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Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3
Published on: December 27, 2010
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An evaluation of phylogenetic methods for reconstructing transmitted HIV variants using longitudinal clonal HIV
Rosemary M McCloskey1, Richard H Liang, P Richard Harrigan
1BC Centre for Excellence in HIV/AIDS, Vancouver, British Columbia, Canada.
Journal of Virology
|March 21, 2014
Summary
Reconstructing the transmitted/founder human immunodeficiency virus (HIV) strain is challenging due to viral evolution. Phylogenetic methods offer a 16% improvement over other techniques for recovering this ancestral HIV sequence.
Area of Science:
- Virology
- Evolutionary Biology
- Computational Biology
Background:
- Human immunodeficiency virus (HIV) infections typically originate from a single transmitted/founder virus.
- The high mutation rate of HIV and delays in diagnosis complicate the isolation and characterization of the initial viral strain.
- Understanding the transmitted/founder virus is crucial for vaccine development and treatment strategies.
Purpose of the Study:
- To evaluate the accuracy of phylogenetic and phylogeny-naive ancestral reconstruction methods for recovering the transmitted/founder HIV strain.
- To compare the performance of different reconstruction methods using published longitudinal HIV sequence data.
- To identify factors influencing the accuracy of transmitted/founder virus reconstruction.
Main Methods:
- Applied ancestral reconstruction techniques to 19,486 HIV sequences from 19 published datasets.
- Utilized early-sampled sequences (within 6 months of infection) as the best estimate of the transmitted/founder virus.
- Compared phylogenetic methods with phylogeny-naive approaches for reconstructing ancestral sequences.
Main Results:
- Phylogenetic methods showed a 16% improvement in accuracy compared to phylogeny-naive methods for reconstructing the transmitted/founder HIV consensus sequence.
- The advantage of phylogenetic methods increased with viral diversity and the time elapsed between sample collections.
- Neither method accurately reconstructed ancestral insertion/deletion (indel) variations, particularly in indel-rich genomic regions.
Conclusions:
- Phylogenetic methods significantly outperform phylogeny-naive alternatives for reconstructing transmitted/founder HIV sequences.
- While not perfect, ancestral reconstruction provides valuable insights into the genetic makeup of the initial HIV strain.
- Further research and optimized study designs are needed to enhance the accuracy of transmitted/founder virus reconstruction, especially for indel variation.
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