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Human and Rhesus Macaque KIR Haplotypes Defined by Their Transcriptomes.

Jesse Bruijnesteijn1, Marit K H van der Wiel1, Wendy T N Swelsen2

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This study introduces a new sequencing method to analyze killer-cell Ig-like receptors (KIRs) in humans and macaques. The advanced technique accurately maps KIR gene variations and haplotypes, improving disease association studies.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Genomics

Background:

  • Killer-cell Ig-like receptors (KIRs) are crucial for immune responses, interacting with MHC class I molecules in infection, pregnancy, and transplantation.
  • KIR genes exhibit significant copy number variation and polymorphism, making complete haplotype characterization difficult with traditional methods.
  • Previous analyses often used genomic DNA, missing crucial transcriptional information and lacking high resolution for complex KIR regions.

Purpose of the Study:

  • To present a novel single-molecule real-time (SMRT) sequencing approach for characterizing KIR transcriptomes.
  • To apply this method to human and rhesus macaque families for high-resolution KIR haplotype analysis.
  • To identify novel alleles, recombinant genes, and understand the structural dynamics of the KIR cluster.

Main Methods:

  • Utilized Pacific Biosciences Sequel platform for single-molecule real-time (SMRT) sequencing.
  • Analyzed KIR transcriptomes in human and rhesus macaque (Macaca mulatta) families.
  • Focused on high-resolution characterization of the KIR gene cluster.

Main Results:

  • Identified novel Mamu-KIR alleles and extended known allele sequences in rhesus macaques.
  • Determined complete human and macaque KIR haplotypes with unprecedented resolution.
  • Discovered multiple recombinant KIR genes on contracted haplotypes, suggesting chromosomal rearrangements and potential selection.

Conclusions:

  • SMRT sequencing offers a superior method for high-resolution KIR transcriptome characterization in diverse species.
  • The findings provide a deeper understanding of KIR diversity, including novel alleles and recombinant genes.
  • This advanced approach can aid in interpreting KIR-associated diseases and immune responses in transplantation and reproduction.