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Updated: May 16, 2025
Inducing Cre-lox Recombination in Mouse Cerebral Cortex Through In Utero Electroporation
Published on: November 17, 2017
Metabolic phenotypes in a Lyz2Cre recombinase mouse model
S M Niazur Rahman1, Justin Hou Ming Yung1, Allen Volchuk2
1Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada.
Abstract:
The Cre-Lox system is essential in biomedical research for precise gene deletion in specific cell types, crucial for understanding genetic roles in disease. Although generally considered non-detrimental, Cre recombinase expression has been associated with potential adverse effects, including Cre toxicity, ectopic expression, and disruption of endogenous genes. We investigated the role of macrophage nucleotide-binding oligomerization domain (Nod1) in obesity-associated diabetes using myeloid-specific Nod1-knockout mice (Nod1 floxed crossed with Lyz2Cre). Our study examined Lyz2Cre as well as floxed control mice separately, unlike most research. Results indicated that Lyz2Cre expression alone impacts glucose metabolism, challenging the notion that Cre expression is harmless. This finding highlights the critical importance of including Cre-only controls in studies using floxed alleles to generate conditional knockout mouse models in order to ensure robust and accurate conclusions in molecular research.
Insights
Cre recombinase expression can affect glucose metabolism, even without gene deletion. This study emphasizes the need for Cre-only controls in conditional knockout mouse models to ensure accurate research findings.
Area of Science:
- Molecular Biology
- Immunology
- Metabolic Research
Background:
- The Cre-lox system enables precise gene deletion in specific cell types for disease research.
- Cre recombinase expression is generally considered safe but may cause toxicity or unintended gene disruption.
Purpose of the Study:
- To investigate the role of macrophage nucleotide-binding oligomerization domain (Nod1) in obesity-associated diabetes.
- To evaluate the impact of Cre recombinase expression alone on glucose metabolism.
Main Methods:
- Utilized myeloid-specific Nod1-knockout mice (Nod1 floxed crossed with Lyz2Cre).
- Separately analyzed Lyz2Cre and floxed control mice to isolate Cre effects.
Main Results:
- Lyz2Cre expression alone significantly impacted glucose metabolism.
- This finding challenges the assumption that Cre expression is benign in conditional knockout studies.
Conclusions:
- Cre-only control groups are essential for validating results from floxed allele-based conditional knockout mouse models.
- Ensuring Cre-only controls is critical for robust and accurate conclusions in molecular and genetic research.
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