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Related Experiment Videos

HIV susceptibility to amprenavir: phenotype-based versus rules-based interpretations.

Luigia Scudeller1, Carlo Torti, Eugenia Quiros-Roldan

  • 1Institute of Infectious Diseases, University of Udine, Udine.

The Journal of Antimicrobial Chemotherapy
|October 18, 2003
PubMed
Summary

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Discordance in interpreting HIV drug resistance is common. The I84V mutation and multiple protease inhibitor mutations are key indicators of amprenavir resistance, though some mutations may be missed by current algorithms.

Area of Science:

  • HIV drug resistance research
  • Virology
  • Molecular epidemiology

Background:

  • Accurate interpretation of HIV resistance mutations is crucial for effective antiretroviral therapy.
  • Discrepancies between genotypic and phenotypic resistance testing can impact treatment decisions.

Purpose of the Study:

  • To investigate genetic factors associated with differing interpretations of amprenavir (APV) resistance.
  • To compare a rules-based algorithm (VGI-TRUGENE) with phenotypic methods (recombinant and virtual phenotypes).

Main Methods:

  • Genotypic data from 180 HIV-infected patients in the GenPheRex study were analyzed.
  • Resistance mutations were interpreted using VGI-TRUGENE and compared with recombinant (r-PHT) and virtual (v-PHT) phenotypes.

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Main Results:

  • A high rate of discordance (31.1%) was observed between genotypic and phenotypic interpretations.
  • The I84V mutation was strongly associated with concordant resistance (P < 0.0001).
  • Accumulation of >3 protease inhibitor-associated mutations (PAMs) was significantly higher in resistant isolates (P = 0.01).

Conclusions:

  • High discordance rates highlight challenges in interpreting APV resistance.
  • I84V mutation and >3 PAMs are reliable markers for APV resistance.
  • Further research is needed to identify mutations missed by current interpretation algorithms.