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A Scalable Framework for Comprehensive Typing of Polymorphic Immune Genes from Long-Read Data.

Shuai Wang1,2,3, Xuedong Wang2, Mengyao Wang2,4

  • 1City University of Hong Kong Shenzhen Research Institute, Shenzhen, China.

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Summary
This summary is machine-generated.

SpecImmune is a new tool for long-read sequencing that accurately genotypes immune and drug metabolism genes. It improves HLA typing and reveals population-specific genetic diversity, advancing precision medicine.

Keywords:
complex gene typingco‐evolutiongene sequence reconstructionimmunitylong‐read sequencing

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Area of Science:

  • Genomics
  • Immunogenetics
  • Computational Biology

Background:

  • Long-read sequencing offers potential for complex immune gene analysis, but current tools lack accuracy and scope.
  • Polymorphic genes like HLA, KIR, IG, and TCR, along with CYP genes, are crucial for immunity and drug response.
  • Accurate genotyping of these genes is essential for advancing immunology and precision medicine.

Purpose of the Study:

  • To introduce SpecImmune, the first unified computational framework for simultaneous genotyping of immune (HLA, KIR, IG, TCR) and CYP genes using long-read sequencing data.
  • To achieve high-accuracy diploid assemblies and genotyping for these complex gene families.
  • To explore population genetics and gene co-evolution using the developed framework.

Main Methods:

  • Development of an iterative graph-based haplotype reconstruction algorithm.
  • Application of SpecImmune to diverse long-read datasets (ONT, PacBio CLR, PacBio HiFi) from multiple cohorts (1kGP, HGSVC, HPRC).
  • Validation of genotyping accuracy, particularly for four-field HLA typing, and comparison with existing tools.

Main Results:

  • SpecImmune achieved 98% four-field HLA typing accuracy, outperforming existing tools (HLA*LA by 11%, SpecHLA by 12%).
  • Robust genotyping of KIR, germline IG/TCR, and multi-locus CYP alleles was demonstrated.
  • Uncovered significantly elevated germline IG/TCR heterozygosity in African populations and suggested cross-family co-evolution patterns.

Conclusions:

  • SpecImmune is a powerful, integrated long-read solution for comprehensive immune and CYP gene genotyping.
  • The tool enables allele-specific drug dosing recommendations and facilitates new locus customization.
  • Findings advance understanding in immunology, precision medicine, and evolutionary genomics, highlighting population-specific genetic variations.