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Updated: Mar 2, 2026
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Trace Fear Conditioning in Mice
Published on: March 20, 2014
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The microbiome regulates amygdala-dependent fear recall.
A E Hoban1,2, R M Stilling1,2, G Moloney2
1APC Microbiome Institute, University College Cork, Cork, Ireland.
Molecular Psychiatry
|May 17, 2017
Summary
The host microbiome is crucial for normal fear memory. Germ-free mice show altered amygdala gene expression and impaired fear responses, highlighting the microbiome-gut-brain axis in behavior.
Area of Science:
- Neuroscience
- Microbiology
- Behavioral Science
Background:
- The amygdala processes fear and anxiety.
- The microbiome-gut-brain axis influences stress responses.
- The microbiome's role in fear behavior is not well understood.
Purpose of the Study:
- Investigate the microbiome's impact on amygdala-dependent fear behavior.
- Analyze transcriptional changes in the amygdala of germ-free mice.
Main Methods:
- Used cued fear conditioning paradigm in germ-free (GF) and conventionally raised (CON) mice.
- Performed genome-wide transcriptome profiling of the amygdala.
- Assessed behavioral readouts and neuronal gene expression.
Main Results:
- GF mice exhibited reduced freezing during fear memory retention.
- GF mice showed altered amygdala gene expression, including increased immediate-early genes.
- Colonization (ex-GF) restored normal behavior compared to CON mice.
Conclusions:
- The host microbiome is essential for appropriate amygdala-dependent memory retention.
- GF animals display unique transcriptional responses potentially due to neuronal hyperactivity.
- This study establishes the microbiome's critical role in fear behavior regulation.
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