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Molecular cloning and expression analysis of pig CD79alpha
Suk Jun Lee1, Sang Joon Kim, Chung-Gyu Park
1Division of Biotechnology, School of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea.
Veterinary Immunology and Immunopathology
|July 1, 2008
Summary
Researchers cloned pig CD79a cDNA, revealing conserved signaling motifs crucial for B cell receptor function. Pig CD79alpha is primarily expressed in lymphoid tissues, aiding in B cell signaling research.
Area of Science:
- Immunology
- Molecular Biology
- Veterinary Science
Background:
- The CD79alpha (immunoglobulin alpha, Igalpha) protein is a key component of the B cell receptor (BCR) complex.
- CD79alpha heterodimerizes with CD79beta (Igbeta) to mediate B cell signaling pathways.
- Understanding CD79alpha in pigs is vital for comparative immunology and disease research.
Purpose of the Study:
- To clone and characterize the pig CD79a cDNA sequence.
- To investigate the tissue distribution and expression patterns of pig CD79a mRNA.
- To confirm the utility of a human CD79alpha antibody for detecting pig CD79alpha.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) for cDNA cloning and mRNA detection.
- Bioinformatic analysis of the deduced amino acid sequence and comparison with mammalian orthologs.
- Flow cytometry and immunohistochemistry using a human CD79alpha antibody on pig tissues.
Main Results:
- The complete cDNA sequence of pig Cd79a was determined, encoding 223 amino acids with significant homology to mammalian CD79alpha.
- Conserved transmembrane and cytoplasmic domains, including the immunoreceptor tyrosine-based activation motif (ITAM), were identified.
- Pig Cd79a mRNA expression was highest in the mesenteric lymph node and spleen, with lower levels in other lymphoid and non-lymphoid tissues.
- A human CD79alpha antibody successfully detected pig CD79alpha on B cells and in spleen tissue, localized to the follicular mantle zone.
Conclusions:
- The cloned pig CD79a sequence provides a foundation for further immunological studies in pigs.
- The conserved structure suggests similar functional roles in B cell signaling across mammalian species.
- The expression patterns highlight the importance of lymphoid organs in pig CD79alpha function.
- The validated antibody offers a tool for future research into pig infectious diseases and neoplasms involving B cells.
