The Discovery of Cre Mice
The discovery of Cre mice can be traced back to the early 1980s, when scientists began to experiment with a DNA recombination system called Cre.
Cre is an enzyme that recognizes specific DNA sequences (loxP) and causes them to rearrange. This system allowed scientists to selectively control the expression of genes in certain cells or tissues, leading to the development of genetically engineered mice with specific gene mutations.
Development of Cre Mice
The first Cre mice were developed in the early 1990s by a team of researchers led by Dr. Jamey Marth at the Howard Hughes Medical Institute. The team created mice with a targeted deletion of a gene called fucosyltransferase 8 (Fut8), which is involved in the production of glycans (sugar molecules) on cell surfaces. The resulting mice had a reduced ability to produce glycans, leading to defects in cell adhesion and immune responses.
Advancements
Since the development of the first Cre mice, researchers have continued to improve and refine the technique. One major advancement was the use of inducible Cre systems (usually CreERT2 approach), which allow for greater control over the timing and location of gene expression. Another was the generalization of the “floxed” approach for a large number of target genes in the genome. “floxed” mice, which have loxP sequences flanking a specific gene of interest, allow for precise deletion or activation of that gene.
Gene Editing with Cre and FLP Recombinase Systems
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Impact of Cre Mice
The impact of Cre mice on biomedical research has been significant. They have been used to study a wide range of diseases and conditions, including cancer, heart disease, diabetes, and neurological disorders. By selectively deleting or activating specific genes in certain cells or tissues, at a specific time if needed, researchers have been able to better understand the underlying mechanisms of these diseases and develop new treatments.
The use of Cre mice has significantly advanced the field of genetic engineering. Through their precise control of gene expression, they have enabled researchers to create models that closely mimic diseases in humans and allowed for greater understanding of the underlying mechanisms involved. Additionally, Cre mice have been used to study a variety of cellular processes, such as development, differentiation, and apoptosis. This knowledge can help scientists develop treatments for a wide range of conditions. Finally, by introducing specific mutations into Cre mice, researchers are able to identify novel therapeutic targets and develop new drugs and therapies.
Using Cre Mice
Numerous resources are readily available to the scientific community, from floxed genes to cell type-specific cre and creERT2 zoos, For beginners, a good understanding of the unexpected complexities and technical limitations that can confound the interpretation of Cre results is available online. We also recommend reading this article by Linder et al. for validation tips and examples of pitfalls.
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