Zebrafish Danio rerio myotomal muscle structure and growth from a spatial transcriptomics perspective

Area of Science:

• Comparative anatomy
• Developmental biology
• Genomics

Background:

• Fish muscle structure and growth differ significantly from mammals.
• Understanding fish myotomal muscle organization is crucial for developmental and comparative studies.

Purpose of the Study:

• To map the spatial organization of zebrafish myotomal muscle using transcriptomic data.
• To identify regions associated with muscle growth, hyperplasia, and larval muscle similarities in adults.

Main Methods:

• Spatial transcriptomics on adult and larval zebrafish myotomal muscle sections.
• Analysis of gene expression patterns to delineate muscle regions.
• Comparative analysis between adult and larval muscle transcriptomic data.

Main Results:

• Zebrafish adult muscles were segmented into eight distinct regions based on spatial gene expression.
• Slow, intermediate, and fast muscle fiber types were spatially localized.
• Specific adult muscle regions mirrored larval muscle characteristics, showing active myogenesis and hyperplasia gene expression.

Conclusions:

• This study provides the first spatial transcriptomic map of fish myotomal muscle.
• Identified regions highlight conserved developmental processes and distinct muscle growth mechanisms in fish.
• Spatial transcriptomics is a powerful tool for dissecting complex tissue structures and developmental patterns in aquatic models.