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Porcine SPLUNC1: molecular cloning, characterization and expression analysis.
Knud Larsen1, Lone Bruhn Madsen, Christian Bendixen
1Department of Animal Breeding and Genetics, Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark. Knud.Larsen@agrsci.dk
Biochimica Et Biophysica Acta
|March 22, 2005
Summary
Researchers cloned and analyzed the porcine SPLUNC1, a protein involved in the innate immune system. Its high expression in the airways suggests a role in respiratory health and airborne disease resistance in pigs.
Area of Science:
- Immunology
- Molecular Biology
- Comparative Genomics
Background:
- Secreted protein SPLUNC1 (palate, lung, and nasal epithelium clone 1) is homologous to host defense proteins LBP and BPI.
- SPLUNC1 is believed to play a role in the innate immune system, particularly in respiratory tract epithelial cells.
Purpose of the Study:
- To clone and analyze the porcine (Sus scrofa) homologue of SPLUNC1.
- To investigate the expression patterns of the porcine SPLUNC1 homologue.
Main Methods:
- cDNA amplification using reverse transcriptase polymerase chain reaction (RT-PCR).
- In silico sequence analysis.
- Expression analysis via RT-PCR.
Main Results:
- The porcine SPLUNC1 (SsSPLUNC1) cDNA codes for a 249-amino acid protein with high similarity to bovine (74%) and human (69%) SPLUNC1.
- SsSPLUNC1 possesses a putative 19-residue signal peptide, consistent with other PLUNC family members.
- RT-PCR analysis revealed high expression of SsSPLUNC1 exclusively in porcine trachea and lung tissues.
Conclusions:
- The cloned porcine SPLUNC1 homologue exhibits structural and sequence similarities to known SPLUNC1 proteins.
- The airway-specific expression pattern of SsSPLUNC1 highlights its potential significance in porcine respiratory immunity.
- This finding is particularly relevant for studying airborne diseases in pigs.