Mouse models as tools to explore cytidine-to-uridine RNA editing

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• RNA editing alters genomic information, enhancing genetic plasticity and protein diversity.
• Two main classes exist: C-to-U and A-to-I enzymatic deamination in nuclei.
• Apolipoprotein B (apoB) RNA editing exemplifies C-to-U editing, crucial for lipid metabolism.

Purpose of the Study:

• To elucidate the mechanism and regulation of C-to-U RNA editing, focusing on apolipoprotein B (apoB).
• To understand how apoB RNA editing generates distinct apoB100 and apoB48 isoforms.
• To explore the role of regulatory factors and rodent models in studying apoB RNA editing and lipid metabolism.

Main Methods:

• Characterization of the apoB RNA editing holoenzyme, including apobec-1 and ACF.
• Analysis of apoB RNA editing in rodent models.
• Utilizing transgenic and gene knockout approaches in mice to study gain and loss of function.

Main Results:

• The apoB RNA editing holoenzyme, comprising apobec-1 and ACF, mediates C-to-U editing.
• This process generates two functionally distinct apoB isoforms (apoB100 and apoB48) from a single transcript.
• Rodent models and genetic manipulation provide insights into regulatory factors and lipid metabolism.

Conclusions:

• C-to-U RNA editing of apoB is a key regulatory mechanism for lipid transport and metabolism.
• Environmental and metabolic factors influence apoB RNA editing.
• Rodent models are valuable for investigating RNA editing and its physiological impact.