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Related Experiment Video

Updated: Feb 5, 2026

Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis
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Polymorphism of duck MHC class molecules.

Lin Zhang1, Dongmei Lin2, Sen Yu3

  • 1Shandong Key Laboratory of Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Science, No. 8, Sangyuan Road, Jinan, Shandong, China. lzhang3406@163.com.

Immunogenetics
|September 7, 2018
PubMed
Summary

We analyzed Major Histocompatibility Complex class I (MHC I) gene polymorphism in Chinese duck breeds, identifying novel alleles. This enhances understanding of duck immune responses and aids vaccine development against infections.

Keywords:
Allelic groupDuckMajor histocompatibility class IPeptidePolymorphism

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Area of Science:

  • Immunogenetics
  • Comparative Genomics
  • Avian Biology

Background:

  • Major Histocompatibility Complex class I (MHC I) molecules are crucial for pathogen defense and exhibit high polymorphism.
  • Ducks (Anas platyrhynchos) show biased expression of one MHC I gene, making their polymorphism particularly important for immune responses.

Purpose of the Study:

  • To investigate the polymorphism of MHC I genes in two Chinese duck breeds: Shaoxing (SX) and Jinding (JD).
  • To analyze the amino acid composition, homology, and phylogenetic relationships of identified MHC I alleles.
  • To identify novel MHC I allele groups and understand their distribution and potential impact on peptide binding.

Main Methods:

  • Sequencing and analysis of MHC I genes from SX and JD duck breeds.
  • Amino acid sequence homology and phylogenetic analyses to establish allelic groups.
  • Identification and localization of highly variable sites (HVSs) within the peptide-binding domains (PBD) and 3D structure.

Main Results:

  • Twenty-seven unique UAA alleles were identified, showing high polymorphism based on full-length sequence homology.
  • Seventeen established groups of Anas platyrhynchos MHC I (Anpl-MHC I) were identified, with four novel groups found in SX and JD ducks.
  • Highly variable sites were predominantly located in the peptide-binding groove (PBG), suggesting a role in peptide binding specificity.

Conclusions:

  • The study significantly enriches the data on Anpl-MHC I polymorphism and clarifies allele distribution.
  • The findings suggest that MHC I HVSs in the PBG influence peptide presentation and recognition in ducks.
  • This research provides a foundation for developing effective vaccines and controlling infections in ducks.