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Updated: Jun 21, 2025
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A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging
Published on: July 14, 2016
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Phenotypic quantification of Nphs1-deficient mice.
Ronen Schneider1, Bshara Mansour1, Caroline M Kolvenbach1,2
1Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, USA.
Journal of Nephrology
|July 14, 2024
Summary
Steroid-resistant nephrotic syndrome (SRNS) is a severe kidney disease. This study developed a nephrin-deficient mouse model, revealing key kidney defects and paving the way for gene replacement therapy.
Area of Science:
- Nephrology
- Genetics
- Molecular Biology
Background:
- Steroid-resistant nephrotic syndrome (SRNS) is a leading cause of pediatric chronic kidney disease.
- Congenital nephrotic syndrome Finnish type (CNSF), a severe SRNS form, results from NPHS1 gene variants encoding nephrin.
- Developing targeted therapies for rare monogenic causes of SRNS is challenging, highlighting the potential of gene replacement therapy (GRT).
Purpose of the Study:
- To establish and validate a conditional Nphs1 knockout mouse model for phenotypic assessment.
- To provide a foundation for future in vivo gene replacement studies in SRNS.
Main Methods:
- Generated podocyte-specific nephrin-deficient mice (Nphs1fl/fl NPHS2-Cre+) by breeding floxed Nphs1 mice with podocin-Cre mice.
- Assessed survival rates, kidney histology (light and transmission electron microscopy), and proteinuria (urine albumin-to-creatinine ratio).
Main Results:
- Nephrin-deficient mice exhibited significantly reduced median survival (P5) compared to controls.
- Histological analysis revealed increased renal-tubular microcysts and reduced podocyte foot process density.
- Quantified significantly elevated proteinuria (UACR) in nephrin-deficient mice.
Conclusions:
- This study provides the first comprehensive kidney phenotype description of a nephrin-deficient mouse model.
- The characterized model serves as a crucial platform for developing and testing gene replacement therapies for NPHS1-associated nephrotic syndromes.
