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Using the E1A Minigene Tool to Study mRNA Splicing Changes
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A functionally integrated cross-tissue alternative splicing program during short-term calorie restriction.

Daniel P Phillips1, Sharon E Mitchell1, Davina Derous1

  • 1School of Biological Sciences, University of Aberdeen, Aberdeen AB24 2TZ, Scotland, United Kingdom.

Life Metabolism
|April 27, 2026
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Summary
This summary is machine-generated.

Calorie restriction (CR) impacts alternative splicing (AS) across multiple tissues in mice. This study reveals a coordinated AS response to CR, influencing key cellular processes independently of gene expression changes.

Keywords:
RNAagingalternative splicingcalorie restriction

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Area of Science:

  • Molecular Biology
  • Genomics
  • Aging Research

Background:

  • Alternative splicing (AS) produces diverse RNA molecules from a single pre-mRNA.
  • Calorie restriction (CR), a sustained calorie deficit without malnutrition, is known to extend health and lifespan.
  • AS dysregulation is observed in aging, but CR appears to mitigate this, suggesting AS involvement in CR's benefits.

Purpose of the Study:

  • To investigate the hypothesis that AS plays a role in the CR response.
  • To characterize the tissue specificity of AS changes induced by CR.
  • To explore the functional integration of AS across different tissues under CR.

Main Methods:

  • Male C57BL/6 mice were subjected to 3 months of graded CR (0-40% in 10% increments).
  • RNA sequencing was performed on six tissues: epididymal white adipose tissue (eWAT), liver, hypothalamus, gastrocnemius muscle, testes, and stomach.
  • Differential AS (DAS) analysis was conducted to identify changes in splicing patterns.

Main Results:

  • The number of differentially expressed splicing regulators increased with CR levels, particularly in muscle, eWAT, and liver.
  • The total number of DAS genes also increased with CR and was predominantly tissue-specific.
  • Most DAS genes were not differentially expressed at the transcript level, indicating splicing changes independent of expression.
  • DAS was functionally integrated across tissues, with overrepresented processes including mitochondria, oxidative phosphorylation, transcription, translation, and protein/RNA quality control.

Conclusions:

  • Short-term CR induces a functionally integrated, cross-tissue AS response in mice.
  • This AS response to CR is largely independent of changes in gene expression.
  • AS represents a significant mechanism through which CR exerts its beneficial effects on health and lifespan.