Isolation and Transcriptomic Profiling of Single Myofibers from Mice

Area of Science:

• Molecular Biology
• Muscle Physiology
• Genomics

Background:

• Skeletal muscle comprises diverse myofiber types with unique metabolic and structural characteristics.
• Current transcriptomic analysis of whole skeletal muscle averages gene expression, obscuring fiber-type-specific information.
• Myofibers are crucial for muscle contraction velocity and metabolism, necessitating fiber-specific gene expression data.

Purpose of the Study:

• To develop and validate a protocol for the isolation and transcriptomic analysis of single skeletal muscle myofibers.
• To enable the identification of myofiber-type-specific gene expression profiles.
• To facilitate the discovery of regulatory networks within distinct myofiber types.

Main Methods:

• Enzymatic dissociation of skeletal muscles (soleus and EDL demonstrated).
• Individual isolation and collection of myofibers.
• Separate purification of long and short RNAs from each myofiber.
• Library preparation for microarray or sequencing analysis.

Main Results:

• Successful isolation and transcriptomic analysis of single myofibers.
• Generation of myofiber-specific transcriptional profiles.
• Data is free from non-contractile cell transcripts, enabling precise analysis.

Conclusions:

• The described protocol allows for detailed, fiber-type-specific transcriptomic analysis of skeletal muscle.
• This approach is applicable to all skeletal muscles and various downstream analyses.
• Enables the identification of mRNA-miRNA-lncRNA regulatory networks specific to each myofiber type.