly used tool for biologists to understand gene function. Examination of phenotypes when the gene is deleted can reveal insights into what role that gene plays in the organism.
Full, Partial and Conditional Gene Deletion
Full Gene Deletion
If your research requires a line with the deletion of a full gene we recommend working with a precise knockout (instead of an early stop inserted resulting in a partial gene product) to ensure the accuracy of your studies. Any genomic region can be targeted for deletion.
We can delete the entire coding sequence of a gene using CRISPR/Cas9. You can then study the phenotype of the true null allele with no concern that any protein function remains. Our transgenic designers and process ensure that each knockout we make is exactly the right strain to answer the research question.
Partial Gene Deletion
The Precise Deletion service uses CRISPR/Cas9 genome editing to remove a small defined region of DNA. This can be useful for deleting protein domains, DNA regulatory regions, or any other sequence of your choice.
Deletions can also be performed in coding regions for functional analysis of protein domains or to isolating isoform function. Transcription binding sites or introns can be deleted to reveal information about gene regulation.
Conditional Gene Deletion
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.
- 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.
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).
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.
Service Details (price reflects academic pricing)
|Service Package||Price||Est. Delivery Time|
|Full Build||$4,075 and up||6 Weeks and up|
|Candidate Lines||$2,554 and up||3 Weeks and up|
|Custom Injection Mix||$995 and up||1 - 2 Weeks|