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Cell-specific RNA isoform remodeling in the aging mouse brain.

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This study reveals how RNA processing changes with age in the mouse brain, identifying new markers for cellular senescence in immune cells. These findings offer insights into brain aging and RNA metabolism.

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Area of Science:

  • Neuroscience
  • Genomics
  • Aging Research

Background:

  • Aging increases chronic disease risk and disrupts cellular RNA homeostasis.
  • Previous single-cell studies mapped RNA abundance but not complex processing changes like alternative splicing in the aging brain.
  • Understanding RNA processing changes is crucial for comprehending brain aging.

Purpose of the Study:

  • To investigate temporal changes in RNA transcription, processing, and alternative splicing in the aging mouse brain.
  • To characterize full-length RNA isoforms and their usage shifts across different brain cell types throughout the lifespan.
  • To identify molecular markers associated with aging and cellular senescence in the brain.

Main Methods:

  • Combined single-cell analysis with long-read nanopore sequencing.
  • Profiled transcriptomes from mice across a lifespan, from young adult to very old.
  • Utilized machine learning models to identify senescence markers.

Main Results:

  • Identified non-linear, cell-type-specific changes in isoform expression and usage, primarily driven by transcription start site selection.
  • Observed aging-associated isoform alterations affecting gene coding potential and polyadenylation sites.
  • Discovered a high prevalence of senescence in immune cells and identified isoform markers to distinguish senescent from normal immune cells.

Conclusions:

  • Aging significantly remodels RNA metabolism in a cell-type-specific manner within the mouse brain.
  • Full-length RNA isoform analysis provides a deeper understanding of gene expression regulation during aging.
  • The identified senescence markers in immune cells could aid in developing diagnostics or therapeutics for age-related conditions.