Vectors increase flexibility of gene knockout

Used in conjunction with these three new vectors, the TargeTron gene knockout system provides researchers with a more flexible tool for generating prokaryotic knockouts

Sigma-Aldrich announces the introduction of new TargeTron vectors designed for use with the TargeTron gene knockout system.

The new vectors enhance the capabilities and increase the flexibility of the TargeTron gene knockout system providing researchers with an efficient, targeted method to knock out multiple genes in prokaryotic organisms, to generate knockouts without using selection or by using removable selection, and to use the TargeTron gene knockout system to produce knockouts in organisms lacking a source of T7 RNA polymerase.

The TargeTron vector pACD4K-C-loxP is a linerised E coli expression vector containing loxP sites to facilitate the removal of the kanamycin marker.

This enables the generation of multiple, site-specific knockouts in the same bacterial chromosome.

The pACD4 TargeTron vector set (no selectable marker) contains four linerised vectors lacking the kanamycin RAM marker.

Additionally, each vector has an A, C, G, or T in the delta +1 position.

This facilitates proper base pairing of the group II intron RNA for different target site designs resulting in more efficient precursor RNA splicing to form active TargeTron RNPs.

The pACD4 TargeTron vector set allows researchers to generate prokaryotic knockouts when selection cannot be used.

The reach of the TargeTron gene knockout system has been increased to an even broader range of bacterial hosts with the introduction of the pAR1219 TargeTron vector.

This vector provides a source of T7 RNA polymerase when co-transformed with TargeTron vector pACD4K-C, included in the TargeTron gene knockout system (TA0100).

Adding an external source of T7 RNA polymerase allows for the creation of knockouts in organisms such as salmonella typhimurium and shigella flexneri as well as in non-DE3 strains of E coli.

"The launch of these new vectors greatly expands the research applications of the TargeTron system," said Keith Jolliff, director of global marketing for molecular biology.

"They also exemplify our commitment to customer service.

"After we launched the TargeTron gene knockout kit, we asked customers what they felt was needed to improve the kit and to expand the applications.

"These vectors are the result of Sigma listening to our customers and addressing their needs".

The TargeTron Gene Knockout System is exclusively licensed from Ingex and is expected to revolutionise functional genomics and systems biology, says Sigma-Aldrich.

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