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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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CR3 complement receptor: cloning and characterization in rainbow trout.

Angeliki Mikrou¹, Dimitra Marioli, Anastasios D Papanastasiou

¹Department of Biology, School of Medicine, University of Patras, Patras, Greece.

Fish & Shellfish Immunology

|November 11, 2008

Summary

Researchers cloned and characterized the beta 2 integrin CR3 receptor subunits (CD18 and CD11b) in rainbow trout. This study provides insights into the molecular evolution of this important immune molecule in fish.

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Area of Science:

Immunology
Molecular Biology
Evolutionary Biology

Background:

The beta 2 integrin CR3 (CD11b/CD18) is a key leukocyte adhesion molecule involved in immune responses.
Understanding the evolutionary history of CR3 provides insights into vertebrate immunity.

Purpose of the Study:

To clone and characterize the CD18 and CD11b subunits of the CR3 receptor in rainbow trout (Oncorhynchus mykiss).
To investigate the molecular evolution and tissue expression of CR3 in a lower vertebrate model.

Main Methods:

Cloning and sequencing of rainbow trout CD18 and CD11b genes.
Bioinformatic analysis of predicted protein sequences and domain architecture.
Quantitative analysis of tissue-specific mRNA expression.

Main Results:

The study successfully cloned and characterized rainbow trout CD18 and CD11b subunits.
Trout CR3 subunits share conserved domains with mammalian orthologs but exhibit distinct sequence identities.
Tissue expression analysis revealed the kidney as the primary site for CR3 subunit mRNA in trout, differing from mammals.

Conclusions:

This is the first report detailing the CR3 receptor subunits in a lower vertebrate.
The findings suggest conserved structural features but divergent expression patterns of CR3 during vertebrate evolution.
This research contributes to understanding the evolution of the innate immune system in fish.