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Related Concept Videos

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Related Experiment Video

Updated: Sep 28, 2025

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
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Recombination and mutation shape variations in the major histocompatibility complex.

Yuying Sun1, Fang Yuan2, Ling Wang1

  • 1Department of Immunology and National Immunoassay Laboratory, Fifth Medical Center of Chinese PLA General Hospital, Beijing 100071, China; Institute of Beijing 307 Hospital, Anhui Medical University, Hefei, Anhui 230032, China.

Journal of Genetics and Genomics = Yi Chuan Xue Bao
|March 31, 2022
PubMed
Summary
This summary is machine-generated.

The study reveals that recombination and de novo mutations drive major histocompatibility complex (MHC) diversity, with higher mutation rates in recombinant individuals. This enhances understanding of MHC evolution and disease variant identification.

Keywords:
De novo mutationDisease-associated genetic variantsMajor histocompatibility complex (MHC)Positive selectionRecombination

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Area of Science:

  • Genetics
  • Human Evolution
  • Genomic Instability

Background:

  • The Major Histocompatibility Complex (MHC) is crucial for immunity and disease association, but its high polymorphism hinders variant discovery.
  • Recombination and de novo mutations are hypothesized drivers of MHC polymorphism, yet direct evidence is limited.

Purpose of the Study:

  • To generate fine-scale maps of MHC recombination and de novo mutation rates.
  • To investigate the relationship between recombination, mutation, and MHC diversity in Han Chinese populations.
  • To understand the evolutionary forces shaping MHC locus diversity.

Main Methods:

  • Deep sequencing (>100×) of the MHC region (∼5 Mb) in 190 individuals from 47 Han Chinese families.
  • Analysis of recombination hotspots and de novo mutation rates.
  • Comparison of MHC de novo mutation rates with genome-wide rates.

Main Results:

  • Fine-scale maps of MHC recombination and de novo mutations were generated.
  • Recombination hotspots and Han-specific breakpoints were found near haplotype block boundaries.
  • The average MHC de novo mutation rate exceeds the genome-wide rate, especially in recombinant individuals.
  • Polymorphisms arose within and outside MHC linkage disequilibrium regions.
  • Positive selection was identified as a primary driver of MHC evolution.

Conclusions:

  • Recombination and de novo mutations are key contributors to MHC polymorphism and diversity.
  • The MHC exhibits a higher mutation rate than the genome average, influenced by recombination.
  • MHC evolution is largely shaped by positive selection, providing insights into disease associations.