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Updated: Aug 29, 2025

A Conflict Model of Reward-seeking Behavior in Male Rats
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Differential transcriptome profile underlying risky choice in a rat gambling task.

Myung Ji Kwak1, Wha Young Kim2, Seung-Hyun Jung3,4,5

  • 11Department of Medical Sciences, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul 03722, South Korea.

Journal of Behavioral Addictions
|September 12, 2022
PubMed
Summary

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Researchers identified distinct gene expression profiles in rat brains associated with risk-seeking behavior. These findings shed light on the genetic underpinnings of decision-making and potential links to psychiatric disorders.

Area of Science:

  • Neuroscience
  • Genetics
  • Behavioral Science

Background:

  • Accurate risk assessment is crucial for rational decision-making.
  • Altered decision-making processes are implicated in psychiatric disorders.
  • Genetic factors influencing risk-taking behavior remain largely uncharacterized.

Purpose of the Study:

  • To investigate differential gene expression in the medial prefrontal cortex (mPFC) and nucleus accumbens (NAc) during risk-based decision-making in rats.
  • To identify specific genes associated with risk-seeking versus risk-averse choices using a rodent gambling task (rGT).

Main Methods:

  • Rats were trained on a rodent version of the Iowa Gambling Task (rGT) to assess risk preferences.
  • Gene expression profiling was conducted using next-generation sequencing (NGS) on mPFC and NAc tissue from risk-seeking and risk-averse rats.
Keywords:
medial prefrontal cortexrat gambling taskrisky choicetranscriptome

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Main Results:

  • Significant differences in gene expression were observed between risk-seeking and risk-averse rats.
  • 477 genes were differentially expressed in the mPFC, with most downregulated.
  • 36 genes were differentially expressed in the NAc, with most downregulated.

Conclusions:

  • This study reveals key transcriptional differences in brain regions critical for decision-making.
  • Findings provide insights into the genetic mechanisms underlying risky choices in rats.