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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Human Immunotypes Impose Selection on Viral Genotypes Through Viral Epitope Specificity.

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Investigating human and HIV genetics reveals interactions affecting viral load. Understanding this interplay is key for interpreting virulence factors and developing targeted therapies.

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Area of Science:

  • Genetics
  • Immunology
  • Virology

Background:

  • Understanding host-pathogen genetic interactions is vital for interpreting virulence factors.
  • This study examines the genetic interplay between human hosts and human immunodeficiency virus (HIV).

Purpose of the Study:

  • To test for associations between HIV and host genetics.
  • To investigate interactive genetic effects on viral load (VL) in HIV-positive, antiretroviral treatment-naive individuals.

Main Methods:

  • Sequencing of HIV genomes to identify amino acid (AA) variants.
  • Association analysis of HIV variants, human single nucleotide polymorphisms (SNPs), and HLA alleles with VL using generalized linear models and Bonferroni correction.

Main Results:

  • Four HIV variants were significantly associated with VL.
  • Twelve HIV variants showed associations with human SNPs, and 46 associations were found between HLA alleles and HIV variants.
  • While HIV variants and immunotypes individually correlated with lower VL, their combined analysis showed an opposite effect, supported by epitope binding predictions.

Conclusions:

  • The findings highlight the importance of immunotype specificity on viral antigenic determinants.
  • The identified genetic interplay underscores the necessity of studying viral and human genetics concurrently.