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KIR Variation in Iranians Combines High Haplotype and Allotype Diversity With an Abundance of Functional Inhibitory Receptors. | LitMetric

AI Article Synopsis

Article Abstract

Natural killer (NK) cells are innate lymphocytes that eliminate infected and transformed cells. They discriminate healthy from diseased tissue through killer cell Ig-like receptor (KIR) recognition of HLA class I ligands. Directly impacting NK cell function, polymorphism associates with infection control and multiple autoimmune and pregnancy syndromes. Here we analyze diversity of 241 individuals from five groups of Iranians. These five populations represent Baloch, Kurd, and Lur, together comprising 15% of the ethnically diverse Iranian population. We identified 159 alleles, including 11 not previously characterized. We also identified 170 centromeric and 94 telomeric haplotypes, and 15 different haplotypes carrying either a deletion or duplication encompassing one or more complete genes. As expected, comparing our data with those representing major worldwide populations revealed the greatest similarity between Iranians and Europeans. Despite this similarity we observed higher frequencies of in Iran than any other population, and the highest frequency of HLA-B51, a Bw4-containing allotype that acts as a strong educator of NK cells. Compared to Europeans, the Iranians we studied also have a reduced frequency of , which encodes an allotype that is not expressed at the NK cell surface. Concurrent with the resulting high frequency of strong viable interactions between inhibitory KIR and polymorphic HLA class I, the majority of haplotypes characterized do not express a functional activating receptor. By contrast, the most frequent haplotype in Iran expresses only one functional inhibitory KIR and the maximum number of activating KIR. This first complete, high-resolution, characterization of the locus of Iranians will form a valuable reference for future clinical and population studies.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7142237PMC
http://dx.doi.org/10.3389/fimmu.2020.00556DOI Listing

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