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Genetic Manipulation of the Renin-Angiotensin System Using Cre-loxP-Recombinase
1Department of Internal Medicine and Physiology and Biophysics, The University of Iowa College of Medicine, Iowa City, IA.
Methods in Molecular Medicine
|February 19, 2011
Summary
Gene knockout studies reveal critical roles for the renin-angiotensin system (RAS) in kidney development. Complete RAS gene deficiencies in mice lead to severe renal failure and early death, highlighting Angiotensin II
Area of Science:
- Genetics
- Molecular Biology
- Physiology
Background:
- Gene targeting in embryonic stem cells enables the study of gene function through germ line mutations.
- The renin-angiotensin system (RAS) plays a crucial role in physiological regulation.
- Previous studies have generated knockout mice for various RAS genes.
Purpose of the Study:
- To investigate the limitations of gene knockout technology in studying the RAS.
- To understand the role of the RAS in kidney development and survival.
Main Methods:
- Systemic deletion (knockout) of specific renin-angiotensin system genes in mice.
- Phenotypic analysis of knockout mice, focusing on renal morphology and mortality.
- Examination of genetic background effects on knockout phenotypes.
Main Results:
- Systemic deletion of angiotensinogen (Agt-/-), angiotensin-converting enzyme (ACE-/-), and combined angiotensin receptor 1A/1B (At1a-/-, At1b-/-) deficient mice exhibit severe renal lesions and mortality before weaning.
- Mice deficient in At1a alone are phenotypically normal on mixed backgrounds but show renal issues on pure backgrounds, indicating genetic control.
- Angiotensin II appears essential for neonatal kidney development.
Conclusions:
- Complete deficiency in RAS gene function leads to lethal renal failure in early life.
- The renin-angiotensin system is indispensable for normal kidney development.
- Genetic background influences the phenotype of RAS knockout mice, suggesting complex genetic regulation.
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