Aged mouse muscle showed fewer RNA isoform switches after acute overload
In a mouse model of acute muscle overload, aged muscle showed fewer or possibly delayed RNA isoform switches than adult muscle; some switches occurred without changes in overall gene expression. [1]
Automatic summary · not editorially reviewed
The key findings
The study used a mouse model of acute muscle mechanical overload and compared overloaded with sham muscle. [1]
Short-read sequencing found hundreds of genes with isoform switching in adult overloaded muscle but only 37 in aged overloaded muscle. [1]
Long-read sequencing found 19 genes with true isoform switching in adult overloaded muscle and none in aged overloaded muscle. [1]
The source at a glance
- Study type / format
- Abstract of a preclinical mouse study using short-read and long-read RNA sequencing.
- Population / context
- Adult and aged mouse skeletal muscle in a model of acute mechanical overload, compared with sham.
- Summary based on
- Study abstract
- Original publication
- October 1, 2026
Aged mouse muscle and overload response
The researchers asked whether aging disrupts how RNA splicing responds to involuntary mechanical loading of muscle. They used a mouse model of acute muscle mechanical overload and compared overloaded muscle with sham-treated muscle. Their hypothesis was that aging disrupts the splicing response to this loading. The abstract describes aged muscle as having a reduced ability to adapt to hypertrophic stimuli, alongside dysregulation at several molecular levels.
Supporting source [1]
Fewer isoform switches in aged overloaded muscle
Short-read sequencing found hundreds of genes with isoform switching events in adult overloaded muscle relative to sham, but only 37 in aged overloaded muscle. Long-read sequencing found 19 genes with true isoform switching in adult overloaded muscle, including Cacnb1, Naca and Psap, and none in aged overloaded muscle. A subset of genes showed significant isoform switching without corresponding changes in overall gene expression, suggesting post-transcriptional regulation in response to overload.
Supporting source [1]
Abstract-only scope of the mouse sequencing study
This explainer is based only on the abstract; the full text was not reviewed. The abstract reports a murine model of acute overload and sequencing results, but gives no sample sizes, follow-up times or effect sizes. The authors describe aged muscle as having a reduced or possibly delayed potential for isoform switching. These are molecular findings in mice, not evidence of human lifespan or muscle-function benefits.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. No sample sizes, follow-up times or effect sizes are reported. Findings are molecular results in mice, not human outcomes.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Koopmans PJ, Stokes AL, Nelson CE, Wen Y, Ismaeel A, Murach KA. · europepmc.org · October 1, 2026