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Mouse Model Strategies & Allele Types

Inducible Allele (Cre-ER Systems)

A genetically engineered version of a gene that can be activated or deleted at a specific time by an external stimulus. The most widely used approach is the Cre-ER system, allowing researchers to precisely control the timing of gene modification in vivo.

Overview

Traditional knockout or knockin models provide powerful insights into gene function, but their effects are fixed from conception. Inducible alleles solve these problems by putting researchers in control. By triggering genetic modification when they choose, scientists can study gene function in adult tissues, dissect disease progression over time, and model therapeutic interventions.

Frequently Asked Questions

How precise is temporal control with Cre-ER?

Temporal control with Cre-ER is highly precise. Recombination typically occurs within 24 to 72 hours after tamoxifen administration, and timing can be adjusted by dosage and delivery method.

Can inducible alleles be combined with tissue-specific promoters?

Yes. Cre-ER can be driven by tissue-specific promoters, allowing both spatial and temporal control in a single model.

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Related Terms

Inducible Cre (Cre-ERT2 / Tamoxifen)

A system that fuses Cre recombinase to a modified estrogen-receptor ligand-binding domain (ERT2), confining it to the cytoplasm until activation by tamoxifen, thus providing temporal control of recombination.

Conditional Knockout (cKO) Mouse Models

A genetically engineered mouse in which a specific gene can be selectively inactivated in chosen tissues, cell types, or developmental stages, enabling precise studies of gene function while avoiding embryonic lethality or systemic effects.

Temporal Control (Induction Windows, Dosing)

The activation or deactivation of a genetic modification at a specific time or during a defined developmental window. This strategy allows researchers to study gene function dynamically and distinguish developmental effects from later ones.

More in Mouse Model Strategies & Allele Types

Knockout (KO) Mouse ModelsConditional Knockout (cKO) Mouse ModelsConventional (Constitutive) Knockout Mouse ModelsKnockin (KI) Mouse ModelsHumanized Mouse Models
Hypomorphic / Null AlleleView All TermsInducible Cre (Cre-ERT2 / Tamoxifen)