What does tamoxifen do in Cre?

The main inducer of these genetic modifications is tamoxifen, which enables enzymatic activity of Cre-mutated estrogen receptor (Cre-ERTM) fusion protein, and therefore knowledge of tamoxifen administration, metabolism and degradation in a living organism is of great importance.

Why is tamoxifen used in mice?

However, in laboratory mice, tamoxifen sustains a completely different function: it is used in genetic engineering to activate genes through a cascade of events.

How do you give mice tamoxifen?

To deliver tamoxifen in drinking water, dissolve it in pure ethanol (100 mg tamoxifen in 1 mL of ethanol) and then dilute it 100- to 200-fold in distilled water (to a final concentration of 1–0.5 mg/mL). Mice drink an average of 4–5 mL of water per day.

What does tamoxifen dissolve in?

Tamoxifen is soluble in chloroform at 50 mg/ml and yields a clear, colorless to faint yellow solution. It is also soluble in methanol, ethanol, 2-propanol and propylene glycol. Stock solutions of tamoxifen can also be prepared in DMSO at 10 mM.

What is UBC Cre?

Also Known As:UBC-Cre-ERT2 When these UBC-Cre-ERT2 mice are bred with mice containing a loxP-flanked sequence of interest, tamoxifen-inducible, Cre-mediated recombination will result in deletion of the floxed sequences in widespread cells/tissues. In Goodwin et al. 2019 Genome Res.

How does inducible Cre work?

Inducible Cre activation is achieved using CreER (estrogen receptor) variant, which is only activated after delivery of tamoxifen. This is done through the fusion of a mutated ligand binding domain of the estrogen receptor to the Cre recombinase, resulting in Cre becoming specifically activated by tamoxifen.

What is a Cre mouse?

A Cre mouse contains a Cre recombinase transgene under the direction of a tissue-specific promoter; a loxP mouse contains two loxP sites that flank a genomic segment of interest, the “floxed” locus. Typically, Cre and loxP mice are produced by using transgenic technology (Nagy 2000).

What does CRE inducible mean?

Can tamoxifen be injected?

Administer tamoxifen via intraperitoneal injection (using an ACUC approved injection procedure) once every 24 hours for a total of 5 consecutive days. As a safeguard, sanitize injection site with 70% ethanol prior to injection.