Abstract
Killer-cell immunoglobulin-like receptors (KIRs) are a structurally and functionally diverse family of molecules expressed by natural killer (NK) cells and T-cell subsets. The most centromeric gene in the human KIR cluster is KIR3DL3, a framework gene that is present in all haplotypes. KIR3DL3 has only one immunoreceptor tyrosine-based inhibitory motif and lacks the exon encoding the stem between the Immunoglobulin domains and the transmembrane region. We have investigated expression of KIR3DL3 in blood and decidual NK cells by reverse transcriptase polymerase chain reaction (RT-PCR) and protein analysis using a KIR3DL3-specific monoclonal antibody, CH21. KIR3DL3 mRNA was only detected in the CD56bright subset in cells from peripheral blood and in CD56bright decidual NK cells. The CD56bright NK92 cell line was also positive. Quantitative RT-PCR indicated a trend for higher expression of KIR3DL3 in female peripheral blood mononuclear cells compared to that in male. Using a bisulphite conversion method, we found that the promoter of KIR3DL3 was strongly methylated. Surface protein expression was detectable after demethylation. Like other KIRs, KIR3DL3 is highly polymorphic, and we detected 14 variants in 25 unrelated individuals. Nucleotide substitutions were scattered throughout the sequence, with a cluster of alleles at the start of the transmembrane region at the site where the remnant of the linking stem present in other KIR is found. We conclude that the KIR3DL3 gene is not a pseudogene but encodes a protein that is not expressed in healthy individuals. Protein expression might be induced under certain developmental or pathological situations.
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Acknowledgements
We would like to thank Jacquie Northfield and Nigel Miller for technical assistance, Paul Norman for helpful advice and Jenny Connor for typing the manuscript. This study was funded by National Institutes of Health RO1-HD39670-01, British Heart Foundation, Wellcome Trust and the Isaac Newton Trust. The experiments performed during this study comply with current British laws.
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Trundley, A.E., Hiby, S.E., Chang, C. et al. Molecular characterization of KIR3DL3. Immunogenetics 57, 904–916 (2006). https://doi.org/10.1007/s00251-005-0060-7
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DOI: https://doi.org/10.1007/s00251-005-0060-7