Related Experiment Video
Updated: Feb 28, 2026
09:29
Skeletal Muscle Gender Dimorphism from Proteomics
Published on: December 14, 2011
13.0K
MicroRNAs in Muscle: Characterizing the Powerlifter Phenotype
Randall F D'Souza1, Thomas Bjørnsen2, Nina Zeng1
1Liggins Institute, University of AucklandAuckland, New Zealand.
Frontiers in Physiology
|June 23, 2017
Summary
Powerlifters exhibit distinct microRNA (miR) expression profiles linked to greater muscle mass and strength. This unique miR signature accurately identifies powerlifters, offering insights into muscle adaptation mechanisms.
Area of Science:
- Molecular Biology
- Exercise Physiology
- Genetics
Background:
- Powerlifters display remarkable muscle adaptation and force generation capabilities.
- The underlying molecular mechanisms, particularly involving microRNAs (miRs), are not fully understood.
- Differences in miR expression may contribute to variations in muscle mass and function.
Purpose of the Study:
- To investigate differences in microRNA expression between national-level powerlifters and untrained individuals.
- To explore the correlation between miR abundance and key phenotypic traits like strength and muscle fiber size.
- To identify a potential miR signature for characterizing the powerlifter phenotype.
Main Methods:
- Muscle biopsies were collected from the vastus lateralis of powerlifters and controls.
- MicroRNA expression levels were analyzed using quantitative real-time PCR.
- Phenotypic data including strength, muscle fiber cross-sectional area (CSA), and satellite cell abundance were assessed.
Main Results:
- Powerlifters demonstrated significantly greater strength and larger muscle fiber CSA compared to controls.
- Twelve out of 17 analyzed miRs were differentially expressed between the groups.
- A five-miR signature (miR-126, -23b, -16, -23a, -15a) accurately (100%) distinguished powerlifters from controls.
- Eight miRs correlated with strength, fiber size, and satellite cell abundance.
Conclusions:
- Distinct microRNA expression profiles are associated with the powerlifter phenotype.
- Specific miRs play a role in regulating muscle mass and function in strength athletes.
- The identified miR signature provides a highly accurate method for categorizing individuals based on their training status and muscle adaptation.
Related Concept Videos
01:13Formation of Muscle Fibers from Myoblasts
6.2K
De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
6.2K
01:13Microscopic Anatomy of Skeletal Muscles
25.1K
Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
25.1K
01:27Exercise and Muscle Performance
2.8K
Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
2.8K