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A generalized mechanistic codon model.

Abstract：

:Models of codon evolution have attracted particular interest because of their unique capabilities to detect selection forces and their high fit when applied to sequence evolution. We described here a novel approach for modeling codon evolution, which is based on Kronecker product of matrices. The 61 × 61 codon substitution rate matrix is created using Kronecker product of three 4 × 4 nucleotide substitution matrices, the equilibrium frequency of codons, and the selection rate parameter. The entities of the nucleotide substitution matrices and selection rate are considered as parameters of the model, which are optimized by maximum likelihood. Our fully mechanistic model allows the instantaneous substitution matrix between codons to be fully estimated with only 19 parameters instead of 3,721, by using the biological interdependence existing between positions within codons. We illustrate the properties of our models using computer simulations and assessed its relevance by comparing the AICc measures of our model and other models of codon evolution on simulations and a large range of empirical data sets. We show that our model fits most biological data better compared with the current codon models. Furthermore, the parameters in our model can be interpreted in a similar way as the exchangeability rates found in empirical codon models.

journal_name

Mol Biol Evol

journal_title

Molecular biology and evolution

authors

Zaheri M,Dib L,Salamin N

doi

10.1093/molbev/msu196

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

2528-41

issue

9

eissn

0737-4038

issn

1537-1719

pii

msu196

journal_volume

31

pub_type

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