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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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HIV-1 subtype A gag variability and epitope evolution.

Syed Hani Abidi1, Marcia L Kalish2, Farhat Abbas3

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This summary is machine-generated.

The human immunodeficiency virus type 1 (HIV-1) subtype A epidemic

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Area of Science:

  • Virology
  • Epidemiology
  • Immunology

Background:

  • HIV-1 subtype A is a major global epidemic strain.
  • Understanding its evolutionary dynamics is crucial for effective control strategies.

Purpose of the Study:

  • To investigate the global, time-dependent evolution of HIV-1 subtype A.
  • To analyze the dynamics of immunogenic HIV gag epitopes during the epidemic's spread.

Main Methods:

  • Phylogenetic analysis of 1,893 HIV-1 subtype A gag sequences (1985-2010) from 19 countries.
  • Assessment of genomic variability (G→A substitutions, Shannon entropy) and epitope evolution.
  • Analysis of cohort-specific gag epitope variability and HLA restriction profiles.

Main Results:

  • The HIV-1 subtype A epidemic's common ancestor was estimated at 1956.
  • Genomic variability and novel gag epitopes increased, peaking between 2005-2010.
  • Epidemic growth showed periods of exponential increase, stabilization, and decline.

Conclusions:

  • Global spread of HIV-1 subtype A appears influenced by changing population immunogenetic pressures.
  • Genomic variability and epitope diversity reflect immune-driven evolution of HIV-1 subtype A.