Transgenic pig carrying green fluorescent proteasomes

Area of Science:

• Cell Biology
• Reproductive Biology
• Biochemistry

Background:

• The ubiquitin-proteasome system regulates crucial cellular processes, including fertilization.
• Proteasomes are found in spermatozoa, but their interactions with sperm components are poorly understood.

Purpose of the Study:

• To generate a transgenic boar model expressing a fluorescently tagged proteasomal subunit (PSMA1-GFP).
• To investigate the incorporation and interactions of PSMA1-GFP within boar spermatozoa.

Main Methods:

• Generation of a transgenic boar expressing PSMA1-GFP.
• Epifluorescence and immunofluorescence imaging to detect PSMA1-GFP localization.
• Western blotting to confirm fusion protein presence.
• In vitro fertilization and mating to assess fertility.
• Immunoprecipitation and proteomic analysis to identify interacting proteins.

Main Results:

• PSMA1-GFP was successfully expressed and localized to the sperm acrosome in transgenic boars.
• Western blotting confirmed the presence of the 57 kDa PSMA1-GFP fusion protein.
• Transgenic boars exhibited normal fertility, producing transgenic offspring.
• Proteomic analysis identified interactions between PSMA1-GFP and acrosomal membrane proteins (e.g., MFGE8) and other proteasomal subunits.

Conclusions:

• The PSMA1-GFP fusion protein is incorporated into functional sperm proteasomes in transgenic boars.
• This model provides a valuable tool for studying sperm proteasome function during fertilization.
• Identified interacting proteins may regulate proteasome activity or serve as substrates during fertilization.