Molecular characterization of Tob1 in muscle development in pigs.

Area of Science:

• Animal Genetics
• Developmental Biology
• Molecular Biology

Background:

• Cell proliferation is crucial for myogenesis.
• Tob1 is an anti-proliferative protein from the Tob/BTG family.
• Previous studies indicated Tob1's differential expression in prenatal skeletal muscle development.

Purpose of the Study:

• To isolate and characterize the swine Tob1 gene.
• To investigate Tob1's chromosome assignment, subcellular localization, and expression patterns in prenatal and postnatal skeletal muscle development.
• To explore Tob1's potential role in myogenesis and proliferation differences between Landrace and Tongcheng pigs.

Main Methods:

• Gene isolation and characterization.
• Chromosome mapping (SSC12).
• Subcellular localization studies in PK15 cells.
• Quantitative expression analysis in Landrace and Tongcheng pigs at different prenatal stages (33, 65, 90 dpc).
• Postnatal expression analysis and C2C12 cell differentiation studies.

Main Results:

• The swine Tob1 gene was mapped to chromosome 12 (SSC12).
• Tob1 protein localized to both nucleus and cytoplasm.
• Prenatal expression patterns differed between Landrace (peak at 65 dpc) and Tongcheng pigs (peak at 90 dpc), suggesting breed-specific proliferation differences.
• Tob1 expression increased with age during postnatal development, correlating with decreased myoblast proliferation potential.
• Tob1 was highly expressed in adult Wuzhishan miniature pig skeletal muscle and increased during C2C12 cell differentiation.

Conclusions:

• Tob1 exhibits dynamic expression during swine skeletal muscle development.
• The differential expression patterns suggest Tob1's involvement in regulating myogenesis and proliferation.
• Tob1 may play a significant role in skeletal muscle development and potentially influences breed-specific growth characteristics.