What is Cre function?
Cre recombinase plays important roles in the life cycle of the P1 bacteriophage. Upon infection of a cell the Cre-loxP system is used to cause circularization of the P1 DNA. In addition to this Cre is also used to resolve dimeric lysogenic P1 DNA that forms during the cell division of the phage.
How is Cre recombinase activated?
One of the ligand-dependent Cre recombinases is CreER recombinase, which consists of Cre fused to mutated hormone-binding domain of the estrogen receptor. The CreER recombinase is inactive but can be activated by the synthetic estrogen receptor ligand tamoxifen or 4-hydroxytamoxifen.
How does tamoxifen Cre work?
It utilizes a mutated estrogen receptor (ER) fused to Cre as a transgene (Cre-ER), which only becomes activated and then translocates into the nucleus upon binding of the active tamoxifen (TAM) metabolite 4-hydroxytamoxifen (4-OHT), which mutates the ER.
What is a lox site?
LoxP sites are sites recognized by the bacteriophage cre recombinase, which excises sequences lying between two loxP sites leaving behind only one of the two sites.
What is homologous recombination pathway?
Homologous recombination (HR) comprises a series of interrelated pathways that function in the repair of DNA double-stranded breaks (DSBs) and interstrand crosslinks (ICLs).
How does Mer Cre Mer work?
The tamoxifen inducible Cre recombinase (MerCreMer) is a fusion protein containing Cre recombinase with two modified estrogen receptor ligand binding domains at both ends, and is driven by the neural-specific rat neural specific enolase (NSE) promoter.
What does tamoxifen do to mice?
25, 26 Our results show that tamoxifen-treated mice showed altered social interaction, locomotor activity and anxiety. In the learned helplessness model, it has been reported that learned helplessness can result in depression.
What is the name of the site where Cre enzyme acts?
the LOX site
What is the name of the site where Cre enzyme acts? Explanation: The recombination site on the DNA where Cre acts are called the LOX site.
Is Cre a restriction enzyme?
Cre recom- bines the short linear segment into the circular DNA episomes, thereby lin- earizing the episome (Figure 1). Hence, Cre can act like a restriction enzyme that recognizes a 34-bp recognition se- quence.
Is homologous recombination a repair mechanism?
Homologous recombination repair is a DNA repair process that includes the invasion of an undamaged DNA molecule by a damaged molecule of identical or very similar sequence. Resynthesis of the damaged region is accomplished using the undamaged molecule as a template.
What is mer Cre Mer?
How does Cre tamoxifen work?
What is the Cre/Lox system?
The Cre/ lox system is one of the most powerful and versatile tools developed for mouse genetics. It gives mouse researchers sophisticated control over the location and timing of gene expression.
What is the function of the Cre protein?
The Cre protein is a site-specific DNA recombinase that can catalyse the recombination of DNA between specific sites in a DNA molecule. These sites, known as loxP sequences, contain specific binding sites for Cre that surround a directional core sequence where recombination can occur.
How does Cre/loxP recombination work?
How does Cre/loxP recombination work? Creating a stable genomic edit in zebrafish, or any other animal model system, is a complex process involving sophisticated techniques.
How is the Cre-Lox system used in genetic engineering?
The Cre-lox system is used as a genetic tool to control site specific recombination events in genomic DNA. This system has allowed researchers to manipulate a variety of genetically modified organisms to control gene expression, delete undesired DNA sequences and modify chromosome architecture.