title: Site-specific amino acid frequency, fitness and the mutational landscape model of adaptation in human immunodeficiency virus type 1.
abstract: Analysis of the intensely studied HIV-1 gp120 V3 protein region reveals that the among-population mean site-specific frequency of an amino acid is a measure of its relative marginal fitness. This surprising result may arise if populations are displaced from mutation-selection equilibrium by fluctuating selection and if the probability of fixation of a beneficial amino acid is proportional to its selection coefficient.
authors.affiliation: School of Molecular and Biomedical Science, University of Adelaide, Adelaide, SA 5005, Australia. jack.dasilva@adelaide.edu.au
authors.forename: Jack
authors.initials: J
authors.lastname: da Silva
mesh_terms: D000064:Acclimatization; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D000596:Amino Acids / Q000235:genetics*; D030541:Databases, Genetic; D015699:HIV Envelope Protein gp120 / Q000235:genetics / Q000378:metabolism; D015497:HIV-1 / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D008954:Models, Biological; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D019713:Receptors, CCR5 / Q000378:metabolism; D019718:Receptors, CXCR4 / Q000378:metabolism; D012641:Selection, Genetic; D017386:Sequence Homology, Amino Acid
chemical_list: D000596:Amino Acids; D015699:HIV Envelope Protein gp120; D019713:Receptors, CCR5; D019718:Receptors, CXCR4