Altered ADAR 2 equilibrium and 5HT(2C) R editing in the prefrontal cortex of ADAR 2 transgenic mice

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Serotonin signaling is crucial for mood regulation and is implicated in affective disorders.
• RNA editing, specifically by ADAR2, modifies the serotonin 2C receptor (5HT2CR) transcript.
• ADAR2 transgenic mice exhibit enhanced behavioral despair, suggesting a link to serotonin signaling.

Purpose of the Study:

• To investigate how altered ADAR2 expression impacts 5HT2CR RNA editing and function in the prefrontal cortex.
• To determine the effect of perturbed ADAR2 equilibrium on downstream signaling pathways, such as ERK.

Main Methods:

• Comparison of ADAR2 transgenic mice with naive controls.
• Analysis of ADAR2 expression levels and RNA editing status of the 5HT2CR transcript.
• Assessment of 5HT2CR amino acid isoform distribution and basal extracellular signal-regulated kinase (ERK) signaling.

Main Results:

• ADAR2 transgenic mice showed increased ADAR2 expression and altered 5HT2CR RNA editing.
• A significant shift in 5HT2CR amino acid isoforms was observed, with increased valine and decreased isoleucine variants.
• Dysregulated 5HT2CR editing correlated with reduced basal ERK signaling.

Conclusions:

• Perturbed ADAR2 equilibrium in ADAR2 transgenic mice alters 5HT2CR editing and function.
• Altered 5HT2CR function may contribute to the enhanced depression-like behavior observed in these mice.
• ADAR2 dysregulation is implicated as a potential factor in affective disorders.