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Related Experiment Videos

Naturally occurring sequence polymorphisms within HIV type 1 group O protease.

K C Luk1, L Kaptué, L Zekeng

  • 1AIDS Research and Retrovirus Discovery, Abbott Laboratories, Abbott Park, Illinois 60064, USA.

AIDS Research and Human Retroviruses
|November 16, 2001
PubMed
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HIV-1 group O protease genes show natural polymorphisms, not primary resistance mutations. These secondary mutations may accelerate drug resistance and treatment failure in group O patients.

Area of Science:

  • Virology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Protease inhibitor resistance mutations are documented in HIV-1 group M subtype B.
  • Limited genotypic and phenotypic data exist for HIV-1 group O strains.
  • Preexisting polymorphisms in group O may impact antiviral treatment response.

Purpose of the Study:

  • To identify naturally occurring amino acid polymorphisms associated with drug resistance in the protease gene of protease inhibitor-naive HIV-1 group O.
  • To compare group O protease sequences with subtype B of group M.

Main Methods:

  • Analysis of protease genes from 28 protease inhibitor-naive HIV-1 group O-infected patients.
  • Comparison of consensus group O protease sequence with subtype B of group M.

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Main Results:

  • Group O and subtype B protease sequences are nearly identical in key active site regions.
  • 34% of protease gene positions showed polymorphisms in group O strains, but no primary resistance mutations were found.
  • All group O strains possessed multiple secondary/accessory mutations linked to protease inhibitor resistance in group M.

Conclusions:

  • Naturally occurring polymorphisms in HIV-1 group O protease genes do not include primary resistance mutations.
  • The presence of multiple secondary resistance-associated mutations in group O may facilitate rapid development of drug resistance phenotypes.
  • These findings suggest a potential for faster treatment failure in group O-infected patients.