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In-vitro Mutagenesis

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.

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Inducible Avp knockout mouse line.

Shaza Khan^1,2, Lihe Chen¹, Chung-Lin Chou¹

¹Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States.

American Journal of Physiology. Renal Physiology

|October 6, 2025

Summary

This summary is machine-generated.

Researchers developed a new inducible knockout mouse model for arginine vasopressin (AVP) gene deletion. This viable and fertile mouse model allows for precise study of AVP

Keywords:

aquaporin-2 collecting duct kidney tamoxifen

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Area of Science:

Physiology
Genetics
Endocrinology

Background:

Arginine vasopressin (AVP) is crucial for water balance.
Brattleboro rats, previously used for AVP studies, are difficult to breed.
A new model is needed to study AVP's diverse functions.

Purpose of the Study:

To create a tamoxifen-inducible knockout mouse model for the arginine vasopressin (Avp) gene.
To validate the model's efficacy in studying AVP deficiency.
To provide a valuable tool for research on water balance and related diseases.

Main Methods:

CRISPR/Cas9 technology to insert loxP sites into the Avp gene.
Breeding with Cre-expressing mice to create conditional knockout mice.
Tamoxifen administration to induce gene deletion and subsequent analysis (Sanger sequencing, RNA-seq).

Main Results:

Successfully generated viable and fertile inducible Avp knockout mice.
Tamoxifen induction led to significant AVP deficiency, confirmed by decreased urine osmolality.
Reduced aquaporin 2 (AQP2) expression observed, with normal kidney structure.

Conclusions:

An inducible Avp knockout mouse model has been successfully developed and shared.
This model offers a valuable resource for studying water balance regulation.
The model is applicable to research on polycystic kidney disease and AVP's neural, vascular, and metabolic roles.