Immunogenetics

, Volume 55, Issue 3, pp 165–171 | Cite as

DNA sequence variation and molecular genotyping of natural killer leukocyte immunoglobulin-like receptor, LILRA3

  • Paul J. Norman
  • B. Sean Carey
  • Henry A. F. Stephens
  • Robert W. Vaughan
Original Paper

Abstract.

Leukocyte immunoglobulin-like receptors (LILRs) resemble killer cell immunoglobulin-like receptors (KIR) in structure and function and the KIR and LILR gene families form the major part of the leukocyte receptor cluster (LRC) of human chromosome 19q13.4. Unlike KIR, the LILR gene clusters do not vary in gene number. However, some individuals lack expression of LILRA3. This null allele has a 6.7-kb deletion, which encompasses the first six translated exons. This haplotype enabled unambiguous direct sequencing of LILRA3 alleles using genomic DNA from individuals heterozygous for the deletion. We have performed nucleotide sequencing of a 2.5-kb region within LILRA3 and identified eight bi-allelic substitutions, four of which were non-synonymous. Two from four previously identified LILRA3 cDNA sequences were confirmed and a further six alleles characterised, of which four will encode unique peptides. At least one of the polymorphic positions identified (encoding residue 84 of the first Ig domain) is likely to directly influence ligand binding. A PCR-SSP molecular genotyping system was developed and used to describe a panel of 172 Caucasoid individuals from South-East England. Six alleles were present in this group but they were unevenly distributed, as three alleles accounted for 88% of the studied chromosomes.

Keywords

Leukocyte receptor cluster Immunoglobulin-like receptors Sequence analysis Single nucleotide polymorphism 

Notes

Acknowledgements.

Many thanks to Robert Collins for expert technical advice. Thanks also to Phil Cunningham and Cordelia Smith for constructive suggestions. The work here was performed in accordance with all appropriate regulations.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Paul J. Norman
    • 1
  • B. Sean Carey
    • 2
  • Henry A. F. Stephens
    • 2
  • Robert W. Vaughan
    • 1
  1. 1.Clinical Transplantation LaboratoryGuy's HospitalLondonUK
  2. 2.Institute of Urology and NephrologyUniversity College Hospital Medical SchoolLondonUK

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