Gene expression changes in cerebellum induced by dietary restriction

Area of Science:

• Neuroscience
• Genomics
• Aging Research

Background:

• Dietary restriction (DR) is a known anti-aging intervention with neuroprotective properties.
• DR modulates metabolic and cytoprotective pathways through gene expression changes.
• The specific impact of DR on the cerebellar transcriptome was previously undefined.

Purpose of the Study:

• To investigate the effects of a 30% dietary restriction protocol on the cerebellar cortex transcriptome in young adult male mice.
• To identify differentially expressed genes and associated pathways under DR.
• To explore cell-type specific transcriptional changes in the cerebellum due to DR.

Main Methods:

• RNA sequencing (RNAseq) was employed to analyze the cerebellar cortex transcriptome.
• A classical 30% dietary restriction protocol was applied to young adult male mice.
• Differential gene expression analysis and cell-specific gene set enrichment analysis were performed.

Main Results:

• Approximately 5% of expressed genes in the cerebellum showed differential expression under DR.
• The majority of gene expression changes were subtle.
• Down-regulated genes were enriched in neuronal signaling pathways, while up-regulated genes were associated with cytoprotection and DNA repair.
• DR-down-regulated genes were significantly enriched in Purkinje cells, with no preferential down-regulation observed in granule cell-specific genes.

Conclusions:

• Dietary restriction induces a mild shift in the cerebellar transcriptome, favoring maintenance and repair processes.
• DR exerts cell-type specific effects within the cerebellar cortex.
• These findings contribute to understanding the molecular mechanisms of DR-induced neuroprotection.