Document Detail


Differential selection in HIV-1 gp120 between subtype B and East Asian variant B'
MedLine Citation:
PMID:  24452536     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
HIV-1 evolves strongly and undergoes geographic differentiation as it spreads in diverse host populations around the world. For instance, distinct genomic backgrounds can be observed between the pandemic subtype B, prevalent in Europe and North-America, and its offspring clade B' in East Asia. Here we ask whether this differentiation affects the selection pressure experienced by the virus. To answer this question we evaluate selection pressure on the HIV-1 envelope protein gp120 at the level of individual codons using a simple and fast estimation method based on the ratio k a /k s of amino acid changes to synonymous changes. To validate the approach we compare results to those from a state-of-the-art mixed-effect method. The agreement is acceptable, but the analysis also demonstrates some limitations of the simpler approach. Further, we find similar distributions of codons under stabilizing and directional selection pressure in gp120 for subtypes B and B' with more directional selection pressure in variable loops and more stabilizing selection in the constant regions. Focusing on codons with increased k a /k s values in B', we show that these codons are scattered over the whole of gp120, with remarkable clusters of higher density in regions flanking the variable loops. We identify a significant statistical association of glycosylation sites and codons with increased k a /k s values.
Authors:
Stefan Dang; Yan Wang; Bettina Budeus; Jens Verheyen; Rongge Yang; Daniel Hoffmann
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-1-16
Journal Detail:
Title:  Virologica Sinica     Volume:  -     ISSN:  1995-820X     ISO Abbreviation:  Virol Sin     Publication Date:  2014 Jan 
Date Detail:
Created Date:  2014-1-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101514185     Medline TA:  Virol Sin     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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