Fah Knockout Animals as Models for Therapeutic Liver Repopulation

Area of Science:

• Hepatology
• Genetics
• Animal Models

Background:

• Fah deficiency causes liver disease, necessitating animal models for study.
• Murine models of Fah deficiency were initially developed for pathophysiologic and therapeutic research.
• Fah-positive hepatocytes exhibit a selective growth advantage in Fah-deficient livers, leading to organ repopulation.

Purpose of the Study:

• To explore the utility of Fah deficiency models in liver biology and regenerative medicine.
• To investigate the application of Fah-knockout mice for hepatic gene therapy and stem cell research.
• To evaluate the potential of Fah-deficient animals as platforms for generating human hepatocytes.

Main Methods:

• Development and utilization of various animal models for Fah deficiency, including mice, pigs, and rats.
• Employing immune-deficient Fah-knockout mice for repopulation with human hepatocytes to create chimeric models.
• Leveraging the selective growth advantage of Fah-positive hepatocytes for liver repopulation studies.

Main Results:

• Fah mutant mice are extensively used in liver stem cell and hepatic gene therapy research due to liver repopulation.
• Immune-deficient Fah-knockout mice engrafted with human hepatocytes serve as preclinical models for various diseases and therapies.
• The expansion of human hepatocytes in Fah-knockout mice supports the concept of using these models as bioreactors.

Conclusions:

• Fah deficiency models, especially mice, are invaluable tools for liver biology, stem cell research, and gene therapy.
• Chimeric mice with human livers derived from Fah-knockout models are critical for preclinical studies.
• Fah-deficient animals offer a promising avenue for developing 'living bioreactors' for hepatocyte production.