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Related Concept Videos

Formation of Muscle Fibers from Myoblasts01:13

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Related Experiment Video

Updated: Apr 15, 2026

Author Spotlight: Deciphering the Cellular Mysteries of Intermuscular Adipose Tissue in Humans
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Single-Nucleus RNA Sequencing Reveals Muscle Fiber Cell Heterogeneity During Human Skeletal Muscle Aging.

Caixia Gong1,2, Li Wu1,2, Ange Wang1

  • 1Department of Geriatrics, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.

Aging Cell
|April 14, 2026
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Summary

Human muscle aging leads to fiber type changes and fatty infiltration, driven by fibro/adipogenic progenitors (FAPs). This study maps these cellular shifts, revealing new therapeutic targets for age-related muscle decline.

Keywords:
denervationfatty infiltrationmuscle fiber typessingle‐nucleus RNA sequencingskeletal muscle aging

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Area of Science:

  • Skeletal muscle biology
  • Aging research
  • Molecular genetics

Background:

  • Skeletal muscle mass and function decline with age.
  • Cell-type-specific transcriptional and signaling changes in aging human muscle are not fully understood.

Purpose of the Study:

  • To create a detailed transcriptional atlas of aging human skeletal muscle.
  • To identify cellular mechanisms driving muscle aging and functional decline.

Main Methods:

  • Single-nucleus RNA sequencing (snRNA-seq) of vastus lateralis muscle from adult and elderly males.
  • Analysis of cellular census, transcriptional states, and intercellular communication.

Main Results:

  • Identified a shift in myofiber transcriptional states from "young" to dysfunctional "old" states, with emergence of hybrid fibers.
  • Linked RUNX1+ hybrid fibers to denervation and SAA1+ hybrid fibers to fatty infiltration by fibro/adipogenic progenitors (FAPs).
  • Revealed altered aged microenvironment with impaired stem cell metabolism, immune function, and vascular health, alongside enhanced FAP-to-myofiber signaling.

Conclusions:

  • Human muscle aging involves profound myofiber reorganization, denervation, and FAP-driven fatty infiltration.
  • These cellular changes contribute significantly to age-related functional decline.
  • The study provides a roadmap for identifying therapeutic targets for muscle aging.