TP63 Transcripts Play Opposite Roles in Chicken Skeletal Muscle Differentiation

Area of Science:

• Molecular Biology
• Developmental Biology
• Muscle Biology

Background:

• Tumor protein 63 (TP63) is crucial for embryonic development.
• TP63 isoforms regulate various cellular processes, but their specific roles in muscle differentiation are unclear.

Purpose of the Study:

• To investigate the distinct functions of TAp63α and ΔNp63α isoforms of TP63 in chicken skeletal muscle development.
• To identify the downstream targets and pathways regulated by these TP63 isoforms during myogenesis.

Main Methods:

• Expression analysis of TAp63α and ΔNp63α in chicken skeletal muscle and during myoblast differentiation.
• Isoform-specific overexpression assays in myoblasts.
• RNA-sequencing and bioinformatics analysis to identify differentially expressed genes (DEGs).
• Experimental verification of identified downstream targets.

Main Results:

• TAp63α and ΔNp63α exhibit distinct expression patterns and opposing functions in skeletal muscle development.
• TAp63α overexpression inhibits proliferation, induces cell cycle arrest, and enhances myoblast differentiation.
• ΔNp63α overexpression inhibits myoblast differentiation without affecting proliferation.
• RNA-seq identified distinct sets of downstream genes regulated by TAp63α (cell cycle pathway) and ΔNp63α (muscle system process, muscle contraction, myopathy).

Conclusions:

• TP63 isoforms TAp63α and ΔNp63α play critical, opposing roles in skeletal muscle development and myoblast differentiation.
• TAp63α promotes differentiation by regulating cell cycle, while ΔNp63α inhibits differentiation, impacting muscle-specific processes.
• This study highlights the complex, dual functionality of a single gene (TP63) within a specific biological process.