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Novel immune-type receptor genes.

G W Litman¹, N A Hawke, J A Yoder

¹University of South Florida/All Children's Hospital, Children's Research Institute, St Petersburg 33701, USA. litmang@allkids.org

Immunological Reviews

|August 22, 2001

Summary

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Novel immune-type receptors (NITRs) in fish share structural similarities with immunoglobulin and T-cell receptors. These findings suggest NITRs represent a key evolutionary step in immune system development.

Area of Science:

Immunology
Evolutionary Biology
Genetics

Background:

Novel immune-type receptor (NITR) genes were first identified in Southern pufferfish.
NITRs encode proteins with extracellular domains, a transmembrane region, and a cytoplasmic tail, often containing an immunoreceptor tyrosine-based inhibition motif (ITIM).
Multiple NITR genes are found linked on chromosomes.

Purpose of the Study:

To investigate the structural characteristics and evolutionary significance of NITRs in bony fish.
To compare NITR gene structures across different fish species.
To understand the role of NITRs in the evolution of immune function.

Main Methods:

Identification and characterization of NITR genes in various bony fish species.
Comparative sequence analysis of NITR gene families.

Related Experiment Videos

Examination of exon-exon interactions and potential exon shuffling events.

Main Results:

NITR V regions show resemblance to immunoglobulin (Ig) and T-cell receptor (TCR) V regions.
Exon shuffling appears to have contributed to the diversification of the NITR gene complex.
Zebrafish NITRs share key characteristics with pufferfish NITRs.
Variations in extracellular domains, charged residues, and ITIM presence were observed in NITRs from different fish species.

Conclusions:

NITRs possess structural features analogous to Ig and TCR, including V regions.
The presence of regulatory motifs suggests NITRs are immune inhibitory receptors.
NITRs represent a significant evolutionary stage in the development of innate and adaptive immunity.