Molecular cloning, expression pattern and chromosomal mapping of pig CD9 antigen

Area of Science:

• Molecular Biology
• Genetics
• Immunology

Background:

• CD9 is a transmembrane-4 superfamily protein involved in cell migration, adhesion, and cancer progression.
• Understanding CD9's role requires characterizing its molecular structure and genetic location.

Purpose of the Study:

• To isolate and characterize the cDNA for the porcine CD9 molecule.
• To determine the genetic location of the pig CD9 gene.
• To analyze the expression pattern of CD9 mRNA in porcine tissues.

Main Methods:

• CD9 cDNA isolation from a porcine smooth muscle library.
• Bioinformatic analysis of the deduced amino acid sequence.
• Gene localization using a somatic cell hybrid panel.
• Quantitative analysis of CD9 mRNA expression.

Main Results:

• Isolated a 678-bp open reading frame for pig CD9, predicting a 226-amino acid polypeptide.
• The deduced sequence shares characteristics with TM4 proteins, including four transmembrane domains and two extracellular regions.
• Pig CD9 gene localized to chromosome 5q25.
• CD9 mRNA demonstrated ubiquitous expression across various porcine cells and tissues.

Conclusions:

• The characterization of porcine CD9 provides a molecular basis for studying its function in pigs.
• Ubiquitous expression suggests a fundamental role for CD9 in normal porcine physiology.
• This study contributes to comparative genomics and understanding of CD9 evolution.