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Creation of X-linked Alport syndrome rat model with Col4a5 deficiency
Masumi Namba1, Tomoe Kobayashi1, Mayumi Kohno1
1Division of Molecular Genetics, Shigei Medical Research Institute, 2117 Yamada, Minami-ku, Okayama, 701-0202, Japan.
Abstract:
Alport syndrome is an inherited chronic human kidney disease, characterized by glomerular basement membrane abnormalities. This disease is caused by mutations in COL4A3, COL4A4, or COL4A5 gene. The knockout mice for Col4α3, Col4α4, and Col4α5 are developed and well characterized for the study of Alport syndrome. However, disease progression and effects of pharmacological therapy depend on the genetic variability. This model was reliable only to mouse. In this study, we created a novel Alport syndrome rat model utilizing the rGONAD technology, which generated rat with a deletion of the Col4α5 gene. Col4α5 deficient rats showed hematuria, proteinuria, high levels of BUN, Cre, and then died at 18 to 28 weeks of age (Hemizygous mutant males). Histological and ultrastructural analyses displayed the abnormalities including parietal cell hyperplasia, mesangial sclerosis, and interstitial fibrosis. Then, we demonstrated that α3/α4/α5 (IV) and α5/α5/α6 (IV) chains of type IV collagen disrupted in Col4α5 deficient rats. Thus, Col4α5 mutant rat is a reliable candidate for the Alport syndrome model for underlying the mechanism of kidney diseases and further identifying potential therapeutic targets for human renal diseases.
Insights
A new rat model for Alport syndrome was created using gene editing. This model accurately mimics human kidney disease progression, offering a better platform for studying Alport syndrome and developing therapies.
Area of Science:
- Nephrology
- Genetics
- Animal Models
Background:
- Alport syndrome is a genetic kidney disease caused by mutations in type IV collagen genes.
- Existing mouse models have limitations in reflecting human disease variability.
- There is a need for more accurate animal models for Alport syndrome research.
Purpose of the Study:
- To develop a novel Alport syndrome rat model using rGONAD technology.
- To characterize the Col4α5 gene deletion in rats and its phenotypic consequences.
- To validate the rat model for studying kidney disease mechanisms and therapeutic targets.
Main Methods:
- Utilized rGONAD technology for precise gene editing in rats.
- Generated rats with a specific deletion in the Col4α5 gene.
- Conducted histological, ultrastructural, and biochemical analyses to assess kidney damage and collagen chain disruption.
Main Results:
- Col4α5 deficient rats exhibited key Alport syndrome features: hematuria, proteinuria, elevated BUN and creatinine, and premature death.
- Histological analysis revealed glomerular and interstitial abnormalities, including mesangial sclerosis and fibrosis.
- Disruption of specific type IV collagen chains (α3/α4/α5 (IV) and α5/α5/α6 (IV)) was confirmed.
Conclusions:
- The novel Col4α5 mutant rat is a reliable model for Alport syndrome.
- This model recapitulates human kidney disease progression and collagen abnormalities.
- It serves as a valuable platform for investigating disease mechanisms and identifying therapeutic strategies for human renal diseases.
