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Updated: May 9, 2026
10:18
Amplification of Near Full-length HIV-1 Proviruses for Next-Generation Sequencing
Published on: October 16, 2018
Synonymous site conservation in the HIV-1 genome
Itay Mayrose1, Adi Stern, Ela O Burdelova
1Department of Molecular Biology and Ecology of Plants, Tel Aviv University, Tel-Aviv 69978, Israel. itaymay@post.tau.ac.il
BMC Evolutionary Biology
|August 7, 2013
Summary
Silent mutations in HIV-1 genomes can be evolutionarily conserved due to functional constraints beyond protein sequences. However, these conserved sites did not impact viral fitness in cell culture assays.
Area of Science:
- Genomics
- Evolutionary Biology
- Virology
Background:
- Silent mutations, previously considered neutral, can impact RNA structure and regulatory elements.
- The compact HIV-1 genome exhibits overlapping functional elements, suggesting complex evolutionary pressures.
- This study hypothesizes that synonymous conservation is common in the HIV-1 genome due to these constraints.
Purpose of the Study:
- To identify and characterize regions of synonymous conservation in the HIV-1 genome.
- To investigate the functional significance of these conserved regions.
Main Methods:
- Employed a computational-experimental approach using probabilistic evolutionary models.
- Accounted for synonymous rate variation and dependencies between adjacent sites.
- Utilized a randomization procedure to identify statistically significant conserved regions.
Main Results:
- Identified 21 conserved regions, with 12 in overlapping genes and 7 linked to known functional elements.
- Four regions with unknown functions were further investigated.
- Synonymous mutations in one selected region did not affect viral fitness in single-cycle assays.
Conclusions:
- Inferred purifying selection on synonymous sites contrasts with observed lack of phenotypic effect.
- The discrepancy may stem from using single-cycle cell culture assays, which don't fully represent in vivo HIV-1 infection dynamics.
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