A novel Atg5-shRNA mouse model enables temporal control of Autophagy in vivo

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Macroautophagy/autophagy is a vital cellular process implicated in various diseases, including aging.
• Existing mouse models for studying autophagy have limitations, such as perinatal lethality or neurotoxicity, hindering in vivo research.
• Developing models for dynamic and tissue-specific autophagy modulation is crucial for understanding its complex roles.

Purpose of the Study:

• To create an inducible mouse model for dynamically inhibiting autophagy in vivo.
• To investigate the consequences of autophagy inhibition in a conditional manner, avoiding systemic lethal phenotypes.
• To explore the potential side effects of systemic anti-autophagy therapies.

Main Methods:

• Development of an inducible shRNA mouse model targeting the autophagy gene Atg5 (ATG5i mice).
• Assessment of autophagy inhibition and associated phenotypes in various tissues.
• Evaluation of the effects of autophagy restoration in the liver.

Main Results:

• The ATG5i mouse model allows for dynamic and conditional inhibition of autophagy without causing lethal phenotypes.
• ATG5i mice exhibit phenotypes consistent with previously described tissue-specific autophagy knockouts.
• Restoring autophagy in the liver ameliorates pathologies but leads to the development of hepatic fibrosis.

Conclusions:

• The ATG5i mouse model provides a valuable tool for studying autophagy in vivo.
• Systemic inhibition of autophagy can have detrimental side effects, such as hepatic fibrosis.
• Careful consideration of potential adverse effects is necessary when developing systemic anti-autophagy therapies.