Document Detail

Estimating synonymous and nonsynonymous substitution rates.
MedLine Citation:
PMID:  8583885     Owner:  NLM     Status:  MEDLINE    
Partitioning the total substitution rate into synnonymous and nonsynonymous components is a key aspect of many analyses in molecular evolution. Numerous methods exist for estimating these rates. However, until recently none of the estimation procedures were based on a sound statistical footing. In this paper, the evolutionary model of Muse and Gaut (1994) is used as the basis for two sets of parameters quantifying silent and replacement substitution rates. The parameters are shown to be equal when the four nucleotides are equally frequent and unequal otherwise. Maximum-likelihood estimation of these parameters is described, and the performance of these estimates is compared to that of existing estimation procedures. It is shown that the estimates of Nei and Gojobori (1986) are not unbiased for either set of parameters, although they provide very good estimates for one set as long as sequence divergence is not too high. However, some disturbing properties are found for the Nei and Gojobori estimates. In particular, it is shown that the expected value of the Nei and Gojobori estimate of silent substitution rate is a function of both the silent and replacement substitution rates. The maximum-likelihood estimates have no such problems.
S V Muse
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Molecular biology and evolution     Volume:  13     ISSN:  0737-4038     ISO Abbreviation:  Mol. Biol. Evol.     Publication Date:  1996 Jan 
Date Detail:
Created Date:  1996-03-20     Completed Date:  1996-03-20     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8501455     Medline TA:  Mol Biol Evol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  105-14     Citation Subset:  IM    
Department of Biology, Pennsylvania State University, University Park 16802, USA.
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MeSH Terms
Computer Simulation
Evolution, Molecular*
Models, Theoretical*
Molecular Sequence Data
Grant Support

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