Cloning, sequencing and analysis of cDNA encoding bovine intercellular adhesion molecule-1 (ICAM-1)

Area of Science:

• Immunology
• Molecular Biology
• Genomics

Background:

• Intercellular adhesion molecule-1 (ICAM-1) is a key glycoprotein mediating leukocyte interactions with integrins.
• Understanding ICAM-1 in cattle is crucial for comparative immunology and animal health research.

Purpose of the Study:

• To isolate and analyze the cDNA sequence of the bovine ICAM-1 gene.
• To compare bovine ICAM-1 with homologous sequences from other species and bovine ICAM-3.
• To investigate the expression patterns of bovine ICAM-1 and ICAM-3.

Main Methods:

• cDNA cloning and sequencing of the bovine ICAM-1 gene.
• Bioinformatic analysis of sequence homology and conserved residues.
• Northern blot analysis for gene expression studies.

Main Results:

• A 3398-bp cDNA sequence for bovine ICAM-1 was identified, encoding 535 amino acids.
• Bovine ICAM-1 shares 57% amino acid homology with human ICAM-1 and 47% with bovine ICAM-3.
• Conserved cysteine residues, two RGD sites, and a cytoplasmic serine were noted in bovine ICAM-1.
• Bovine ICAM-1 is expressed in stimulated leukocytes, while bovine ICAM-3 is predominantly found in resting neutrophils.

Conclusions:

• The bovine ICAM-1 gene possesses conserved structural features across species.
• Distinct expression profiles of bovine ICAM-1 and ICAM-3 suggest specialized roles in immune responses.
• This research contributes to the understanding of bovine immune mechanisms and potential therapeutic targets.