Cloning, expression and bioactivity of BAFF from Petaurus breviceps

Area of Science:

• Immunology
• Molecular Biology
• Evolutionary Biology

Background:

• B-cell activating factor (BAFF) is vital for B-cell survival and maturation.
• BAFF belongs to the tumor necrosis factor (TNF) superfamily.
• Understanding BAFF diversity aids in comprehending immune system evolution.

Purpose of the Study:

• To clone and characterize the B-cell activating factor (BAFF) from the sugar glider (Petaurus breviceps).
• To investigate the functional role of sugar glider BAFF (PbBAFF) in B-cell proliferation.
• To explore the phylogenetic implications of PbBAFF in mammalian evolution.

Main Methods:

• Complementary DNA (cDNA) amplification using RT-PCR and RACE strategies.
• Analysis of the deduced amino acid sequence for conserved domains and features.
• Expression of recombinant PbsBAFF in Escherichia coli and in vitro functional assays.

Main Results:

• PbBAFF cDNA was successfully amplified and characterized, encoding a 287-amino acid protein.
• The deduced amino acid sequence shares high identity (88-92%) with mammalian BAFF homologs.
• Recombinant PbsBAFF stimulated the proliferation of human B-cells in vitro.
• Structural analysis revealed high similarity to human BAFF.

Conclusions:

• PbBAFF is the first BAFF identified in a marsupial, confirming its role in B-cell proliferation.
• The findings contribute to understanding marsupial immunology and mammalian evolutionary relationships.
• PbBAFF serves as a valuable tool for further immunological and evolutionary studies.