Search results
Results from the WOW.Com Content Network
Since URA3 allows for both positive and negative selection, it has been developed as a genetic marker for DNA transformations and other genetic techniques in bacteria and many fungal species. It is one of the most important genetic markers in yeast genetic modification. While URA3 is a powerful selectable marker, it has a high background.
The E. coli component of a yeast shuttle vector includes an origin of replication and a selectable marker, e.g. antibiotic resistance, beta lactamase, beta galactosidase. The yeast component of a yeast shuttle vector includes an autonomously replicating sequence (ARS), a yeast centromere (CEN), and a yeast selectable marker (e.g. URA3 , a gene ...
A selectable marker is a gene introduced into cells, especially bacteria or cells in culture, which confers one or more traits suitable for artificial selection.They are a type of reporter gene used in laboratory microbiology, molecular biology, and genetic engineering to indicate the success of a transfection or transformation or other procedure meant to introduce foreign DNA into a cell.
Figure 2: The bacteria one-hybrid system requires two customized plasmids: (a) the “bait” vector (pB1H1 or pB1H2) which expresses the DNA-binding domain as a fusion construct with a subunit (α or ω) of RNA polymerase, and (b) a reporter plasmid (pH3U3) containing selectable markers and a binding-site library, or “prey,” which will potentially interact with the "bait.”
Auxotrophic selection markers that allow an auxotrophic organism to grow in minimal growth medium may also be used; examples of these are LEU2 and URA3 which are used with their corresponding auxotrophic strains of yeast. [7] Another kind of selectable marker allows for the positive selection of plasmid with cloned gene.
Ligation of selectable marker into plasmid vector: this allows for the differential selection of colonies with, or without the marker gene. An antibiotic resistance gene allows the YAC vector to be amplified and selected for in E. coli by enabling E. coli containing the YAC vector to survive in the presence of an antibiotic.
5-Fluoroorotic acid (5FOA) is a fluorinated derivative of the pyrimidine precursor orotic acid.It is used in yeast genetics to select for the absence of the URA3 gene, which encodes the enzyme for the decarboxylation of 5-fluoroorotic acid to 5-fluorouracil, a toxic metabolite. [1]
A selectable marker confers some trait that can be easily selected for in a host cell, so that it can be determined whether transformation was successful. The most common selectable markers are genes for antibiotic resistance, so that host cells without the construct will die off when exposed to the antibody and only host cells with the ...